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Relative Fat Mass Calculator

Measured at navel level, relaxed, at the end of a normal breath out — use the same unit as height.
Worked example result
Relative fat mass (estimated body fat)22.1%
Waist-to-height ratio0.478

A man 180 cm tall with an 86 cm waist has an RFM of about 22.1% — and a waist-to-height ratio of 0.478, just inside the healthy below-0.5 zone.

RFM (men) = 64 − 20 × (height ÷ waist) · RFM (women) = 76 − 20 × (height ÷ waist) — same unit for both measurements · Powered by CalcHub — Relative Fat Mass Calculator