Men
- Very lean: below 6%
- Athletic: 6% to 13%
- Fit: 14% to 17%
- Average: 18% to 24%
- Above average: 25% and above
Free Navy-method body-fat calculator
Estimate body fat from measurements you can actually repeat.
Use the U.S. Navy method to estimate body fat percentage from circumference measurements, then use the result the right way: as a repeatable trend signal, not as a perfect laboratory truth. This page also shows lean mass, fat mass, and a rough checkpoint weight if lean mass stayed stable.
Best use case
Home tracking when you need something repeatable and better than scale weight alone.
Biggest caveat
This is an estimate from tape measurements, so consistency matters more than one exact number.
What to do next
Pair body-fat trends with calories, macros, and waist distribution instead of using one metric alone.
US Navy body-fat estimate
Use circumference measurements to estimate body fat and track trend direction.
This calculator uses the Navy method, which is good for repeatable home tracking when you measure the same way each time. It is more useful for progress trends than for pretending one decimal place is absolute truth.
Quick presets
Inputs
Height, weight, and circumference measurements
Sex
cm
kg
cm
Measure just below the Adam's apple at the narrowest point.
cm
Measure at the narrowest point, relaxed and not sucked in.
Your result
Enter your measurements to estimate body fat.
You will get a Navy-method body-fat estimate, lean mass, fat mass, and a rough checkpoint weight based on holding lean mass steady.
Next steps
Use body fat for context, not as the only metric.
This estimate gets stronger when it is paired with BMI, waist distribution, and a realistic calorie target.
Reading The Result
The estimate is useful when you read it as a range, not a verdict.
Body-fat estimates become more valuable when they guide decisions instead of feeding perfectionism. The bands below are practical reference points for interpreting the result, but they still need context from training, recovery, and general health.
Women
- Very lean: below 14%
- Athletic: 14% to 20%
- Fit: 21% to 24%
- Average: 25% to 31%
- Above average: 32% and above
Measurement Guide
The tape only helps if the measurement style stays the same.
The Navy method wins because it is practical. It loses value quickly when measurements drift. The goal is not “perfect technique once.” The goal is repeating a stable technique well enough that a 4-week trend means something.
01
Measure under the same conditions
Use the same tape, same time of day, and similar hydration status so the number is useful for trend tracking.
02
Keep the tape snug, not tight
If you pull the tape hard, the formula becomes less useful because your measurements stop being repeatable.
03
Relax the waist measurement
Do not suck your stomach in. The Navy method works better when the waist number is honest and measured consistently.
04
Track change, not perfection
A home estimate does not need to match a lab test to still be useful. It only needs to move in a believable direction over time.
Method Limits
A home estimate is still just one lens on body composition.
The Navy formula is better than guessing, but it still cannot tell you everything you probably want to know. It does not directly measure visceral fat, and it does not replace better tools when stakes are higher.
Use it to guide a plan, then check that plan against waist, photos, performance, and adherence.
What the Navy method does well
It is cheap, repeatable, and much more practical for home tracking than expensive lab methods. For most people, that repeatability is the main value.
What it does not know
It cannot see visceral fat directly, and it cannot perfectly account for unusual builds, large muscle mass, or measurement error.
How to use it well
Pair it with BMI, waist-to-hip ratio, progress photos, training performance, and a realistic calorie target instead of treating one percentage as the whole story.
Frequently Asked Questions
How accurate is the Navy method?
It is accurate enough for home trend tracking when you measure consistently, but it is still an estimate. The bigger win is repeatability over time, not pretending the decimal is perfectly exact.
Is body fat percentage better than BMI?
It is often more useful because it tries to separate fat mass from lean mass, but it is still not perfect. BMI is faster for screening. Body fat adds context. The two work better together than either one alone.
How often should I check body fat?
Every 2 to 4 weeks is usually enough. More frequent checks often create noise, especially if measurements are not taken under similar conditions.
What body-fat percentage should I aim for?
That depends on sex, training goals, and what you can maintain. A number that looks impressive but wrecks recovery or adherence is usually the wrong target.
Why are male and female ranges different?
Women naturally carry more essential body fat because of hormonal and reproductive requirements. That means healthy and athletic female ranges sit higher than comparable male ranges.
Research and reference notes
1. Hodgdon and Beckett (1984) Prediction of Percent Body Fat for U.S. Navy Men
Original Navy-method paper for estimating male body fat from circumference measurements.
2. Hodgdon and Beckett (1984) Prediction of Percent Body Fat for U.S. Navy Women
Original Navy-method paper for estimating female body fat from circumference measurements.
Comparison work between anthropometric prediction equations and DXA measurements.
4. ACSM Position Stand on Physical Activity and Body Composition
Professional guidance on body composition, activity, and intervention strategy.
5. NIH: Assessing Your Weight and Health Risk
Public-health guidance on weight, body composition, and health-risk screening context.