⚕️ Health

Health Calculators

BMI, calories, hydration, heart rate zones, alcohol units and more — all using NHS-aligned guidance.

All Health Calculators

Body Mass Index with NHS weight categories — metric and imperial (stones & lbs).

Calorie Calculator (BMR/TDEE)

Daily calorie needs for weight loss, maintenance or muscle gain using the Mifflin–St Jeor equation.

Your healthy weight range from height — BMI range plus Devine, Robinson and Hamwi formulas.

Daily hydration target based on weight, exercise and climate.

Heart Rate Zones

Max heart rate and five training zones — fat burn through to peak performance.

Units in any drink and how your week compares to the NHS 14-unit guideline.

Pregnancy Due Date

Estimated due date from your last period — plus current week and trimester.

Sleep Cycle Calculator

Best bedtimes and wake times based on 90-minute sleep cycles — wake refreshed.