Health
Free health calculators: BMI, body fat percentage, calorie needs, heart rate zones, blood pressure risk, ideal weight, and more.
Burn Area Calculator (Rule of Nines)
Estimate total body surface area burned using the Rule of Nines. Enter the percentage of each body region burned to get TBSA and severity classification.
Chemotherapy BSA Dose Calculator
Convert a body-surface-area-based dose (mg/m²) into a total milligram dose. Computes BSA using Mosteller, DuBois, or Haycock formulas from height and weight.
Contraction Frequency Timer
Count events within a sliding time window. Tap to record events and see how many fall inside the last 10, 30, and 60 minutes — useful for trend tracking.
Contraction Timer
Track timed events with a tap-based interval timer. Records start times, durations between events, and computes the running average gap and frequency.
Coronary Heart Disease Risk Calculator
Estimate 10-year coronary heart disease risk using the Framingham ATP III point score. Based on age, sex, cholesterol, blood pressure, smoking, and diabetes status.
Dead Space Calculator
Calculate pulmonary dead space using the Bohr equation. Enter arterial CO2, mixed expired CO2, and tidal volume to find the dead space fraction and volume.
Ejection Fraction Calculator
Calculate cardiac ejection fraction from end-diastolic and end-systolic volumes. Shows stroke volume, cardiac output, and clinical classification from normal to severely reduced.
First-Trimester Risk Calculator (Maternal Age + NT)
Estimate first-trimester risk from maternal age and nuchal translucency measurement. Combines age-based background risk with NT-derived likelihood ratio.
Glasgow Coma Scale Calculator
Score the Glasgow Coma Scale from eye, verbal, and motor responses. Get the total GCS score and severity classification from mild TBI to deep coma.
Menstrual Cycle Phase Calculator
Map menstrual cycle phases based on cycle length and last period date. Predicts ovulation day, next period start, and the current phase: menstruation, follicular, ovulation, or luteal.
Modified Fisher Scale Calculator
Grade subarachnoid hemorrhage on the Modified Fisher Scale. Enter CT findings to get the grade and estimated vasospasm risk after aneurysmal SAH.
MRSA Risk Score Calculator
Estimate MRSA colonization or infection risk using common community and healthcare-exposure factors. Adds known risk markers into a simple total score.
Neonatal Assessment Calculator
Calculate key neonatal metrics: APGAR score from five clinical signs, estimated gestational age from last menstrual period, and birth weight percentile for gestational age.
Neonatal Bilirubin Calculator
Check neonatal bilirubin levels against AAP phototherapy thresholds by gestational age, postnatal age, and neurotoxicity risk factors. For infants 35 weeks gestation or older.
OHSS Risk Score Calculator
Estimate ovarian hyperstimulation syndrome risk during IVF stimulation. Combines patient factors and ovarian reserve markers into an aggregate risk score.
Palliative Performance Scale (PPS) Calculator
Score patient functional status using the Palliative Performance Scale. Pick the level (10-100) that best matches and see the criteria across five domains.
Pediatric Weight-Based Dose Calculator
Convert a weight-based prescription (mg/kg) into a per-dose and daily total in milligrams. Includes maximum dose capping and total course quantity.
Sepsis Calculator (qSOFA Score)
Screen for sepsis using the qSOFA score. Rate respiratory rate, altered mental status, and systolic blood pressure to flag patients at risk for organ failure.
Stroke Risk Calculator (ABCD2 Score)
Calculate stroke risk after a TIA using the ABCD2 score. Enter age, blood pressure, clinical features, duration, and diabetes status to get the 2-day and 7-day risk.
Surgery Risk Calculator (Revised Cardiac Risk Index)
Estimate cardiac risk before non-cardiac surgery using the Revised Cardiac Risk Index. Six clinical predictors give a risk class for major adverse events.
WHO Weight-for-Age Z-Score Calculator
Compute a child's weight-for-age Z-score and percentile using WHO growth standards. Enter age (0-60 months), sex, and weight to assess growth status.
Chicken Breast Calorie Calculator
Calculate the calories and protein in a chicken breast by weight and cooking method. Covers grilled, baked, fried, poached, and pan-seared chicken.
Circadian Rhythm Sleep Calculator
Find ideal sleep and wake times based on 90-minute sleep cycles. Enter your target wake time to see the best bedtimes that align with your natural sleep rhythm.
Cold Plunge Duration Calculator
Find safe cold water immersion time at any temperature. Based on cold stress research protocols for therapeutic cold plunge and ice bath sessions.
Harris-Benedict BMR Calculator
Calculate basal metabolic rate using the Harris-Benedict equation. Enter sex, age, weight, and height to estimate daily calorie needs at rest and with activity.
HRV Score Interpretation Guide
Interpret your HRV score by age and fitness level. Understand what heart rate variability means for recovery, stress, and training readiness.
Karvonen Heart Rate Calculator
Calculate target heart rate training zones using the Karvonen formula. Enter age and resting heart rate to find your personalized intensity zones for exercise.
Metabolic Equivalent (MET) Calculator
Calculate calories burned by any physical activity using MET values. Enter your weight, choose an activity, and set the duration to estimate energy expenditure.
Nurse-to-Patient Ratio Calculator
Calculate nurse-to-patient ratios and compare to safe staffing guidelines. Enter total patients and nurses on shift to see the ratio by hospital unit type.
Nutrition Label Calculator
Build a nutrition label from macronutrient grams. Enter protein, carbs, fat, fiber, sugar, and sodium to calculate total calories and FDA percent daily values.
Optimal Sleep Temperature Calculator
Find the optimal bedroom temperature for quality sleep based on age and personal preference. Covers circadian biology and seasonal adjustment tips.
Plasma Osmolality Calculator
Calculate plasma osmolality from sodium, glucose, and BUN levels using the standard clinical formula. Assess fluid balance and detect electrolyte abnormalities.
Post-Workout Protein Timing Calculator
Calculate optimal post-workout protein per meal and daily total from body weight. Covers timing window, protein per session, and hypertrophy targets.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on IOM guidelines. Enter pre-pregnancy BMI, current weight, and gestational age to track your progress.
Protein in Chicken Calculator
Calculate the protein content of a chicken breast by weight and cooking method. Covers grilled, baked, fried, poached, and raw chicken breast.
Red Light Therapy Dose Calculator
Calculate red light therapy dose in joules per cm2 from irradiance and session time. Includes therapeutic dose ranges for surface and deep tissue treatment.
