Health Calculators
Take charge of your wellness with science-backed health and fitness calculators. Compute your BMI, daily calorie needs, body fat percentage, ideal sleep windows and more — all using validated formulas from peer-reviewed research.
BMI Calculator
Calculate your Body Mass Index in metric or imperial units. See healthy weight range and category.
Open calculatorCalorie Calculator (TDEE)
Calculate your daily calorie needs for weight loss, maintenance or muscle gain using Mifflin-St Jeor.
Open calculatorBMR Calculator
Calculate your Basal Metabolic Rate using three formulas: Mifflin-St Jeor, Harris-Benedict and Katch-McArdle.
Open calculatorBody Fat Calculator
Calculate body fat percentage using the U.S. Navy method or Jackson-Pollock 3-site skinfold method.
Open calculatorSleep Cycle Calculator
Find the best bedtime or wake time based on 90-minute sleep cycles to wake up refreshed.
Open calculatorPregnancy Due Date Calculator
Calculate your estimated due date by LMP, conception date, IVF transfer or ultrasound.
Open calculatorOvulation Calculator
Predict your ovulation date and 6-day fertile window. Includes 6-month fertility calendar.
Open calculatorWater Intake Calculator
Calculate your daily water needs based on weight, activity level, climate and life stage.
Open calculatorOne Rep Max (1RM) Calculator
Estimate your one rep max for any lift using four formulas plus training percentage table.
Open calculatorMacro Calculator
Calculate daily protein, carbs and fat for your goals. Supports keto, low-carb and standard diets.
Open calculator