Health and Fitness Calculators

Estimate the numbers behind your health goals: body mass index, basal metabolic rate and daily calorie needs. Quick estimates, not medical advice.

BMI Calculator

Work out your body mass index from your height and weight, and see your weight category.

Estimate your daily maintenance calories with the Mifflin-St Jeor BMR and activity level.

Estimate body fat percent from height, neck and waist using the US Navy tape method.

Find a target weight for your height with the Devine formula plus a healthy BMI range.

Divide waist by height to screen for central fat. Keep your waist under half your height.

Split a daily calorie target into protein, carb and fat grams by your chosen ratio.

Set a daily protein target from your body weight and activity goal, with a working range.

Estimate daily fluid from body weight and exercise, in litres and 250 ml glasses.

Estimate calories burned during exercise from activity, body weight and duration using MET values.

Find your max heart rate and fat-burn, cardio and peak training zones from your age.

Turn a run distance and finish time into pace per km, pace per mile and average speed.

Estimate your one-rep max from weight and reps with the Epley formula, plus training loads.

Estimate your due date with Naegele's rule and see your current pregnancy week and trimester.

Find the best times to sleep or wake based on 90-minute sleep cycles.