Health and Fitness Calculators
Is your weight right for your height, how many calories and how much water do you need, what heart rate should you train at? The numbers about your body, in one place.
- BMI CalculatorEnter your height and weight to see your body mass index and the healthy weight range for your height.
- Ideal Weight CalculatorChoose your sex and enter your height to see your ideal weight from four well-known formulas.
- Body Fat CalculatorAll you need is a tape measure: enter your neck and waist to estimate your body fat percentage.
- Calorie CalculatorHow many calories should you eat a day? See what it takes to maintain, lose or gain weight.
- Protein CalculatorEnter your weight and pick your goal to see how many grams of protein you need a day.
- Water Intake CalculatorEnter your weight and daily exercise to see how much water you should drink a day.
- Calories Burned CalculatorPick an activity, enter your weight and the duration to see how many calories you burned.
- Heart Rate CalculatorEnter your age and resting heart rate to see the heart rate range to train in.
- Pace CalculatorEnter the distance you ran and your time to see your pace and race predictions.
- Due Date CalculatorEnter the first day of your last period to see your estimated due date and how far along you are.
- Sleep CalculatorEnter the time you need to wake up and see when to go to bed to wake feeling rested.
How can you tell whether your weight suits your height?
The most widely used measure is body mass index (BMI): weight in kilograms divided by height in metres squared, with 18.5 to 24.9 considered healthy for adults.
BMI cannot tell fat from muscle, so body fat percentage gives a more detailed picture. The ideal weight calculator compares four formulas for your height and sex.
How many calories, how much protein and water do you need a day?
Daily calorie needs are your basal metabolic rate multiplied by your activity level; protein is calculated in grams per kilogram of body weight and water in millilitres per kilogram.
The calorie calculator also gives targets for losing or gaining weight, and the calories burned calculator shows the energy used walking, running, cycling and more.
Calorie CalculatorProtein CalculatorWater Intake CalculatorCalories Burned Calculator
Which calculations help with exercise, sleep and pregnancy?
Target heart rate depends on your age and resting heart rate, running pace on distance and time, and the best bedtime on 90-minute sleep cycles.
The due date calculator estimates the due date and how many weeks pregnant you are from the last period.
Heart Rate CalculatorPace CalculatorSleep CalculatorDue Date Calculator
Frequently Asked Questions
Do these calculators replace medical advice?
No. Results are general information; talk to your doctor or dietitian about decisions that affect your health.
Which formulas are used?
Each page names its formula, such as the Mifflin–St Jeor equation for calories and the U.S. Navy method for body fat.
Is my height or weight stored?
No. Calculations run in your browser and nothing is sent to the server.