Body Fat Percentage Calculator (US Navy Method)

Use this body fat percentage calculator (us navy method) for an approximate adult fitness calculation. Choose US units for pounds, inches or yards, or switch to metric. Results are estimates, not medical or training prescriptions.

Your Numbers

Sex

Body Weightkg

Heightcm

Neck Circumferencecm

Waist Circumference (at navel)cm

Hip Circumference (women only)cm

Results

Body Fat Percentage—

Fat Mass—

Lean Mass—

Input check—

Results update live as you type. Estimates only — not financial, tax, or investment advice.

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The Formula

Men: %BF = 495 ÷ (1.0324 − 0.19077·log₁₀(waist − neck) + 0.15456·log₁₀(height)) − 450

Understanding the Body Fat Percentage Calculator (US Navy Method)

Worked example: The default male example uses 176.4 lb body weight, 70.9 in height, 15.0 in neck and 33.5 in waist. Enter these approximate equivalents in US mode; small rounding differences affect the estimate.

This circumference equation estimates body composition; it is not a diagnosis or a substitute for measurement by a qualified professional. The female equation also uses hip circumference.

Frequently Asked Questions

How is the result calculated?

Men: %BF = 495 ÷ (1.0324 − 0.19077·log₁₀(waist − neck) + 0.15456·log₁₀(height)) − 450

What should I know about this estimate?

This circumference equation estimates body composition; it is not a diagnosis or a substitute for measurement by a qualified professional. The female equation also uses hip circumference.