Body Fat Calculator
Estimate body fat percentage using the US Navy method.
Interactive calculator
Result
Body fat
17.51%
What it is
The US Navy body fat formula uses tape measurements to estimate body fat percentage. It's not as accurate as DEXA but it's free and consistent.
The formula
US Navy Method: Men: 86.01·log10(waist−neck) − 70.041·log10(height) + 36.76 Women: 163.205·log10(waist+hip−neck) − 97.684·log10(height) − 78.387
Why it matters
Understanding body fat calculator helps you make a better-informed decision before you commit money or time.
Worked examples
Try the example
Use the defaults above as a starting point — then adjust the inputs to match your situation.
Common pitfalls
- Double-check the units on every input — most errors come from mixing units.
- Round at the end, not in the middle of the formula.
Frequently asked questions
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