Science
Free science calculators: speed, force, energy, density, and more.
Battery Energy Calculator
Calculate battery energy in Wh and kWh from voltage and amp-hours. Estimate runtime at a given load.
BMI Formula Calculator
Calculate Body Mass Index using the standard WHO formula with both metric and imperial inputs.
CO2 Emissions per Mile/km Calculator
Calculate CO2 emissions per mile or kilometer by vehicle type and fuel type. Understand your carbon footprint from driving.
Electrical Power Calculator (Ohm's Law + Power Wheel)
Enter any two of Voltage, Current, Resistance, or Power and calculate the other two using Ohm's Law and the power formula.
Electricity Bill Estimator
Estimate your monthly electricity bill based on appliance usage and your electricity rate.
Gas Pressure at Depth Calculator
Calculate the pressure at a given depth in water, seawater, or other fluids. Supports metric and imperial units.
Magnetic Field Calculator
Calculate the magnetic field strength around a straight current-carrying wire using the Biot-Savart law (simplified).
Projectile Motion Calculator
Calculate maximum height, range, and time of flight for a projectile. Enter launch velocity and angle to see the full trajectory.
Specific Gravity Calculator
Calculate specific gravity from substance and reference densities. Instantly tells you if the material will float or sink.
Static Water Pressure Calculator
Calculate water pressure at the bottom of a column based on elevation difference. Supports PSI and bar units.
Torque Calculator
Calculate torque from force and distance, or solve for any missing variable. Enter two values to find the third.
Voltage Drop Calculator
Calculate voltage drop in electrical wiring based on wire gauge, length, and current.
Wavelength to Color Calculator
Convert a light wavelength in nanometers to its visible color name, approximate RGB value, and frequency in THz.
Wire Resistance Calculator
Calculate the electrical resistance of a wire based on material, length, and gauge. Supports imperial and metric units.
Acceleration Calculator
Calculate acceleration from initial velocity, final velocity, and time. Also computes distance traveled during acceleration.
Boiling Point at Altitude Calculator
Calculate the boiling point of water at any altitude. See how elevation affects cooking and water boiling temperature.
Boyle's Law Calculator
Calculate pressure or volume changes using Boyle's Law (P1×V1 = P2×V2). Find any missing variable.
Buoyancy Calculator
Calculate buoyant force and whether an object will float or sink. Enter object volume, object density, and fluid density.
Carbon-14 Dating Calculator
Estimate the age of an organic sample based on the remaining percentage of Carbon-14.
Centripetal Force Calculator
Calculate centripetal force and acceleration for circular motion. Enter mass, velocity, and radius to find the force keeping an object in its path.
CO2 in Room Calculator
Estimate CO2 levels in a room based on volume, occupants, and ventilation rate. Check if your indoor air quality is healthy.
Coulomb's Law Calculator
Calculate the electric force between two charged particles using Coulomb's Law. Enter charges and distance to find the force.
Decibel Calculator
Calculate the decibel (dB) difference between two power or intensity levels, or convert dB to intensity ratio.
Density Calculator
Calculate density, mass, or volume using the density formula. Essential for physics and chemistry.
Dew Point Calculator
Calculate the dew point from temperature and relative humidity. See comfort level and condensation risk. Supports Fahrenheit and Celsius.
Dilution Calculator
Calculate dilution using C1×V1 = C2×V2. Find any missing variable for solution preparation.
Drug Half-Life Calculator
Calculate the remaining dose of a medication in your system based on initial dose, half-life, and time elapsed.
Earthquake Energy Calculator
Enter an earthquake magnitude and see the energy released in joules and TNT equivalent. Understand the power behind Richter scale numbers.
Electricity Cost / kWh Calculator
Calculate how much electricity an appliance uses per month and what it costs. Enter watts, hours per day, and your electricity rate.
Escape Velocity Calculator
Calculate the escape velocity for any celestial body from its mass and radius. Includes presets for Earth, Moon, and Mars.
Force Calculator (Newton's Second Law)
Calculate force, mass, or acceleration using F = ma. Essential for physics problems.