Sauna Session Planner
Plan sauna session length by temperature for dry Finnish, steam, and infrared saunas. Includes heart rate guidance and beginner versus advanced time limits.
Shrimp Calorie Calculator
Shrimp calorie and macro calculator by preparation method and serving size. Covers boiled, grilled, scampi, fried, tempura, cocktail, and coconut shrimp.
Smoking Risk Calculator
Calculate your pack-year smoking history and assess long-term health risk. Enter cigarettes per day and years of smoking to find your cumulative exposure score.
Sun Safety Calculator
Calculate how long you can stay in the sun before burning. Enter UV index, skin type, and SPF to get your estimated safe sun exposure time in minutes.
Urine Specific Gravity Calculator
Interpret urine specific gravity to assess hydration and kidney function. Enter your USG reading to see what it means and how to adjust your fluid intake.
Alcohol Habit Annual Cost Calculator
Calculate yearly alcohol spending from drinks per week, average price per drink, and bar vs home consumption. See 5 and 10 year totals.
Body Adiposity Index (BAI) Calculator
Estimate body fat percent from hip circumference and height using the BAI formula. An alternative to BMI that uses only a tape measure — no scale needed.
Sunscreen Coverage Calculator
Calculate how much sunscreen you need for full body coverage. Most people apply too little. Find the right dose for real SPF protection.
UV Safe Sun Exposure Time Calculator
Calculate safe sun exposure minutes before burning from skin type and UV index. Includes sunscreen adjustment and vitamin D synthesis time estimates.
Body Fat Goal Calorie Calculator
Calculate the daily calorie deficit and timeline needed to reach your target body fat percentage while preserving muscle mass.
Bone Density T-Score Interpretation
Interpret your DEXA scan T-score to understand your bone density status — normal, osteopenia, or osteoporosis — and estimated fracture risk.
Chronotype Sleep Preference Calculator
Determine your chronotype (morning lark, intermediate, or night owl) and find your ideal sleep and wake times based on your natural rhythm.
EPOC After-Burn Calorie Calculator
Estimate calories burned after exercise through EPOC (Excess Post-Exercise Oxygen Consumption), the afterburn effect from high-intensity workouts.
Exercise Hydration Calculator
Calculate how much water to drink before, during, and after exercise based on your body weight, sweat rate, and workout intensity.
GAD-7 Anxiety Score Calculator
Score the GAD-7 anxiety questionnaire. Returns a total from 0-21 with minimal, mild, moderate, or severe ratings and recommended next steps for each level.
Gallstone Risk Calculator
Estimate your risk of developing gallstones based on age, sex, BMI, diet, and other known risk factors. Understand what you can and cannot change.
Herd Immunity Threshold Calculator
Calculate the vaccination coverage needed to achieve herd immunity based on a disease's basic reproduction number (R₀) and vaccine efficacy.
Home Gym vs Gym Membership Break-Even Calculator
Calculate when your home gym equipment investment pays for itself compared to a monthly gym membership. Includes maintenance costs and joining fees.
Kidney Stone Risk Calculator
Assess kidney stone risk from fluid intake, protein, sodium, and BMI. Returns low, moderate, or high risk rating with dietary and hydration recommendations.
PHQ-9 Depression Screening Score
Calculate your PHQ-9 (Patient Health Questionnaire) score to screen for depression severity. Rate 9 symptoms over the past 2 weeks.
Protein Source Cost Comparison Calculator
Compare cost per gram of protein from eggs, chicken, beef, tofu, and other sources. Find the most budget-friendly high-protein foods ranked by cost efficiency.
Sleep Deprivation Productivity Cost Calculator
Estimate the economic cost of sleep deprivation based on reduced productivity, increased errors, and health impacts at work.
Sunscreen SPF Protection Time Calculator
Calculate sunscreen time from SPF, Fitzpatrick skin type (I-VI), and UV index. Returns exposure window and reapplication schedule for outdoor activities.
VO2 Max Estimation from Step Test
Estimate VO2 max from the YMCA 3-minute step test using post-exercise heart rate, age, and sex. Returns ml/kg/min, fitness class, and predicted race times.
Wells PE Score Calculator
Calculate the Wells clinical prediction score for pulmonary embolism (PE) pretest probability. Helps clinicians determine if further testing is needed.
Blood Glucose Unit Converter
Convert blood glucose between mg/dL (USA) and mmol/L (international) instantly. Includes fasting, pre-diabetes, and diabetes reference ranges in both units.
HbA1c to eAG Calculator
Convert HbA1c percentage to estimated Average Glucose (eAG) in mg/dL and mmol/L using the ADA formula. Includes interpretation and diabetes risk ranges.
Ovulation Calculator
Predict your ovulation date and fertile window based on your last period and cycle length. Find your 6-day fertility window and peak conception day.
Absolute Risk Reduction (ARR) and NNT Calculator
Calculate ARR, RRR, NNT, and Relative Risk from control and treatment event rates for interpreting clinical trial results and evidence-based medicine.
APGAR Score Calculator
Calculate the APGAR score at 1 and 5 minutes after birth. Score appearance, pulse, grimace, activity, and respiration with automatic interpretation.
Blood Alcohol Content (BAC) Calculator
Calculate your blood alcohol content (BAC) using the Widmark formula. Know your impairment level, legal status, and time until sober before driving.
Dietary Reference Intake (RDA/RDI) Calculator
Look up RDA and Adequate Intakes for vitamins and minerals by age, sex, and life stage. Based on USDA/NIH dietary reference intakes for all essential nutrients.
Glycemic Load Calculator
Calculate the glycemic load (GL) of any food using its glycemic index and carbohydrate content. Includes preset GI values for common foods.
HbA1c to Blood Glucose Converter
Convert HbA1c percentage to average blood glucose (mg/dL or mmol/L) and back. Includes diabetes classification using ADA 2008 formula.
Head Circumference Percentile Calculator
Calculate a child's head circumference percentile by age and sex using WHO growth standards. Identify normal range, microcephaly, or macrocephaly indicators.
Insulin-to-Carb Ratio and Correction Factor Calculator
Calculate insulin-to-carb ratio (ICR), correction factor, and mealtime insulin dose. Estimates blood sugar correction for Type 1 and Type 2 diabetes management.
Lean Muscle Mass Calculator
Calculate your lean muscle mass using direct body fat percentage input or the Navy body fat estimation method based on circumference measurements.
