What methods does this calculator use?

It provides estimates using the US Navy circumference method and a BMI-based formula (Deurenberg). Each gives a slightly different estimate; use consistent measurement technique for tracking.

Which measurements are required for US Navy method?

Men: neck, waist and height. Women: neck, waist, hip and height.

How accurate are these estimates?

These methods give useful estimates for tracking changes over time but are not clinical measurements. Accuracy varies with body shape and measurement consistency.

Body Fat Calculator

This calculator provides general body fat estimates for fitness tracking and differs from military or compliance-based body fat assessments.

Estimate Body Fat Percentage

Sex

Age (years)

Units

Weight (kg)

Height (cm)

Circumference measurements (for US Navy method)

Neck

Waist

Hip (female only)

Results

Enter measurements and press Calculate.

About body fat estimates

Two commonly used quick methods are shown: the US Navy circumference method and a BMI-based estimate. These are useful screening tools — they provide consistent, trackable estimates when you use the same measurement technique each time.

US Navy method

This method uses simple circumference measurements (neck, waist, and hip for women) together with height to estimate body fat percentage. It is quick and works well for tracking changes over time when measurements are taken consistently at the same anatomical points.

BMI-based estimate (Deurenberg)

The BMI-based formula estimates body fat from BMI, age and sex. It is less sensitive to local fat distribution but provides an alternative estimate that can help cross-check results.

Interpreting results

Body fat categories differ by sex and athletic goals. Typical adult ranges (approximate):

Male: Essential 2–5%*, Athletes 6–13%, Fitness 14–17%, Acceptable 18–24%, Overfat ≥25%
Female: Essential 10–13%*, Athletes 14–20%, Fitness 21–24%, Acceptable 25–31%, Overfat ≥32%

*Essential fat is required for normal physiological function. These categories are approximate; consult a professional when making clinical or athletic decisions.

How to measure

Measure circumferences snugly but not compressing the skin. For the waist, measure at the narrowest point or at the level of the navel — be consistent. Neck is measured below the larynx. For hip (women), measure at the widest part of the buttocks.