Free health calculators

Four quick checks on your weight and shape, each with how it is worked out and the research behind it. Nothing you type leaves the page.

• BMI calculator

  Work out your BMI from your height and weight, see your band on the WHO scale or the lower scale NICE uses for Asian and other backgrounds, and the healthy weight range for your height.

• Calorie calculator

  Estimate the calories you burn each day from your age, sex, height, weight and activity, with the Mifflin-St Jeor equation, and what to eat to lose weight at a steady pace.

• Body fat calculator

  Estimate your body fat percentage from your height and a few tape measurements with the US Navy equations, and see your fat and lean mass.

• Waist-to-height ratio calculator

  Divide your waist by your height to check the fat around your middle against the healthy, increased and high bands in NICE’s 2025 guideline.