Medication Half-Life and Clearance Calculator
Calculate drug concentration over time using half-life. Find time to steady state, time to clearance, and peak and trough levels for pharmacokinetics.
Number Needed to Treat (NNT) Calculator
Calculate NNT, NNH, ARR, RRR, relative risk, and odds ratio from clinical trial event rates. Essential tool for evidence-based medicine.
Pulse Pressure Calculator
Calculate pulse pressure and mean arterial pressure (MAP) from blood pressure readings. Understand what narrow or wide pulse pressure means for your health.
Relative Risk and Odds Ratio Calculator
Calculate Relative Risk (RR), Odds Ratio (OR), Absolute Risk Reduction (ARR), and Number Needed to Treat (NNT) from a 2×2 contingency table.
Sobriety Calculator
Calculate how long you have been sober. Track your clean days, weeks, months, and years — and see your next sobriety milestone.
CHA₂DS₂-VASc Stroke Risk Calculator
Calculate the CHA₂DS₂-VASc score for atrial fibrillation patients. Estimate annual stroke risk and determine anticoagulation therapy recommendations.
Child Growth Percentile Calculator
Calculate your child's height and weight percentile based on CDC growth charts for ages 2–20. Understand how your child compares to peers.
Cigarette Cost Calculator — Lifetime Smoking Cost
Calculate how much smoking costs over your lifetime in money, time, and health. Enter your daily cigarettes and pack price to see the shocking total.
Cold Water Survival Time Calculator
Estimate survival and exhaustion time in cold water at any temperature. Essential knowledge for boaters, swimmers, and water sports enthusiasts.
Conception Date Calculator
Estimate when conception occurred by working back from due date or birth date. Returns conception date range, first trimester start, and ultrasound comparison.
Drug Half-Life in Body Calculator
Calculate how long a drug stays in your body from its elimination half-life. See percentage remaining, time to full clearance, and concentration over time.
eGFR Kidney Function Calculator
Calculate estimated Glomerular Filtration Rate (eGFR) from serum creatinine using the CKD-EPI 2021 equation. Determine CKD stage and kidney function percentage.
Eye Prescription Calculator & Converter
Understand your eyeglass prescription. Convert sphere, cylinder, and axis values. Find your approximate lens power and understand what your numbers mean.
Period Tracker & Next Period Calculator
Calculate your next period date, fertile window, and ovulation date from your last period start and average cycle length. Plan and track your menstrual cycle.
Steps to Miles & Km Calculator
Convert steps walked into miles, kilometers, and calories burned. Uses your height or custom stride length to give accurate results for any fitness tracker.
Wells Score DVT Calculator
Calculate the Wells score for deep vein thrombosis (DVT) risk. Determine pretest probability to guide D-dimer testing and imaging decisions.
Meal Calorie Counter
Estimate calories in your meal by adding up common food items. Covers portions of bread, rice, meat, vegetables, dairy, and drinks.
BMR Calculator (Basal Metabolic Rate)
Calculate your Basal Metabolic Rate using the Harris-Benedict or Mifflin-St Jeor equation. Find your daily calorie burn at rest.
Compression Stocking Size Calculator
Find the right compression stocking size by entering your ankle, calf, and thigh circumference. Includes compression level guide for medical and travel use.
VO2 Max Training Zones Calculator
Calculate your 5 heart rate training zones from your VO2 max or max heart rate. Find the right intensity for fat burning, aerobic base, and peak performance.
Acetaminophen (Tylenol) Dosage Calculator
Calculate the correct acetaminophen (Tylenol, paracetamol) dose for adults and children based on weight and age. Avoid dangerous overdose with accurate dosing.
BUN-to-Creatinine Ratio Calculator
Calculate the BUN to Creatinine ratio to assess kidney function and help differentiate pre-renal, renal, and post-renal causes of elevated BUN or creatinine.
Calories Burned Running Calculator
Calculate calories burned running or jogging based on distance, speed, weight, and terrain. Find the metabolic equivalent (MET) and compare to walking.
Daily Carbohydrate Target Calculator
Calculate your recommended daily carbohydrate intake based on your calorie needs, activity level, and goals. Get targets for total carbs, fiber, and net carbs.
Daily Fat Intake Calculator
Calculate your recommended daily fat intake based on your calorie needs and health goals. Find target grams of total fat, saturated fat, and unsaturated fat.
Framingham 10-Year Heart Disease Risk Calculator
Estimate your 10-year risk of cardiovascular disease using the Framingham Risk Score — based on age, cholesterol, blood pressure, smoking, and diabetes.
HEART Score for Chest Pain Calculator
Calculate the HEART Score for chest pain in emergency settings. Stratify risk of major adverse cardiac events (MACE) to guide clinical decision-making.
HOMA-IR Insulin Resistance Calculator
Calculate your HOMA-IR score to estimate insulin resistance using fasting blood glucose and fasting insulin levels. Assess your metabolic health risk.
Ibuprofen Dosage Calculator
Calculate the correct ibuprofen dose based on weight and age. Find safe dosing intervals for adults and children for pain relief and fever reduction.
LDL Cholesterol Calculator (Friedewald Equation)
Calculate your LDL (bad) cholesterol using the Friedewald equation from a standard lipid panel. Understand your cardiovascular risk from cholesterol numbers.
Smoking Recovery Benefits Timeline
See the health benefits of quitting smoking on a timeline — from 20 minutes after your last cigarette to 15 years later. Calculate your personal milestones.
Waist-to-Height Ratio Calculator
Calculate waist-to-height ratio (WHtR), a measure of central obesity that predicts cardiovascular risk better than BMI alone for all ages and ethnicities.
Wells Criteria for DVT Calculator
Calculate the Wells Score for Deep Vein Thrombosis (DVT) probability. A clinical prediction tool to assess pre-test probability of DVT in outpatients.
Allergy Severity Score Calculator
Score your allergy symptoms on a structured severity scale covering nasal, eye, skin, and respiratory reactions. Know when symptoms warrant medical care.
Ankle Sprain Recovery Calculator
Estimate ankle sprain recovery time from Grade 1, 2, or 3 severity, age, and activity level. Get a week-by-week rehab timeline and return-to-sport milestones.
Ankle-Brachial Index Calculator
Calculate your Ankle-Brachial Index (ABI) to screen for peripheral artery disease. Enter ankle and arm blood pressures to get your ABI score.
Antibiotic Course Completion Calculator
Calculate days remaining in your antibiotic course and track doses to ensure full prescription completion. Returns daily dose schedule and warning if missed.
