Body Fat Calculator

Estimate body fat percentage from a few tape measurements using the US Navy method.

Men: at the navel. Women: at the narrowest point.
Estimated body fat18.0%

How it works

The US Navy formula estimates body fat from height and circumference measurements using logarithms (inches).

Men: 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76.

Women: 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387.

Tips

  • Measure in the morning before eating, with the tape snug but not squeezing.
  • Take each measurement twice and use the average.

Frequently asked questions

How accurate is the Navy method?

It's a convenient estimate. Measure consistently (same time of day, relaxed, tape snug but not tight) to track changes over time.

For general information only. Not medical advice — talk to a doctor or other qualified professional about your health.

You might also like

BMI CalculatorBody Mass Index from your height and weight.Calorie Calculator (TDEE)Daily calories to maintain, lose or gain weight.Pregnancy Due Date CalculatorEstimated due date from your last period.Love CalculatorType two names, get a totally unscientific love score.Fair Rent Split CalculatorSplit rent with roommates by bedroom size.Mortgage CalculatorMonthly payment with taxes, insurance and HOA included.