10 tools

Health & Fitness tools

Health calculators: BMI, BMR, running pace and more. Not medical advice.

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Calculate BMI with Japanese (JASSO) and WHO classifications.

Standard (BMI 22), beauty, Broca, Lorentz, and Devine ideal-weight estimates.

Estimate max HR from age (Fox / Tanaka) and 5 training zones; optional Karvonen.

Suggest bedtimes or wake times from ~90-minute sleep cycles.

Mutually calculate running pace, distance, and finish time (km / miles).

Estimate daily calorie needs (TDEE) from Mifflin–St Jeor BMR × activity.

Estimate body fat % (US Navy + BMI). Not medical advice.

Estimate protein / fat / carb split from calories.

Estimate due date and gestational age (Naegele).

Estimate ovulation and fertile window from LMP.