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Body Fat Percentage Calculator

Estimate Body Fat Using Navy Method

Gender

Age

Weight (kg)

Height (cm)

Waist (cm)

Neck (cm)

U.S. Navy Method Formula

Men: BF% = 495 / (1.0324 - 0.19077×log(waist-neck) + 0.15456×log(height)) - 450

Women: BF% = 495 / (1.29579 - 0.35004×log(waist+hip-neck) + 0.22100×log(height)) - 450

Log is base 10

Body fat percentage estimates your body composition and fitness level.

⚠ This is an estimate. For accurate measurement, use DEXA, hydrostatic weighing, or calipers from a trained professional.

What Is Body Fat Percentage?

Body fat percentage is the proportion of your total body weight that is composed of fat tissue. It includes essential fat (for life functions) and storage fat (energy reserve).

Essential Fat

Men 2-5%, Women 10-13%. Required for normal physiological function.

Athletic Range

Men 6-13%, Women 14-20%. Typical of athletes and very fit individuals.

Fitness Range

Men 14-17%, Women 21-24%. Good fitness and health.

Obesity

Men ≥25%, Women ≥32%. Increased health risks.

Teaching Example: Male, 175cm, waist 80cm, neck 40cm. BF%≈15-18% (fitness range).

Applications

Fitness Tracking Body Recomposition Weight Loss Progress Health Assessment Athletic Performance

Frequently Asked Questions

Navy method formula?▼

Men: BF=495/(1.0324-0.19077×log(waist-neck)+0.15456×log(height))-450. Women: BF=495/(1.29579-0.35004×log(waist+hip-neck)+0.22100×log(height))-450.

Healthy body fat ranges?▼

Men: Essential 2-5%, Athletic 6-13%, Fitness 14-17%, Acceptable 18-24%, Obesity ≥25%. Women: Essential 10-13%, Athletic 14-20%, Fitness 21-24%, Acceptable 25-31%, Obesity ≥32%.

Why measure body fat?▼

BMI doesn't distinguish muscle vs fat. Body fat % is a better indicator of health and fitness progress.

How to measure?▼

Waist at navel, neck just below larynx, hips at widest. Consistent measuring is key for tracking.

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