Health calculators
BMI, calories, body fat, pregnancy and more. 15 tools
Most popular
BMI
Calculate your body mass index and see which weight category it falls into.
Body Fat
Estimate your body fat percentage from a few tape-measure readings using the U.S. Navy method.
Macro
Split a daily calorie target into grams of protein, carbohydrate and fat for your goal.
Ovulation
Predict your ovulation day, fertile window and next period from your last period and cycle length.
Pregnancy Due Date
Estimate your baby’s due date from the first day of your last period or the date of conception, and see how far along you are.
TDEE
Estimate how many calories you burn per day and the intake needed to lose, keep or gain weight.
More health tools
Blood Alcohol (BAC)
Get a rough estimate of blood alcohol concentration with the Widmark formula. For education only — never use it to decide whether to drive.
BMR
Estimate your basal metabolic rate — the calories your body burns at complete rest.
Calories Burned
Estimate how many calories you burn during walking, running, cycling, swimming, lifting and other activities.
Ideal Weight
See your ideal body weight by the Devine, Robinson, Miller and Hamwi formulas, plus the healthy BMI range for your height.
Protein Intake
Find how many grams of protein you need per day based on your weight and activity.
Sleep
Find the best time to go to bed or wake up so you finish complete 90-minute sleep cycles.
Waist-to-Height Ratio
Check your waist-to-height ratio, a simple measure of central body fat linked to heart and metabolic risk.
Water Intake
Estimate how much water to drink each day based on your weight, exercise and climate.
Weight Loss Goal Date
Find out when you could reach your goal weight with a steady daily calorie deficit.