10 tools

Health Calculators

BMI, calories, body composition, hydration, pregnancy and sleep calculators.

Calculate Body Mass Index from U.S. or metric height and weight inputs.

Estimate daily calorie needs from age, sex, height, weight and activity level using Mifflin-St Jeor.

Estimate total daily energy expenditure from BMR and activity level.

Split daily calories into protein, carbs and fat using adjustable percentages.

Estimate body fat percentage using the U.S. Navy circumference method.

Estimate an ideal weight range from height using several common reference formulas.

Estimate daily water intake from body weight and activity time.

Estimate a pregnancy due date from the first day of the last menstrual period.

Estimate ovulation and fertile-window dates from cycle timing.

Plan wake or bedtime options around 90-minute sleep-cycle estimates.