Health and fitness calculators
Pick a calculator. Each shows the answer as you type, with the steps underneath.
BMI calculatorBody mass index from height and weight, with the adult category and a healthy weight range.Open the calculator ›BMR calculatorCalories your body burns at rest, by the Mifflin-St Jeor and Harris-Benedict equations.Open the calculator ›TDEE calculatorMaintenance calories from your BMR and activity level.Open the calculator ›Calorie calculatorDaily calorie target to maintain, lose or gain weight.Open the calculator ›Calorie deficit calculatorHow fast you lose weight at a given daily calorie deficit.Open the calculator ›Macro calculatorTurn a calorie target and a split into grams of carbohydrate, protein and fat.Open the calculator ›Body fat calculatorEstimate body fat percentage from height, neck, waist and hip measurements.Open the calculator ›Ideal weight calculatorIdeal body weight from four classic formulas based on height.Open the calculator ›Protein calculatorDaily protein in grams from body weight and activity level.Open the calculator ›One rep max calculatorEstimate your one-rep max from a lift with several repetitions.Open the calculator ›Pace calculatorPace per kilometre and mile, speed and finish times for 5K to marathon.Open the calculator ›Heart rate calculatorMaximum heart rate and the five training zones by age.Open the calculator ›Due date calculatorEstimated due date from the first day of your last period.Open the calculator ›Conception calculatorEstimated conception date and fertile window from a due date.Open the calculator ›Ovulation calculatorEstimated ovulation date and fertile window from your cycle.Open the calculator ›Weight loss calculatorHow many weeks and what date to reach a goal weight at a steady weekly loss.Open the calculator ›Waist-to-hip ratio calculatorWaist-to-hip ratio and the WHO abdominal-obesity cut-off.Open the calculator ›Pregnancy weight gain calculatorRecommended total weight gain for one baby by pre-pregnancy BMI.Open the calculator ›
Health and fitness calculators
- BMI calculator
- BMR calculator
- TDEE calculator
- Calorie calculator
- Calorie deficit calculator
- Macro calculator
- Body fat calculator
- Ideal weight calculator
- Protein calculator
- One rep max calculator
- Pace calculator
- Heart rate calculator
- Due date calculator
- Conception calculator
- Ovulation calculator
- Weight loss calculator
- Waist-to-hip ratio calculator
- Pregnancy weight gain calculator
Method: standard arithmetic shown step by step; no outside data is used. Checked 2026-11-12.
Written by Calculators Free Editorial Team · Data checked 2026-11-12
About · How we verify this · Editorial policy · Corrections
About · How we verify this · Editorial policy · Corrections
General information only. Results are plain arithmetic on the numbers you enter; check anything important (money, health, school work) against your own records or the official source.