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Free Body Fat
Calculator

Free advanced Body Fat Calculator comparing the U.S. Navy circumference equation, Relative Fat Mass and Deurenberg BMI-age-sex estimate, with fat mass, fat-free mass, target-body-fat scenarios, measurement sensitivity and measured body-fat comparison.

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About Free Body Fat Calculator

Run the legacy U.S. Navy circumference equation, Relative Fat Mass and the adult Deurenberg BMI-age-sex equation from one set of inputs. Then inspect fat mass, fat-free mass, target-body-fat scenarios, tape-measure sensitivity and optional comparison with a measured body-fat result.

Workspace options

  • Formula sex
  • Age
  • Height cm
  • Weight kg
  • Waist / abdomen cm
  • Neck cm

Available actions

  • Metric
  • US / Imperial
  • Copy body-fat report
  • Export CSV
  • Reset