Health

Body Fat Percentage Calculator

Estimate body fat percentage with the Navy circumference method and see approximate fat mass and lean body mass.

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Measure with a flexible tape while standing relaxed. Small measurement errors can noticeably change the estimate.

How the Navy method estimates body fat

The Navy circumference method uses logarithmic formulas based on height and body measurements. It is useful when you do not have access to a scan, caliper test, or smart scale.

This calculator also estimates fat mass and lean mass from your body weight. These are planning estimates, not diagnostic measurements.

Method reference: this calculator uses the common Navy circumference equations for waist, neck, hip, and height measurements.

Estimated body fat

17.5%
Fitness range
Fat mass 30.6 lb
Lean mass 144.4 lb
Formula inputs Waist, neck, height
Method Navy circumference

Circumference formulas estimate body composition. For medical or athletic decisions, use a qualified professional and validated measurement method.

Body fat percentage, lean mass, and measurement accuracy

Measurement Technique

Keep the tape level and snug without compressing the skin. Measure the neck below the larynx, waist at the narrowest point or navel line, and hips at the widest point.

Lean Mass

Lean mass is total body weight minus estimated fat mass. It includes muscle, bone, organs, water, and other non-fat tissue.

Accuracy Limits

Tape formulas are convenient but not perfect. Hydration, posture, body shape, and tape placement can change the number.

How does the Navy body fat formula work?

The Navy method estimates body fat from height and circumference measurements. Men use waist, neck, and height; women use waist, hip, neck, and height.

Is this body fat estimate exact?

No. Tape measurements are convenient estimates. Results can shift with measurement technique, posture, hydration, and individual body shape.

What measurements do I need?

You need height, weight, neck, and waist. If the female formula is selected, the calculator also uses hip circumference.

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