Body Fat Calculator (US Navy Method)
Estimate body fat percentage using the US Navy circumference method — measure waist, neck, height (and hip for women). No calipers needed. ±3-4% accuracy vs DEXA scan.
What powers the Body Fat Calculator (US Navy)
US Navy circumference formula (most-cited consumer method)
Male / female variants
Metric (cm / kg) or imperial (in / lb)
Output: body fat %, fat mass, lean mass, BMI
Category labels (essential, athlete, fitness, average, obese)
Why the Body Fat Calculator (US Navy) is different
Browser-native
The Body Fat Calculator (US Navy) runs entirely in your browser. Input is processed locally — never uploaded, never logged, never cached anywhere outside your device.
No artificial limits
No daily quotas, no character ceilings, no "upgrade for more" walls. Every feature is the complete feature — the same on the first use as the thousandth.
Production-grade quality
Built to the same engineering bar as paid SaaS tools — accurate algorithms, audited logic, responsive design and accessibility-tested interactions.
Common use contexts
- Body recomposition progress tracking
- Fitness goal setting
- Reference for weight-loss diet planning
- Quick alternative to BMI for athletic builds
Private and secure
Zero upload
All processing happens in your browser. Input is never transmitted, logged or cached.
Works offline
Once the page loads, the tool runs without an internet connection. No network calls happen during use.
No tracking
No accounts, no cookies for tool state. Only aggregate analytics count visits at the page level.