Basal Body Temperature Tracker
Track and analyze basal body temperature (BBT) to identify ovulation patterns and fertile windows. Supports Celsius and Fahrenheit.
Birth Control Reminder Calculator
Calculate how many pills remain in your pack, days until next pack, and set a refill reminder timeline. Never run out of birth control again.
Blood Donation Recovery Calculator
Find out how long it takes to recover after donating blood, platelets, or plasma. Includes fluid, iron, and red cell timelines.
Blood Pressure Category Calculator
Enter your systolic and diastolic blood pressure readings to find your category: normal, elevated, or hypertension stage 1, 2, or crisis.
Blood Pressure Risk Level Calculator
Assess your 10-year cardiovascular risk based on blood pressure, age, cholesterol, smoking, and diabetes. Based on AHA/ACC guidelines.
Blood Type Compatibility Calculator
Check blood type compatibility for transfusions and organ donations. Find which blood types you can give to or receive from.
Blood Volume Estimator
Estimate total blood volume in liters from height, weight, and sex using the Nadler equation. Useful for surgical planning and transfusion medicine.
Body Symmetry Measurement Calculator
Measure left-right body symmetry by comparing limb and body measurements. Useful for fitness, rehabilitation, and injury monitoring.
Breathing Exercise Timer Calculator
Set up timed breathing exercises including box breathing, 4-7-8, and diaphragmatic patterns. Calculate total session duration.
Cholesterol Goal Calculator
Find your target LDL cholesterol level based on cardiovascular risk factors. Covers AHA-recommended thresholds for low, moderate, and high-risk patients.
Contact Lens vs Glasses Cost Calculator
Compare the annual and lifetime costs of contact lenses vs eyeglasses. Find out which option is more affordable for your vision correction needs.
Cortisol Level Assessment
Assess your cortisol stress load based on lifestyle factors. Understand high vs. low cortisol symptoms and get actionable reduction tips.
Creatine Loading Phase Calculator
Calculate creatine loading dose (0.3 g/kg/day for 5 days) and maintenance dose (3-5 g) from body weight for strength and muscle performance.
Daily Steps Goal Calculator
Calculate a personalized daily step goal from age, fitness level, and health objectives. Targets weight loss, cardiovascular health, or general activity.
Daily Sugar Limit Calculator
Calculate your daily added sugar limit from age, sex, and health goals. See your allowance in grams and teaspoons with common food and drink comparisons.
Daily Water Weight Fluctuation Calculator
Calculate natural daily weight fluctuation from body weight and activity. Returns range in lbs and kg from sodium, glycogen, and hormonal cycles.
Dehydration Risk Assessment
Assess dehydration risk from activity intensity, heat, humidity, fluid intake, and symptoms. Returns a risk rating from low to severe with rehydration tips.
Dental Floss Usage Calculator
Calculate dental floss roll lifespan from roll length and daily usage. Returns days remaining and annual cost — ADA recommends 18 inches (45 cm) per session.
Ear Infection Risk Calculator (Children)
Assess ear infection risk in children based on age, daycare attendance, breastfeeding history, and symptoms. Helps parents decide when to see a doctor.
Electrolyte Balance Calculator
Estimate your daily electrolyte needs for sodium, potassium, magnesium, and calcium based on body weight, activity level, and sweat rate.
Exercise Blood Oxygen Calculator
Assess whether your SpO2 blood oxygen levels are safe during exercise. See how altitude, exertion, and fitness level affect oxygen saturation readings.
Eye Drop Supply Duration Calculator
Calculate how many days your eye drop bottle will last based on drops per day, eyes treated, and bottle size. Never run out unexpectedly.
Fever Temperature Calculator
Classify a body temperature reading as normal, low-grade fever, moderate fever, or high fever. Supports both Celsius and Fahrenheit, with age-based guidance.
Flu Recovery Timeline Calculator
Estimate your flu recovery timeline based on symptom onset, age, and health status. Know when to expect to feel better and when to see a doctor.
Foot Arch Type Assessment
Determine your foot arch type — flat, normal, or high — and get shoe and insole recommendations to reduce pain and improve comfort.
Grip Strength vs Age Calculator
Compare your hand grip strength to age and gender norms. See whether your result is below average, average, above average, or in the athletic range.
Gut Health Score Calculator
Assess gut health based on diet, bowel habits, symptoms, and lifestyle factors. Returns a personalized 0-100 score with microbiome improvement tips.
Hand Washing Duration Calculator
Calculate the optimal hand washing duration for different situations. Learn how long each step should take for effective germ removal.
Hangover Duration Calculator
Estimate hangover duration from number of drinks, body weight, sleep hours, and hydration level. Returns severity rating and recovery tips for common symptoms.
Intermittent Fasting Window Calculator
Calculate your eating and fasting windows for any IF protocol: 16:8, 18:6, 20:4, 5:2, and more. Find the best schedule for your lifestyle.
Joint Flexibility Score Calculator
Assess your overall joint flexibility and hypermobility with the Beighton Score method. Understand your mobility level and injury risks.
LASIK vs Glasses Long-Term Cost Calculator
Compare the lifetime cost of LASIK eye surgery against years of buying glasses and contact lenses. Find your break-even point.
Medication Expiry Safety Guide
Understand what happens to medications after their expiration date. Learn which drugs are safe to use past expiry and which ones you must replace.
Migraine Trigger Tracker Score
Score your migraine risk on a 0-100 scale by rating 12 common triggers including sleep, stress, caffeine, alcohol, hydration, and barometric pressure.
Mold Growth Risk Calculator
Assess the mold risk in any room based on indoor humidity and temperature. Know when conditions are dangerous and how to prevent mold growth.
Muscle Recovery Time Calculator
Estimate muscle recovery time from exercise type, intensity, and fitness level. Covers upper body, lower body, and full-body workouts with overtraining risk.
Optimal Nap Duration Calculator
Find the optimal nap length for your goal and available time. Covers 10-min power naps, 20-min stage-2 naps, and 90-min full sleep cycle naps.
Posture Ergonomics Score Calculator
Assess your workstation ergonomics and posture habits. Get a score and personalized tips to reduce neck, back, and eye strain.
Pregnancy BMI Calculator
Calculate pre-pregnancy BMI and get the IOM-recommended gestational weight gain range for underweight, normal, overweight, and obese starting BMI categories.
Probiotics Dosage Calculator
Calculate the right probiotic dosage based on your health goal, age, and CFU needs. Includes guidance for adults, children, and specific conditions.
