Body Fat Calculator

Estimate body fat percentage with the US Navy circumference method. All you need is a soft measuring tape — no calipers, no scales.

General information, not a diagnosis or treatment plan. Do not change medication, diet or training based on this result — discuss it with a qualified healthcare professional. Read the full disclaimer.

Gender Height (cm) Neck (cm) Measure just below the larynx. Waist (cm) Men: at the navel. Women: narrowest point. Weight (kg) — optional Used to estimate fat and lean mass.

Your estimated body fat

Athletic

10.6%

You are in the athletic range for men — a strong power-to-weight ratio for hiking.

What to pay attention to

Keep protein at 1.2–1.6 g per kg to hold muscle on long trips.
Do not go lower without professional guidance; performance often drops.

Estimates from circumference measurements are typically within ±3–4%. Not medical advice.

My Progress

Next stepBMI calculator Calorie needs

Fat mass8kg

Lean mass67.1kg

BasisUS Navy method

How to measure correctly

Measure in the morning, before eating, with the tape flat against the skin.
Keep the tape snug but not compressing the skin.
Take each measurement twice and use the average.
Men: waist at the navel, neck below the larynx.
Women: waist at the narrowest point, hips at the widest point.

Reference ranges differ by sex. For men, roughly 6–17% is athletic to fit; for women, 14–24%. Essential fat is higher for women, so do not compare numbers across sexes.