Health Calculators

Free sleep calculator. Find the best time to go to bed or to wake up, based on 90-minute sleep cycles and the time you take to fall asleep.

Use the following calculators to estimate the number of calories burned during certain activities based on either activity duration or distance

Free BMI calculator. Enter your height and weight in metric or imperial units to find your Body Mass Index and see your healthy weight range.

Free calorie calculator. Estimate how many calories you need each day to maintain, lose or gain weight, with three formulas and a calorie cycling plan.

Free body fat calculator. Estimate your body fat percentage with the U.S. Navy and BMI methods, and compare it with the ideal range for your age.

Free pregnancy calculator. Find your due date and week-by-week timeline from your last period, conception or due date, with trimesters and baby size.

Free BMR calculator. Estimate your basal metabolic rate and daily calorie needs by activity level with three trusted formulas, in calories or kilojoules.

Free ideal weight calculator. Find your ideal body weight from the Devine, Hamwi, Robinson and Miller formulas, plus the healthy BMI range for your height.

Free pace calculator. Work out your running pace, finish time or distance, convert pace to speed, and see race splits for common events.

Free Army body fat calculator. Estimate body fat with the Army tape-measure method and check your result against the Army standard for your age and sex.

Free lean body mass calculator (LBM) . Estimate lean mass, fat mass and body fat from weight and height with the Boer, James, Hume and Peters formulas.

This calculator computes a healthy body weight range based on a person's height and is most accurate for adults aged 18 or older.