Radon Level Risk Calculator
Assess your radon exposure risk based on measured radon levels. Understand EPA action levels and when to mitigate radon in your home.
Recovery Heart Rate Calculator
Calculate your heart rate recovery (HRR) after exercise to assess cardiovascular fitness. A 1-minute drop of 12+ BPM indicates good heart health.
Resting Metabolic Rate Calculator
Calculate resting metabolic rate using Mifflin-St Jeor equation from weight, height, age, and sex. Returns calories at rest and TDEE for five activity levels.
Safe Lifting Weight Calculator
Calculate the maximum safe weight you should lift based on NIOSH guidelines, your height, gender, and lifting conditions. Prevent back injuries.
Scar Healing Time Calculator
Estimate scar healing and fading time from wound type, body location, age, and skin tone. Includes a week-by-week timeline and tips to minimize scarring.
Screen Break (20-20-20 Rule) Calculator
Plan your 20-20-20 eye break schedule to reduce digital eye strain. Enter daily screen hours to get total breaks, daily rest time, and a reminder schedule.
Screen Eye Strain Calculator
Calculate digital eye strain risk from daily screen hours, viewing distance, break frequency, and lighting. Returns a risk score with tips to reduce symptoms.
Skin Cancer Risk Assessment (UV Exposure)
Assess your skin cancer risk based on UV exposure history, skin type, and protective behaviors using established risk factors.
Snoring Risk Score Calculator
Estimate your snoring risk based on lifestyle, anatomy, and sleep habits. Identify potential causes and when to seek medical advice.
Sodium-Potassium Ratio Calculator
Calculate your sodium-to-potassium ratio and see if your electrolyte balance is optimal for heart health and blood pressure.
SPF Sun Safe Exposure Time Calculator
Calculate how long you can safely stay in the sun based on your skin type, SPF sunscreen, and UV index. Prevent sunburn and skin damage.
Standing vs Sitting Calories Calculator
Compare calories burned standing vs sitting per hour. Enter your weight and hours to see the difference and daily calorie impact.
Sunburn Recovery Time Calculator
Estimate sunburn healing time from burn severity and skin type. Returns stage-by-stage recovery timeline and guidance on when to see a doctor.
Tattoo Healing Timeline Calculator
See the complete tattoo healing timeline based on tattoo size and placement. Know what to expect at each stage and when your tattoo is fully healed.
Thyroid Level (TSH) Assessment
Interpret your TSH thyroid test result. Understand if your level is normal, high (hypothyroid), or low (hyperthyroid) with context by age group.
Tooth Brushing Timer and Coverage Calculator
Calculate brushing time per tooth zone using ADA 2-minute guidelines. Returns seconds per quadrant and coverage check for front, back, and chewing surfaces.
Vaccine Schedule Age Calculator
Find vaccines recommended for your age based on CDC and WHO immunization schedules. Covers childhood, teen, adult, and travel vaccines with timing guidance.
Vitamin A Daily Intake Calculator
Calculate your recommended daily Vitamin A intake based on age, sex, and life stage. Check if you meet the RDA and avoid toxicity.
VO2 Max Estimate Calculator
Estimate your VO2 max from resting heart rate and age using the Uth-Sørensen formula. A simple way to gauge your aerobic fitness level.
Wound Healing Time Estimator
Estimate wound healing time for cuts, abrasions, burns, and surgical incisions from depth, size, and health factors. Returns phase timeline and care guidance.
Altitude Hydration Calculator
Calculate how much extra water you need at high altitude based on elevation and activity level. Prevent dehydration and lower your altitude sickness risk.
Army Body Fat Calculator
Calculate your body fat percentage using the US military tape test method. Check if you meet Army, Navy, Air Force, or Marine Corps standards.
Blood Donation Eligibility Calculator
Check blood donation eligibility from age, weight, health status, and recent activities. Covers the 110 lb minimum, 56-day interval, and travel restrictions.
Blood Oxygen Level (SpO2) Calculator
Estimate blood oxygen saturation levels and understand SpO2 readings. Learn what normal, low, and critical oxygen levels mean.
Blood Oxygen Level Guide
Look up what any SpO2 reading means from a pulse oximeter. Explains normal (95-100%), low (90-94%), and critically low levels with symptoms and guidance.
Body Type Calculator
Determine your body type — ectomorph, mesomorph, or endomorph — based on your measurements. Get personalized exercise and nutrition tips.
Body Water Percentage Calculator
Estimate total body water percentage from age, weight, height, and gender using the Watson formula. Compare to healthy ranges for men, women, and older adults.
Bone Age Estimation Calculator
Estimate bone age for children based on chronological age, height, and gender. Understand skeletal maturity and growth potential.
Caffeine Intake Calculator
Track daily caffeine intake from coffee, tea, energy drinks, and soda. Returns total mg and shows if you are within the FDA safe limit of 400 mg per day.
Caffeine Metabolism Calculator
Estimate how long caffeine stays in your system from intake amount and metabolism speed. Half-life is 5-6 hours. Returns time until below 25mg and sleep-safe.
Creatine Dosage Calculator
Calculate your optimal creatine loading and maintenance dose based on body weight. Includes timing recommendations and FAQ.
Cutting Calculator
Calculate your daily calorie deficit for a bodybuilding cut. Get calorie, protein, and macro targets to preserve muscle while losing fat.
Daily Calcium Needs Calculator
Calculate recommended daily calcium intake in mg from age, gender, and life stage. Includes top dietary sources, absorption tips, and pregnancy guidance.
Daily Fiber Intake Calculator
Calculate your recommended daily fiber intake by age, sex, and calorie needs. See your target in grams and compare it to the fiber content of common foods.
Daily Hydration Needs Calculator
Calculate your daily water intake from body weight, activity level, and climate. Get a personalized hydration target in liters, milliliters, and cups per day.
Daily Omega-3 Needs Calculator
Calculate daily EPA and DHA omega-3 needs from age, sex, and health goals. Returns intake targets for heart health, brain function, and food source comparisons.
Daily Potassium Needs Calculator
Calculate daily potassium target in mg from age, sex, and health status. Returns adequate intake, top food sources per serving, and cautions for kidney disease.
Daily Protein Intake Calculator
Calculate your recommended daily protein intake based on weight, age, and activity level. Covers sedentary to athletic needs.
Daily Sugar Intake Calculator
Calculate daily added sugar limit per WHO and AHA guidelines from age, sex, and calorie intake. AHA recommends 25g per day for women and 36g for men.
