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Relative Fat Mass (RFM) Calculator

Estimate body fat from just height and waist

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Relative Fat Mass estimates body fat percentage from just two measurements: for men it's 64 − (20 × height ÷ waist), and for women 76 − (20 × height ÷ waist), both using consistent units (e.g., inches or cm) for height and waist circumference.

Published in 2018 as an alternative to BMI, RFM was designed specifically because BMI can't distinguish muscle from fat — a muscular athlete and a sedentary person of the same height and weight can get the same BMI but very different body fat. RFM's waist-based approach correlates more closely with DXA-scan body fat measurements, making it popular with trainers and researchers who want a quick, equipment-free estimate.

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