Health Calculators

Calculate your Body Mass Index (BMI) from weight and height. See your BMI category (underweight, normal, overweight, obese) and the healthy weight range for your height.

Estimate how much water you should drink each day based on body weight, exercise, and climate. Get your daily hydration goal in liters and cups.

Calculate your Basal Metabolic Rate with the Mifflin-St Jeor equation. See how many calories your body burns at rest based on weight, height, age, and sex.

Estimate your Total Daily Energy Expenditure from BMR and activity level. Get maintenance, cutting, and bulking calorie targets for any fitness goal.

Find your daily calorie target to reach a goal weight in a set timeframe. Works backward from your TDEE using the 7,700 kcal per kg rule.

Estimate body fat percentage from height, neck, waist, and hip measurements using the U.S. Navy formula. See your body fat category.

Estimate your one-rep max from any sub-max set using the Epley formula. Get a percentage load table for 95% down to 60% of your 1RM.

Calculate your max heart rate and five training zones using the Karvonen method. Personalize intensity by including your resting heart rate.