Fetal Weight Estimator
Estimate fetal weight and length by gestational week from week 8 to 40. Includes average weight in grams and ounces with trimester milestones.
Fitzpatrick Skin Type Calculator
Determine your Fitzpatrick skin type (I-VI) from tanning and burning response. Returns classification, melanin level, minimum SPF, and UV protection advice.
Flexibility Score Calculator
Assess flexibility using the sit-and-reach test. Enter your reach distance for a rating and comparison to age and gender norms from excellent to poor.
Folate Intake Calculator
Calculate recommended daily folate (vitamin B9) from age, gender, and pregnancy status. Returns DFE target and sources. Pregnant women need 600 mcg DFE daily.
Gestational Age Calculator
Calculate gestational age in weeks from last menstrual period. Returns trimester, estimated due date, fetal milestones by week, and prenatal appointment dates.
Grip Strength Calculator
Compare grip strength in kg or lbs to age and sex norms. Returns percentile ranking, strength category, and cardiovascular health risk prediction.
Hearing Damage Risk Calculator
Estimate safe noise exposure time from sound level in decibels using NIOSH and OSHA guidelines. 85 dB safe for 8 hrs (NIOSH), 90 dB for 8 hrs (OSHA).
Hearing Frequency Range Calculator
Estimate your hearing frequency range in Hz from age and noise exposure history. Compare your upper limit to the 20 Hz to 20,000 Hz normal hearing range.
Hearing Loss Risk Calculator
Assess noise-induced hearing loss risk from daily sound exposure. Compares against OSHA and NIOSH guidelines — returns safe listening time by dB level.
Heart Rate Zones Calculator
Calculate your five training heart rate zones based on age or max heart rate. Optimize cardio, fat burn, and endurance training.
Iron Deficiency Risk Calculator
Assess your risk of iron deficiency based on diet, lifestyle, and symptoms. Get personalized recommendations for iron intake.
Keto Macro Calculator
Calculate your ideal ketogenic diet macros. Get personalized daily targets for fat, protein, carbs, and calories based on your body and goals.
Lean Bulk Calculator
Calculate daily calorie and protein targets for a lean bulk phase. Set the right caloric surplus to maximize muscle growth while keeping fat gain minimal.
Life Expectancy Calculator
Estimate your life expectancy based on lifestyle factors. See how exercise, diet, smoking, and other habits affect your expected lifespan.
Lung Capacity Estimator
Estimate predicted lung capacity and FEV1 from age, height, and sex using Quanjer equations. Returns comparison to normal spirometry values for lung health.
Magnesium Intake Calculator
Calculate recommended daily magnesium intake by age and sex. Returns the NIH daily target in mg for men, women, teens, pregnant, and lactating adults.
Melatonin Dosage Calculator
Find recommended melatonin dose from age, weight, and sleep concern. Covers jet lag, insomnia, and shift work with timing and maximum safe dose by age.
Muscle Mass Estimator
Estimate skeletal muscle mass percentage from body measurements, age, and gender. Compare to healthy reference ranges for men and women by age group.
Omega-3 Intake Calculator
Calculate recommended daily omega-3 intake (EPA + DHA) from age, diet type, and health goals. Includes food sources and fish oil supplement dosage guidance.
Posture Score Calculator
Assess daily posture habits across sitting, standing, and sleeping for a posture score with targeted improvement recommendations and exercises per problem area.
Potassium Intake Calculator
Calculate recommended daily potassium in mg from age, sex, and blood pressure status. Returns NIH Adequate Intake target and top food sources per serving.
Resting Heart Rate Analyzer
Analyze resting heart rate and get a fitness rating by age and gender. Includes heart rate zones, athletic benchmarks, and guidance on when to see a doctor.
Sobriety Tracker Calculator
Track sobriety from your clean date — see days, weeks, months, and years sober. Shows recovery milestones at 24 hours, 1 week, 1 month, and 1 year.
Target Heart Rate Calculator
Calculate target heart rate zones for fat burn, cardio, and peak training from age and resting HR. Returns 5 BPM zones using the Karvonen formula.
Vitamin B12 Needs Calculator
Estimate daily vitamin B12 needs from age, diet type, and absorption factors. Covers higher needs for vegans, older adults, and people taking metformin.
Vitamin D Sun Exposure Calculator
Estimate sun exposure for vitamin D from Fitzpatrick skin type (I-VI), latitude, and season. Returns midday minutes needed and winter supplement dose.
Zinc Intake Calculator
Find daily zinc intake in mg from age, sex, and diet. Returns RDA and upper limit with top food sources ranked by zinc content for omnivores and vegetarians.
Alcohol Metabolism Calculator
Estimate how long until you are sober based on your weight, drinks consumed, and time drinking. See your estimated BAC over time.
Blood Pressure Category Checker
Enter your systolic and diastolic blood pressure readings to find your category. Covers normal, elevated, high stage 1, stage 2, and crisis.
Blood Sugar Conversion Calculator
Convert blood sugar levels between mg/dL and mmol/L. Includes reference ranges for fasting, post-meal, and A1C equivalents.
Body Surface Area (BSA) Calculator
Calculate Body Surface Area using the Mosteller formula. Supports metric and imperial units. Used for medication dosing and clinical assessments.
Caffeine Half-Life Calculator
Calculate how much caffeine remains in your body over time. See when caffeine levels drop low enough for a good night of sleep.
Daily Water Intake Calculator
Calculate how much water you should drink daily based on your weight and activity level. Shows results in liters, ounces, and glasses.
Heart Rate Training Zones Calculator
Calculate your five training heart rate zones based on age and resting heart rate. Uses the Karvonen method for personalized zones.
Infant Growth Percentile Tracker
Track your baby growth percentile based on age, weight, and length. Uses simplified WHO growth chart data for boys and girls.
IVF Due Date Calculator
Estimate your due date after IVF embryo transfer. Supports both Day 3 and Day 5 (blastocyst) transfers with accurate date calculations.
Lean Body Mass Calculator
Calculate your lean body mass from weight and body fat percentage. See your fat mass, lean mass, and body composition breakdown.
Macro Calculator
Calculate your daily protein, carbs, and fat targets based on your TDEE and fitness goal. Supports cutting, maintenance, and bulking.
Medication Dosage by Weight Calculator
Calculate the correct medication dosage based on body weight using mg/kg dosing. Supports adults and children in metric and imperial units.
