Health calculators
BMI and the calories you burn in a day.
BMI calculator
Enter your height and weight to get your BMI, the category it falls in, and the weight range considered healthy for your height.
TDEE calculator
Enter your details and activity level to see how many calories you burn in a day and where to set intake for slow, steady weight change.
Calorie deficit calculator
Enter where you are, where you want to be and the daily deficit you'll run to see the weekly rate, the number of weeks and the date you'd reach the goal.
Macro calculator
Enter your daily calories and pick a split, or set your own percentages, to see how many grams of protein, carbs and fat that comes to each day.
Running pace calculator
Enter how far you ran and how long it took to see your pace per mile and per kilometre, your speed, and the finish times that pace produces at race distances.
Body fat calculator
Enter your height, neck and waist (and hips for women) to estimate body fat percentage with the US Navy formula, and see your fat and lean mass.
About these calculators
Body numbers, explained plainly. BMI is a screening ratio, not a diagnosis, and the calculator says what its categories mean and where the ratio breaks down. The daily energy calculator uses the Mifflin-St Jeor equation, the one most dietitians use, and shows the activity multiplier it applied so you can see how much of the total is your baseline and how much is movement.
These are estimates for healthy adults. They are not medical advice, and anyone managing a condition or a pregnancy should work from their clinician's numbers rather than these.