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Body Fat Calculator

Estimate body fat percentage with the U.S. Navy tape-measure method.

Inputs

Results update as you edit.

in
in
in
in
lb

Estimated body fat

17.5%

Results update as the calculator inputs change.

This is an estimate only and is not a medical body-composition assessment.

Fat mass

29.8 lb

Lean mass

140.2 lb

Method

U.S. Navy tape

How to Estimate Body Fat With Tape Measurements

Tape Inputs
The U.S. Navy method uses circumference measurements such as neck, waist, and hip.
Sex-Specific Formula
The formula differs by sex because body-fat distribution differs on average.
Estimated Percentage
The result is an estimate, not a direct body composition measurement.

How to Use a Body Fat Estimate

Tape-measure formulas can help track changes when measured consistently. They are less precise than clinical methods, but they are convenient for monitoring trends.

What Affects Body Fat Estimates?

Measurement Site

Measure at the same anatomical points each time for consistency.

Tape Tension

Pulling the tape too tight or too loose can change the estimate.

Body Shape

Formulas estimate from averages and may not fit every body type.

Weight Context

Weight helps interpret composition trends alongside body-fat percentage.

Training Changes

Muscle gain and fat loss can move measurements differently than scale weight.

Method Limits

Clinical tools can be more appropriate when accuracy matters.

Body Composition Tracking Options

Tape Method

Use circumference measurements for a fast estimate.

Trend Tracking

Compare measurements over time instead of relying on one reading.

Clinical Testing

DEXA, Bod Pod, and professional assessments can provide deeper context.

Related Calculators

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Frequently Asked Questions

How accurate is the Navy body fat method?

It is a practical estimate. Accuracy depends on measurement consistency and how well the formula fits the individual.

Where should I measure?

Use the labeled sites in the calculator and measure consistently at the same points each time.

Should I flex or pull the tape tight?

No. Keep posture relaxed and tape snug but not compressing the skin.

Is body fat percentage better than BMI?

It gives different information. BMI screens weight relative to height, while body fat estimates composition.

Can this diagnose health risk?

No. Use it as a tracking tool and consult a qualified professional for health interpretation.