Health & Fitness Calculators

BMI, calories, body fat and training numbers — all sharing one profile.

12 calculators. Your details are shared across all of them.

BMI Calculator

Work out your Body Mass Index, see which WHO category it falls in, and get your healthy weight range.

Your Basal Metabolic Rate — the energy your body burns at complete rest, before any activity.

Total Daily Energy Expenditure — everything you burn in a day, plus calorie targets for losing or gaining weight.

Estimate body fat percentage with the US Navy tape method, plus fat mass and lean mass.

Your ideal body weight by four published formulas, alongside the BMI-based healthy range.

Daily calorie targets for losing, maintaining or gaining weight, based on your own metabolism.

Split a calorie target into protein, carbohydrate and fat, in grams per day.

How much of your weight is muscle, bone, organs and water rather than fat.

Your five training zones from maximum and resting heart rate, using the Karvonen method.

How much water to drink per day, adjusted for your bodyweight and exercise.

Convert distance and time into pace and speed, with split times for standard race distances.

Estimate a due date from your last menstrual period, with trimester dates and current progress.