Health and fitness

BMI, calories, pace and pregnancy calculators. Estimates, not medical advice.

• BMI Calculator Calculate your adult body mass index in metric or imperial units, see the WHO BMI category and the weight range for a BMI of 18.5 to 24.9.
• BMR Calculator Estimate your basal metabolic rate with the Mifflin-St Jeor and revised Harris-Benedict equations, in metric or imperial units, with every step shown.
• Body Fat Calculator Estimate your body fat percentage from height, neck, waist and hip measurements with the US Navy formula, in centimetres or inches.
• Calories Burned Calculator Estimate calories burned during walking, running, cycling, swimming, sports or housework from your weight and the duration, using 2024 Compendium MET values.
• Heart Rate Zone Calculator Calculate your five heart rate training zones in bpm from your age, resting heart rate or measured max heart rate, with the Tanaka and Karvonen formulas.
• Ideal Weight Calculator Compare ideal body weight from the Devine, Robinson, Miller and Hamwi formulas with the healthy BMI range for your height, in kg or lb.
• Macro Calculator Split your daily calories into protein, carbohydrates and fat. See grams and calories for each macro, compared with the official reference ranges.
• One-Rep Max Calculator Estimate your one-rep max from a set of reps with the Epley, Brzycki, Lombardi and four other formulas, and get training loads from 50 % to 100 % of 1RM.
• Ovulation Calculator Estimate your ovulation date and fertile window from your last period and cycle length. An estimate for planning, never a method of contraception.
• Pregnancy Due Date Calculator Estimate your pregnancy due date with Naegele's rule from your last period and cycle length, or from the conception or IVF transfer date.
• Pregnancy Week Calculator Find out how many weeks and days pregnant you are, your trimester and the days left to your due date, from your last period, conception, IVF or due date.
• Running Pace Calculator Calculate your running pace, finish time or distance in km or miles, see predicted 5K, 10K, half marathon and marathon times, and print split tables.
• Sleep Need Calculator Find the recommended hours of sleep for your age, compare them with how long you actually sleep and estimate your weekly sleep debt. Free, private, no sign-up.
• Steps to Distance Converter Convert steps to kilometres or miles, or a distance to steps, with a step length estimated from your height or measured. See how far 10,000 steps is.
• TDEE and Daily Calorie Calculator Estimate your total daily energy expenditure (TDEE) and maintenance calories from your BMR and activity level, in metric or imperial units.
• Water Intake Calculator Estimate how much water to drink per day from the EFSA and IOM reference intakes, with rough extras for exercise and hot weather.