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Health Calculators/Body Fat Calculator

Body Fat Calculator

Estimate your body fat percentage, fat mass, lean body mass and waist-to-height ratio from a few tape measurements.

Body Fat Calculator

Understanding body fat

Body fat ranges

  • Men: athletes 6–13%, fitness 14–17%, average 18–24%
  • Women: athletes 14–20%, fitness 21–24%, average 25–31%
  • Obese: 25% or more (men), 32% or more (women)

Lean body mass

Lean mass is everything that is not fat: muscle, bone, organs and water. It is the number to protect while losing weight, and it sets your protein needs: about 2 g per kg of lean mass if you train.

Waist-to-height ratio

  • Divide your waist by your height, in the same units
  • Below 0.5: healthy for most adults
  • 0.5–0.6: increased health risk
  • 0.6 or more: high risk, worth discussing with a professional

Measuring correctly

  • Waist: at the navel, relaxed, after breathing out
  • Neck: just below the larynx
  • Hip (women): at the widest point
  • Measure in the morning, before eating

Good to know

Tape methods give an estimate. For a precise reading, a DEXA scan is the reference.

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