Health Formulas
Health and fitness formulas for body measurements, metabolic calculations, and wellness assessments.
Blood Alcohol Content (BAC) Formula
Calculate estimated Blood Alcohol Content using the Widmark formula. Accounts for body weight, gender, alcohol consumed, and time elapsed.
BMI Formula (Body Mass Index)
Calculate Body Mass Index using BMI = weight/height². Includes both metric and imperial formulas with BMI category ranges.
BMR Formula (Basal Metabolic Rate)
Calculate Basal Metabolic Rate using the Harris-Benedict equation. Separate formulas for men and women in both metric and imperial units.
Body Fat Percentage Formula (Navy Method)
Estimate body fat percentage using the U.S. Navy method with circumference measurements. Separate formulas for men and women in metric and imperial.
Caloric Needs Formula (TDEE)
Calculate Total Daily Energy Expenditure using TDEE = BMR × Activity Factor. Find how many calories you need per day based on your lifestyle.
Ideal Body Weight Formula (Devine)
Estimate ideal body weight using the Devine formula. Separate calculations for men and women using height in inches or centimetres.
Target Heart Rate Formula (Karvonen Method)
Calculate your target heart rate zone using the Karvonen formula. Optimise exercise intensity with THR = ((Max HR - Resting HR) × %Intensity) + Resting HR.
Waist-to-Hip Ratio Formula
Calculate waist-to-hip ratio (WHR) to assess health risk. A simple measurement used worldwide for both metric and imperial body measurements.