Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method — no calipers needed.
100% client-side · no upload
Body Fat Percentage
How to use
- Select your biological sex. Women will see an additional hip measurement field.
- Measure and enter your height, neck circumference (at larynx), and waist (at navel).
- Click Calculate Body Fat to see your estimated percentage and category.
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- BMR Calculator — daily calorie burn estimate
- Ideal Weight Calculator — healthy weight range by height
- Macro Split Calculator — set protein, carb, and fat targets
- Water Intake Calculator — daily hydration by weight
常见问题
- Is this body fat calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.