Health & fitness tools
Body, training and sleep calculators with the formulas shown.
- BMI Calculator Calculate your body mass index in metric or US units, see the WHO category and the healthy weight range for your height.
- Calorie Calculator (TDEE) Estimate how many calories you burn per day (TDEE) with the Mifflin-St Jeor equation, plus targets to maintain, lose or gain weight steadily.
- Sleep Calculator Find the best time to go to bed or wake up so you finish complete 90-minute sleep cycles and wake up feeling less groggy.
- Water Intake Calculator Estimate how much water to drink each day from your weight, exercise and climate, in litres, glasses and ounces.
- Body Fat Calculator (US Navy Method) Estimate body fat percentage from height, neck, waist and hip measurements using the US Navy formula, with fat and lean mass.
- Macro Calculator Split a daily calorie target into protein, carbohydrate and fat grams using a balanced, higher protein or lower carb ratio.
- Running Pace Calculator Work out running pace per km or mile from distance and time, or predict a finish time for 5K, 10K, half marathon and marathon.
- One Rep Max Calculator Estimate your one rep max from any set of up to 12 reps using the Epley, Brzycki and Lombardi formulas, with a percentage training table.
- Ideal Weight Calculator Compare ideal body weight estimates from the Devine, Robinson, Miller and Hamwi formulas alongside the healthy BMI range for your height.
- Pregnancy Due Date Calculator Estimate your baby’s due date from the first day of your last period or the conception date, with current week and trimester dates.