💪 Health & Fitness Calculators
Understand your body's numbers with easy health calculators for BMI, calories, and more. Educational estimates based on widely used formulas — not medical advice, but a useful starting point for a conversation with a professional.
Estimate adult resting energy expenditure with the Mifflin–St Jeor equation in metric or US customary units.
Open calculator →Compare estimated daily maintenance energy with planned average intake across a chosen number of weeks.
Open calculator →Estimate an exercise-specific one-repetition maximum from a 1–10-rep set with Brzycki and Epley equations.
Open calculator →Estimate an adult exercise heart-rate range with Tanaka age-predicted maximum and the heart-rate-reserve method.
Open calculator →Calculate your Body Mass Index from height and weight, in metric or imperial units, with your category.
Open calculator →Find how many calories you need each day to maintain, lose, or gain weight, based on your body and activity.
Open calculator →Estimate your body fat percentage from simple tape measurements using the US Navy method.
Open calculator →Work out your running pace per kilometre and mile, plus your speed, from a distance and time.
Open calculator →Estimate a healthy target weight for your height and sex using several established formulas.
Open calculator →Estimate your baby's due date from your last period, plus how many weeks pregnant you are and your trimester.
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