Health Calculators

Predict how tall your child will be as an adult from both parents’ heights, with a likely range and an optional second estimate.

Find your total daily energy expenditure (maintenance calories) from your BMR and activity level, with targets for weight loss and gain.

Find how many calories a day to eat to lose, keep or gain weight at your chosen pace, with a time to goal and a target date.

Calculate heart rate from an ECG using the 300, 1500 or 6-second method.

Find your zone 2 heart rate and all five heart rate zones from your age.

Calculate your sleep debt from the hours you slept each night and see how long it takes to repay.

Find how many hours of sleep you need for your age and the best bedtimes for your wake-up time.

Calculate daily calories and macros for weight loss, maintenance or muscle gain.

Find how much water to drink a day from your weight, exercise and weather, in ounces, liters and cups.

Convert steps to miles and kilometers using your height or step length. See how far 10,000 steps goes, with a chart and steps per mile.

See your ideal body weight from four classic formulas, plus the healthy BMI range for your height.

Estimate your basal metabolic rate with two formulas and see daily calorie needs for each activity level.

Find your body mass index from height and weight in metric or US units, with the WHO adult category and a healthy weight range.

Enter your weight and goal to see how many grams of protein to eat each day, with a per-meal split and the calories from protein.