📏 Body Fat Percentage Calculator
U.S. Navy circumference method — just a measuring tape needed.
How This Is Calculated
This uses the U.S. Navy circumference method, which estimates body fat from a few tape measurements rather than requiring calipers or scans. Men need neck, waist, and height; women additionally need hip circumference.
Frequently Asked Questions
How accurate is the Navy method?
It's reasonably accurate for most people (typically within a few percentage points of more precise methods
like DEXA scans), though it can be less accurate for very lean or very muscular individuals.
Guide: understanding your result
- This calculator uses the U.S. Navy circumference method, which estimates body fat from height, neck and waist (and hip for women) measurements.
- Tape-measure methods are estimates; results typically differ by several percentage points from lab methods such as DEXA.
- Body fat percentage is one indicator among many and is not a diagnosis.
Commonly cited body fat ranges (ACE)
| Category | Women | Men |
|---|---|---|
| Essential fat | 10–13% | 2–5% |
| Athletes | 14–20% | 6–13% |
| Fitness | 21–24% | 14–17% |
| Average | 25–31% | 18–24% |
| Obese | 32%+ | 25%+ |
Common mistakes to avoid
- Measuring at a different spot each time — measure at the same place, same time of day.
- Pulling the tape too tight.
Frequently asked questions
How accurate is the Navy method?
It is reasonably consistent for tracking change over time, but individual results can be off by several points. For medical decisions, consult a healthcare professional.
Official sources
Examples are calculated live from the same data the calculator uses and are for education only — they are not financial, tax or investment advice.
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