Fuel Energy Content Calculator
Calculate the energy content of gasoline, diesel, natural gas, or propane in BTU and kilojoules. Compare fuel types by energy density.
Gravity / Free Fall Calculator
Calculate free fall time and impact velocity from height, or find height from fall time. Supports both metric and imperial units.
Heat Index Calculator
Calculate the feels-like temperature based on air temperature and relative humidity. Includes danger level warnings for heat-related illness.
Heat Transfer Calculator (Q = mcΔT)
Calculate heat energy transferred using mass, specific heat capacity, and temperature change. Supports joules, calories, and BTU output.
Ideal Gas Law Calculator
Calculate pressure, volume, moles, or temperature using the ideal gas law PV = nRT. Supports all four solve modes.
Kinetic Energy Calculator
Calculate kinetic energy from mass and velocity using KE = ½mv². Supports SI (Joules) and Imperial (ft·lbf) units.
Light Year Distance Calculator
Convert between light years, kilometers, miles, and astronomical units (AU). Works in both directions.
Lightning Distance Calculator
Calculate how far away lightning struck based on the seconds between the flash and thunder.
Momentum Calculator
Calculate momentum from mass and velocity, or use the collision calculator to find velocities after elastic and inelastic collisions.
Noise Reduction Calculator
Calculate how much a noise barrier reduces sound levels. Enter source decibels, barrier NRC rating, and distance for the reduced dB level.
Ohm's Law Calculator
Calculate voltage, current, or resistance using Ohm's Law. Essential for electronics and electrical engineering.
Pendulum Calculator
Calculate the period and frequency of a simple pendulum based on its length.
pH Calculator
Calculate pH from hydrogen ion concentration or find H+ concentration from pH. Shows whether a solution is acidic, basic, or neutral.
Pipe Volume Calculator
Calculate the volume of water or fluid inside a pipe by entering diameter and length. Supports inches, feet, centimeters, and meters.
Pool Evaporation Calculator
Estimate how much water your pool loses to evaporation each day based on pool area, temperature, humidity, and wind.
Pressure at Altitude Calculator
Calculate atmospheric pressure at any altitude. Supports feet and meters with results in multiple pressure units.
Radioactive Decay Calculator
Calculate the remaining amount of a radioactive substance after a given time using the half-life decay formula.
Relative Humidity Calculator
Calculate relative humidity from dry bulb and wet bulb temperatures. Supports Fahrenheit and Celsius with psychrometric formulas.
Reynolds Number Calculator
Calculate the Reynolds number to determine if fluid flow is laminar or turbulent based on velocity, diameter, and viscosity.
Solar Panel Output Calculator
Calculate how much electricity your solar panels will produce per day, month, and year. Enter panel wattage, sun hours, and efficiency.
Speed of Sound Calculator
Calculate the speed of sound in air, water, or steel at any temperature. Includes unit conversion between m/s, ft/s, mph, and km/h.
Speed, Distance & Time Calculator
Calculate speed, distance, or time given the other two values. Supports multiple units.
Thermal Expansion Calculator
Calculate how much a material expands or contracts with temperature changes. Supports steel, aluminum, copper, and wood.
Thin Lens Equation Calculator
Solve the thin lens equation 1/f = 1/do + 1/di. Enter any two of focal length, object distance, or image distance to find the third.
Time Dilation Calculator
Calculate relativistic time dilation and length contraction from Einstein's special relativity. Enter velocity as a percentage of the speed of light.
Water Flow Rate Calculator
Calculate water flow rate through a pipe based on diameter, pressure, and pipe length. Results in GPM and LPM.
Wavelength Calculator
Calculate wavelength from frequency and wave speed. Supports light (speed of light) and sound waves. Shows results in meters, nanometers, and centimeters.
Weight on Other Planets Calculator
Enter your Earth weight to see what you would weigh on every planet in the solar system, plus the Moon and Sun.
Wind Chill Calculator
Calculate the wind chill (feels-like) temperature from air temperature and wind speed. Supports Fahrenheit/Celsius and mph/km/h.