Health tools
Health and Fitness Calculators
Estimate calorie needs, body metrics, training targets and nutrition splits with careful health disclaimers and plain formula notes.
11 calculators
Use these estimates as starting points for training, nutrition and body measurements, with clear limits where health context matters.
HealthCaloriesEstimate daily maintenance calories using the Mifflin-St Jeor equation and an activity multiplier.HealthMacrosSplit daily calories into protein, fat and carbohydrate targets using body weight and preferred fat percentage.HealthBMICalculate adult body mass index from height and weight, with standard category ranges.HealthPaceCalculate running pace, finish time or distance from any two values.HealthBody FatEstimate body fat percentage from circumference measurements using the US Navy method.HealthBMREstimate basal metabolic rate using the Mifflin-St Jeor equation.HealthOne Rep MaxEstimate one rep max and training percentages from weight lifted and reps completed.HealthHeart ZonesEstimate maximum heart rate and training zones from age and resting heart rate.HealthWater IntakeEstimate daily fluid needs from body weight, activity and warm conditions.HealthDue DateEstimate a pregnancy due date from the first day of the last menstrual period.HealthWaist Hip RatioCalculate waist-to-hip ratio from body measurements.
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