One Rep Max (1RM) Calculator
Estimate your one-rep max from the weight and reps you lifted. Uses the Epley formula to calculate your maximum strength for any exercise.
Pregnancy Due Date Calculator
Calculate your estimated due date from your last menstrual period. See your current week, trimester, and key pregnancy milestones.
Running Pace Calculator
Calculate your running pace from distance and time, or find your finish time from pace and distance. Supports miles and kilometers.
Sleep Cycle Calculator
Find the optimal bedtime or wake time based on 90-minute sleep cycles. Wake up feeling refreshed by timing your sleep correctly.
VO2 Max Calculator
Estimate VO2 max from a timed run or Cooper 12-minute test. Returns aerobic fitness class by age and sex, predicted race paces, and training zone heart rates.
Allergy Season Calculator
Check expected tree, grass, and weed pollen by US region and month. Returns peak dates, outdoor risk level, and prevention tips for hay fever sufferers.
Blood Type Compatibility Calculator
Find blood donation and transfusion compatibility for all ABO and Rh types. Shows O- as universal donor, AB+ as universal recipient, and full chart.
BMI Formula Calculator
Calculate Body Mass Index in metric (kg/m²) or imperial (lb/in²) using the WHO formula. Returns BMI category from underweight to obese with health context.
BMI Goal Weight Calculator
Find your target weight for any BMI goal. Enter your height to see the exact weight range for underweight, healthy, overweight, and obese BMI thresholds.
Calcium Intake Calculator
Find your recommended daily calcium intake based on age and gender. Includes food sources to help you meet your calcium needs.
Daily Calorie Need
Estimate daily calorie needs using the Mifflin-St Jeor formula from age, gender, height, weight, and activity. Returns loss, maintenance, and gain targets.
Glasses Prescription Converter
Convert glasses prescription between plus and minus cylinder notation. Transpose sphere, cylinder, and axis values to match any optician or retailer format.
Intermittent Fasting Timer Calculator
Calculate your eating window and fasting end time from last meal time and protocol. Supports 16:8, 18:6, 20:4, and OMAD intermittent fasting schedules.
Menstrual Cycle / Period Tracker Calculator
Estimate your next period date, PMS window, and fertile window based on your last period and cycle length. A simple planning tool.
Pace Converter Calculator
Convert running pace between min/km, min/mile, km/h, and mph. Enter any format to see all speed and pace equivalents for training zone and race planning.
Posture Break Reminder Calculator
Calculate optimal desk break schedule from work hours and sitting duration. Returns break frequency, breaks per day, and stretches for each interval.
Screen Viewing Distance Calculator
Find the ideal viewing distance for your TV, monitor, or phone based on screen size and type. Reduce eye strain with proper positioning.
Shoe Replacement Calculator
Estimate when running shoes need replacing from weekly mileage and shoe type. Based on the 300-500 mile guideline with adjustments for weight and surface.
Sleep Debt Calculator
Calculate accumulated sleep debt from hours slept vs the 7-9 hour recommendation. Returns total hours owed, cognitive impairment level, and recovery schedule.
Standing Desk Timer Calculator
Plan your ideal sit-stand schedule at work. Enter your hours and preferred ratio to get a standing desk routine that reduces fatigue.
Step Length Calculator
Estimate step and stride length from height and gender. Use these values to calibrate your pedometer or GPS watch for more accurate distance and step tracking.
Steps to Miles/Km
Convert step count to miles or kilometers using your stride length. See how far 5,000 and 10,000 steps take you based on your height and walking pace.
Stretching Routine Calculator
Generate a stretching routine from target body areas and available time. Returns named stretches, hold duration in seconds, repetitions, and total time.
Supplement Cost per Day Calculator
Calculate daily and annual supplement cost from bottle price and servings per container. Compares up to three brands side by side on cost per serving.
TDEE by Activity Calculator
Calculate your Total Daily Energy Expenditure separately for rest days and training days. Tailored calorie targets for each.
Vitamin C Daily Need Calculator
Find recommended Vitamin C intake from age, sex, and smoking status per NIH. Returns RDA, tolerable upper limit, food source rankings, and supplement guidance.
Water Bottle Refills Calculator
Calculate how many times you need to refill your water bottle each day to meet your hydration goal. Works with any bottle size.
20-20-20 Rule Timer Calculator
Plan screen breaks using the 20-20-20 rule to reduce digital eye strain. Enter daily screen hours to get break reminders and total rest time recommendations.
A1C to Blood Sugar Calculator
Convert A1C percentage to estimated average glucose (eAG) in mg/dL and mmol/L. See how your A1C compares to normal, prediabetes, and diabetes ranges.
Adjusted Body Weight Calculator
Calculate adjusted body weight (ABW) for drug dosing in obese patients. Used in anesthesia and pharmacology for accurate medication calculations.
Alcohol Units Calculator
Calculate alcohol units in beer, wine, and spirits using ABV and volume. Compare weekly total against UK and WHO recommended limits of 14 units per week.
Antibiotic Schedule Calculator
Generate a complete antibiotic dosing schedule with times and end date based on doses per day, start time, and course length.
BAC (Blood Alcohol Content) Calculator
Estimate your blood alcohol content based on weight, gender, number of drinks, and time spent drinking. Always drink responsibly.
Blood Sugar Converter
Convert blood sugar levels between mg/dL and mmol/L. Includes reference ranges for fasting, post-meal, and A1C equivalents.
BMI Calculator
Calculate BMI in metric (kg and cm) or imperial (lb and inches). Returns WHO classification from underweight to obese and healthy weight range for height.
Body Fat Calculator (US Navy Method)
Estimate body fat using the US Navy method from neck, waist, and hip measurements in inches or cm. Returns fat %, fat mass, lean mass, and fitness category.
Body Frame Size Calculator
Determine your body frame size (small, medium, or large) using wrist circumference and height. Helps interpret ideal weight ranges.
Breast Milk Storage Duration Calculator
Find safe storage times for expressed breast milk at room temperature, in the refrigerator, or in the freezer based on CDC guidelines.
Calorie Calculator (TDEE)
Calculate BMR and TDEE using the Mifflin-St Jeor equation. Find daily calories to maintain weight, lose fat, or gain muscle for your age, height, and activity.
Calorie Deficit Calculator
Calculate the daily calorie deficit needed to reach your target weight in your desired timeline. Safe and sustainable weight loss planning.
