Health & Fitness

Know your numbers.

Evidence-based estimates for body composition, energy needs and hydration. Guidance only — not a substitute for professional medical advice.

BMI Calculator

Body Mass Index with the standard WHO category for your result.

Measurements

Units

Height (cm)

Weight (kg)

Calorie & BMR Calculator

Mifflin–St Jeor BMR and daily energy needs by activity level.

About you

Sex

Age

Height cm

Weight kg

Activity level

Ideal Weight Calculator

Healthy-weight estimates from the Devine, Robinson and Hamwi formulas.

Inputs

Sex

Height (cm)

Body Fat Calculator

Estimated body-fat percentage using the U.S. Navy circumference method.

Measurements (cm)

Sex

Height

Neck

Waist

Age Calculator

Your exact age in years, months and days — plus a few fun totals.

Dates

Born on

Age at date

Water Intake Calculator

A daily hydration target based on body weight and activity.

Inputs

Weight (kg)

Exercise (minutes/day)

Heart Rate Zones

Training zones from age and resting heart rate.

Profile

Age

Resting HR

Pregnancy Due Date

Estimate due date from last menstrual period (LMP).

LMP

Last period start

Age Difference

Exact gap between two dates of birth.

Dates

Person A

Person B

Retirement Age Calculator

When you turn a target age.

Birthday

Date of birth

Target age