Body composition

Body-Fat % Estimate

A useful estimate from a tape measure. Relative Fat Mass uses height, waist circumference, and a gender reference to estimate body-fat percentage.

Three inputs

Height, waist and reference

Gender Reference

Estimated body fat

—%

Complete the inputs

Treat the number as an estimate and focus on changes measured consistently over time.

Calculation method

Relative Fat Mass (RFM)

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Understand the measure

What Relative Fat Mass adds

RFM uses waist in relation to height and was developed as a simple alternative estimate of whole-body fat percentage.

Its greatest value here is repeatability: use the same tape position and conditions, then follow the direction of change.

Formula used

Male RFM (%) = 64 − (20 × height cm ÷ waist cm)

Female RFM (%) = 76 − (20 × height cm ÷ waist cm)

Original RFM research