Calories Burned Walking Calculator
Calculate calories burned walking from body weight, distance, and pace using MET values (slow 2.8, brisk 3.8, fast 5.0). Returns kcal and steps estimate.
Carb Counter Calculator
Calculate total carbs, fiber, and net carbs for common foods by serving size in grams or cups. Covers bread, rice, pasta, fruits, and vegetables.
Cholesterol Ratio Calculator
Calculate your cholesterol ratios including Total/HDL, LDL/HDL, and triglyceride ratios for cardiovascular risk assessment.
Corrected Calcium Calculator
Calculate corrected calcium for low albumin levels. Enter total serum calcium and albumin to get the adjusted calcium value.
Creatinine Clearance Calculator (Cockcroft-Gault)
Calculate creatinine clearance using the Cockcroft-Gault equation. Estimates kidney function for medication dosing. Supports metric and imperial units.
Daily Fiber Intake Calculator
Calculate daily fiber intake from age, sex, and calorie needs per USDA guidelines. Returns target, current deficit, and top food sources to close the gap.
Daily Iron Intake Calculator
Find daily iron intake in mg from age, sex, pregnancy status, and diet type. Returns NIH RDA, top food sources by mg per serving, and absorption tips.
Daily Steps to Distance Calculator
Convert step count to distance in km or miles and calories from height and pace. Returns stride length, distance for 5K and 10K goals, and steps per mile.
GFR Calculator (Kidney Function)
Estimate glomerular filtration rate (eGFR) using the CKD-EPI equation. Enter age, serum creatinine, and sex to assess kidney function stage.
Healthy Weight Range Calculator
Find healthy weight range from height using BMI 18.5-24.9 guidelines. Returns underweight, normal, overweight, and obese thresholds in pounds and kg.
Hearing Frequency by Age Calculator
Estimate maximum hearing frequency from age and exposure history. Shows how presbycusis reduces hearing from 20,000 Hz at birth to 8,000-12,000 Hz by age 60.
Hydration Check Calculator
Check hydration status from urine color, activity level, body weight, and temperature. Returns daily water intake target in oz and ml with personalized tips.
Ideal Weight Calculator
Calculate your ideal body weight range using the Devine, Robinson, and Miller formulas. Supports both metric and imperial units.
IV Drip Rate Calculator
Calculate IV drip rate in drops per minute from volume, infusion time, and drop factor. Supports macro (10-20 gtts/mL) and micro drip (60 gtts/mL) sets.
Macro Calculator
Calculate daily protein, carbohydrate, and fat targets from your TDEE, fitness goal, and preferred diet type. Supports cut, bulk, maintain, and keto macros.
Medical Unit Converter
Convert between mg/dL and mmol/L for blood glucose, cholesterol, and other common lab values. Essential for understanding international medical reports.
Medication Dosage by Weight Calculator
Calculate medication dosage in mg from body weight using mg/kg guidelines for adults and children. Supports standard dose ranges and maximum daily dose limits.
Medication Reminder Calculator
Calculate evenly spaced medication times from dose count per day and first dose time. Returns exact schedule for 2, 3, 4, or 6 daily doses.
Metabolic Age Estimator
Estimate metabolic age by comparing your BMR to average values by age group. See if your metabolism is younger, older, or on par with your calendar age.
Pediatric Dose Calculator
Calculate pediatric doses by weight or age using Clark's Rule and Young's Rule. Enter adult dose and child data for safe pediatric medication dosing.
Pre-Pregnancy BMI & Weight Gain Calculator
Calculate pre-pregnancy BMI and IOM-recommended gestational weight gain range by category: underweight, normal, overweight, and obese in lbs and kg.
Pregnancy Due Date Calculator
Estimate your pregnancy due date based on your last menstrual period or conception date. See your current week and trimester.
Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain from pre-pregnancy BMI and current week. Returns total range and weekly targets per ACOG guidelines.
Protein Need Calculator
Calculate daily protein in grams from body weight, activity, and goals. Returns targets per kg and lb for sedentary, active, and muscle-building routines.
Running Heart Rate Zones Calculator
Calculate your 5 training heart rate zones using the Karvonen formula. Enter max and resting heart rate for personalized zones.
Senior BMI Calculator
Calculate BMI for adults 65+ with age-adjusted healthy ranges. Standard BMI charts don't apply to seniors — this calculator uses the recommended 22-27 range.
Sick Day Fluid Intake Calculator
Calculate daily fluid needs when sick from body weight and fever severity. Get hydration targets for illness broken down by drink type and hourly schedule.
Sleep Need Calculator
Find out how much sleep you need based on age. Get NSF-recommended sleep hour ranges from infants through older adults with tips for better sleep quality.
Smoking Cost Calculator
Calculate how much you spend on cigarettes daily, monthly, and yearly. See your potential savings over 10 years if you quit.
Sodium Intake Tracker
Track your daily sodium intake and compare it to the recommended 2,300mg limit. See your health tier and get practical tips to reduce sodium.
SpO2 Oxygen Saturation Guide
Enter your pulse oximeter SpO2 reading to see whether it is normal, concerning, or an emergency. Covers all saturation ranges from 100% down to critical.
Steps Goal Calculator
Calculate the daily step increase needed to reach your target steps within a set number of days. Track your walking progress.
Sunscreen Amount Calculator
Calculate sunscreen needed per application from body surface area and SPF. Returns grams using the 2 mg/cm² standard and how long a 100g or 200g bottle lasts.
Target Heart Rate Calculator
Calculate your maximum heart rate and target zones for fat burn, cardio, and peak training. Uses the Karvonen method when resting heart rate is provided.
Teen BMI Percentile Calculator
Calculate BMI percentile for teenagers aged 13-19. Uses CDC growth charts to determine healthy weight status by age and gender.
Time to Sober Calculator
Estimate hours until blood alcohol content (BAC) reaches 0.00 from current BAC level. BAC drops approximately 0.015 per hour regardless of food or coffee.
Vision Prescription Converter
Convert glasses prescription to contact lens Rx with vertex distance adjustment. Adjusts sphere power for myopia, hyperopia, and astigmatism corrections.
Vitamin D Calculator
Estimate Vitamin D needs from weight, skin tone, latitude, and season. Returns sun synthesis potential and supplement dose — NIH RDA is 600 IU for adults.
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio (WHR) and cardiovascular risk category. Supports inches and centimeters with WHO reference ranges for men and women.
Walking Speed Estimator
Calculate walking speed in mph and km/h from distance and time. Returns fitness classification for your age group and a calories burned estimate per mile.