Body Fat Calculator | Simple, Composition & Goal Modes

Estimate body fat with the US Navy method, review lean-vs-fat composition metrics, and plan target body-fat progress in goal mode.

When Should You Use This Calculator?

Tracking body fat percentage changes over time for fitness goals
Comparing body fat measurements across different time periods
Setting body fat goals and monitoring progress with historical data
Planning fitness strategies with persistent calculation history
Assessing body composition for health and athletic performance

Key Features:

Track progress over time with interactive charts
Three modes: Simple, Composition, and Goals
US Navy body-fat estimate with male/female measurement logic
Composition mode surfaces lean mass and fat mass estimates
Goals mode pairs target body-fat planning with progress sections

Frequently Asked Questions

Which method is more accurate: US Navy or BMI?

The US Navy method (using tape measurements) is generally more accurate than BMI because it accounts for body composition (waist/neck size) rather than just height and weight.

How do I measure my waist and neck?

Waist: Measure at the navel level. Neck: Measure just below the Adam's apple (larynx). Keep the tape snug but not tight. For hips (women), measure at the widest point.

Can I export my Body Fat Calculator calculations?

Yes! In guest mode, you can export your calculations to JSON format. Sign in is required for PDF and CSV export. Click the export button to download your results. This is perfect for record-keeping, sharing with others, or importing into other tools.

Does this calculator save my history?

Yes! Your calculation history is automatically saved. Guest users can save up to 50 calculations per workspace locally. Sign in for free to save up to 100 calculations per workspace, with access from any device when logged in.

Is this calculator free to use?

Absolutely! The Body Fat Calculator is completely free with no sign-up required. Create a free account to unlock additional features like more calculation history, multiple workspaces, and the ability to access your saved data from any device.

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