GlenCalc

Body fat calculator

The US Navy method estimates body fat from a few tape measurements. It needs only a tape measure and is accurate to within a few percentage points for most people.

These formulas were fitted separately for men and women.

Just below the larynx, tape sloping slightly down to the front.

Men: at the navel. Women: at the narrowest point.

Your answer

Body fat17.5 %Fitness
Fat mass29.8 lb
Lean mass140.2 lb
  • An estimate for general information, not medical advice.

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How we worked it out

Updated as you change the numbers.

  1. Body fat % = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76, in inches: 86.010 × log10(19) − 70.041 × log10(70) + 36.76 = 17.5%.

Method and assumptions

These are the circumference equations used by the US Navy (Hodgdon and Beckett, 1984), in inches. The categories are the American Council on Exercise ranges. Measure on bare skin, relaxed, and take the average of three readings.

Questions

What body fat percentage is healthy?

The American Council on Exercise rates about 14 to 24% as fit to average for men and 21 to 31% for women.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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