Health & Fitness

Body, fitness and wellbeing calculators.

8 tools

Body Fat % (US Navy Method)

Estimate body fat percentage from neck, waist (and hip) measurements.

Daily Water Intake Estimator

Suggested daily water intake from body weight and exercise minutes.

Heart Rate Training Zones

Five training zones from your age and (optional) resting heart rate.

Pregnancy Due Date Estimator

Estimate due date from last menstrual period using Naegele's rule.

Running Pace Calculator

Pace, finish time, splits and km↔mile pace conversion.

Sleep Cycle Calculator

When to fall asleep (or wake up) to align with 90-minute sleep cycles.

TDEE & Macro Calculator

BMR / TDEE from Mifflin-St Jeor plus a configurable macro split.

VO₂ Max Estimator

Estimate VO₂ max from Cooper or Rockport submaximal tests.

An unhandled error has occurred. Reload ×