About the Body Fat Calculator
Estimate your body fat percentage with the US Navy method. This tool is free, works in your browser and needs no sign-up.
How to use the Body Fat Calculator
Measure your height, neck and waist in centimetres. Women also enter the hip measurement.
Formula used
The US Navy method uses a logarithm of your waist, neck, hip and height measurements.
Example
Measure at the same time of day and keep the tape snug but not tight for steady results.
Frequently asked questions
Is the Body Fat Calculator free to use?
Yes. It is completely free and you can use it as many times as you like.
How accurate is the Body Fat Calculator?
The calculator uses standard formulas, so the maths is exact. Real life results can differ because of fees, taxes, rounding or personal factors, so treat the answer as an estimate.
Do you store the numbers I enter?
No. All calculations run in your browser. The values you type are not sent to our server.
Disclaimer: results are estimates for information only. They are not financial, medical or professional advice.