Health Calculators
These health calculators estimate the numbers behind nutrition and body-composition goals: your BMI and healthy weight range, your basal metabolic rate and total daily energy expenditure (TDEE), the daily calories needed to maintain, lose, or gain weight, body fat percentage from a tape measure, and a daily protein target based on your weight and activity. For expecting parents, the Pregnancy Calculator tracks progress week by week and shows when a test can give a reliable result.
Every calculator uses a published formula, such as Mifflin-St Jeor for metabolic rate and the US Navy circumference method for body fat, and each page lists its sources and when it was last updated. The results are population-based estimates, not a diagnosis. Individual bodies vary, so talk to a doctor or registered dietitian before making significant changes to diet, training, or prenatal care.
- Pregnancy Calculator
Track pregnancy week by week from your due date or last period.
- BMR Calculator
Calculate your basal metabolic rate using the Mifflin-St Jeor formula.
- Calorie Calculator
Calculate your daily calorie needs to maintain, lose, or gain weight.
- Body Fat Calculator
Estimate body fat percentage using the US Navy tape-measure method.
- Protein Calculator
Calculate your daily protein target based on goal and activity level.
- Macro Calculator
Get daily grams of protein, carbs, and fat for your calorie goal and diet style.
- Ovulation Calculator
Estimate your ovulation date, fertile window, and next periods from your cycle.
- BMI Calculator
Calculate your body mass index and find the healthy weight range for your height.
- TDEE Calculator
Find your total daily energy expenditure at every activity level, with loss and gain targets.