Formula guide

Body Fat Calculator formula

This tool uses a standard estimation formula that updates instantly as you change the inputs.

How the input values are used

Sex

The selected option determines the method or unit used.

Height (cm)

The numeric value in cm is used in the calculation; keep units consistent.

Neck circumference (cm)

The numeric value in cm is used in the calculation; keep units consistent.

Waist circumference (cm)

The numeric value in cm is used in the calculation; keep units consistent.

Hip circumference (cm, female only)

The numeric value in cm, female only is used in the calculation; keep units consistent.

How to interpret the result

  • The result uses Sex and Height (cm). Change one variable at a time to compare its effect on the outcome.
  • Health and fitness values are estimates, not a substitute for measurements or clinical advice.
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