Body Fat Calculator

Estimate your body fat percentage using the scientifically validated US Navy Body Fat Formula.

How Body Fat Percentage Is Calculated

This calculator uses the US Navy Method, which is one of the most widely used body fat estimation formulas due to its reliability and simplicity.

Formula (US Navy)

Men:

BF% = 495 / (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450

Women:

BF% = 495 / (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.22100 × log10(height)) − 450

Body Fat Categories

  • Athletes: 6–13% (men), 14–20% (women)
  • Fitness: 14–17% (men), 21–24% (women)
  • Average: 18–24% (men), 25–31% (women)
  • Obese: 25%+ (men), 32%+ (women)

Input Rules & Limits

  • Height: 100–250 cm
  • Neck: 20–60 cm
  • Waist: 40–200 cm
  • Hip (women only): 50–200 cm

Frequently Asked Questions

It is considered highly reliable for general estimates.
Women's fat distribution requires an extra measurement for accuracy.
Men: 12–20%, Women: 20–28% for general health.