Health Calculators
Quick estimates for your health — each one explained in plain language.
BMI Calculator
BMI is a simple ratio of height to weight. It does not measure body fat and reads high in muscular people — treat it as a starting signal, not a verdict.
OpenBMR Calculator
BMR is the energy your body uses at complete rest — breathing, circulation and everything that keeps it running.
OpenTDEE Calculator
An estimate of the total energy your body uses in a day, including activity.
OpenCalorie Calculator
An estimate of the daily calories for maintaining, losing or gaining weight.
OpenIdeal Weight Calculator
A general weight range for your height. It is an estimate — body build differs from person to person.
OpenBody Fat Calculator
A rough estimate of body fat percentage from measurements. It is not as accurate as a clinical test.
OpenMacro Calculator
A general split of your daily calories into protein, carbohydrate and fat.
OpenWater Intake Calculator
A general estimate of how much water you need through the day.
OpenPregnancy Due Date Calculator
An estimated delivery date from your last period. It is only an estimate — the actual date is confirmed by ultrasound.
OpenWaist-Hip Ratio Calculator
A read on fat carried around the middle — often more informative than BMI alone.
OpenAge Calculator
Your exact age from your date of birth — in years, months and days.
OpenProtein Requirement Calculator
A general daily protein requirement based on weight and activity.
Open