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Body fat percentage calculator

Estimate body fat percentage from circumferences and see how small measurement differences may affect the result.

This tool provides an estimate for adults. It should not be interpreted during pregnancy or treated as a diagnosis or clinical measurement.

Circumference method

Enter your measurements

For comparable results, measure at the same locations and under similar conditions each time.

1. Formula

Select the formula that corresponds to your physiology. This choice only determines which equation is used.

2. Unit system
cm
How to measure

Measure without shoes, standing upright and looking ahead. Use your exact total height when available.

cm
How to measure

Place the tape below the larynx, angled slightly downward at the front, without compressing the skin.

cm
How to measure

Select a formula to view the correct measurement location.

kg

Used only to estimate fat mass and fat-free mass.

Publicidad

How to interpret the estimate

Tape-measure formulas are useful for tracking trends, but they are not a direct measurement of body composition.

Measure under similar conditions each time and focus on the trend. Hydration, tape placement, posture, and breathing can affect the result. Consult a qualified professional when clinical accuracy matters.

Frequently asked questions

How accurate is this calculator?

This is an estimate based on body circumferences and a population-derived formula. Measurement technique, fat distribution, and small differences in tape placement can change the result. It is not equivalent to a clinical measurement.

How should I measure my neck, waist, and hips?

Use a flexible tape without compressing the skin. Measure the neck below the larynx; the male formula uses the abdomen at navel level, while the female formula uses the natural waist and the widest part of the hips.

Why does a one-centimeter difference change the result?

The formula uses differences between circumferences, so a small change in the waist, neck, or hips can affect the estimate. The calculator shows a conservative ±1 cm sensitivity range.

Do I need to know my weight?

No. Weight is not used to calculate the percentage. It is only used to estimate fat mass and fat-free mass.

Is fat-free mass the same as muscle mass?

No. Fat-free mass includes muscle, water, bones, organs, and other tissues. This calculator does not estimate muscle mass.

Is this suitable for athletes?

It may be less accurate for high-performance athletes, bodybuilders, and people with high muscle mass or body-fat distributions unlike the population used to develop the formula.

Can it be used during pregnancy?

The formula should not be interpreted during pregnancy because physical changes mean circumferences no longer represent body composition in the same way.

Is this the same as BMI?

No. BMI relates weight to height; this tool uses circumferences to estimate what proportion of body weight is fat.

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