Free Body Fat Calculator
Estimate body fat percentage from height and circumference measurements using the U.S. Navy method.
Body Fat Calculator
Enter a value to begin.
How to use this body fat calculator
- Choose the equation, then enter height, neck, waist and—where required—hip measurements taken in the same unit.
- Check the inputs and preview, then use the primary action.
- Download, copy or use the result shown by the tool.
How the result is calculated
The circumference method applies sex-specific logarithmic equations to height and measured circumferences. It is a screening estimate whose accuracy depends heavily on measurement technique.
Method source: U.S. Navy body-composition assessment guide.
All calculation and transformation work happens in this browser tab. No entered value is sent to an Noler Tools application server.
Important limitations
Results are provided for convenience and should be checked independently before an important decision. A format or checksum result never authenticates an identity, document, account, licence, vehicle or registration.
Health limitation: This is a general educational estimate, not medical advice, diagnosis or a substitute for care from a qualified clinician. Do not use it to make treatment, nutrition, pregnancy or emergency-care decisions.
Frequently asked questions
Is this body fat calculator free?
Yes. It is free to use and does not require an account.
Does Noler Tools save my input?
No. The input and result remain in temporary browser memory and are not uploaded or saved by this site.