Question
What this calculator answers
This page helps you estimate body fat percentage with the U.S. Navy method so you can compare a measurement-based result against BMI or waist ratio rather than relying on weight alone.
Health toolBody fat estimate
Navy Body Fat Calculator
Use this navy body fat calculator when you want a measurement-based estimate of body fat percentage instead of a weight-only screen. It is useful when you want a practical answer to how much of your body weight may be fat, especially if you are comparing progress over time or checking a fitness estimate alongside BMI. Body fat percentage is usually more useful than BMI for fitness tracking because it looks at composition, not just weight.
Updated: April 27, 2026
What you will get
Clear input, result, and explanation in one place
Body fat estimate
The result shows an approximate body fat percentage and body-fat mass estimate using the U.S. Navy method.
This page uses the U.S. Navy circumference method and should be treated as an adult screening estimate only.
How it works
Navy method in plain language
The formula uses waist, neck, height, and hip measurements where relevant. That makes it a practical screening estimate for adults who want a clearer composition view.
Calculator
Enter your values and review the result
Inputs
Calculate to update the resultBody fat estimate panel
Enter sex, age, height, weight, waist, neck, and hip measurements to estimate body fat using the Navy method.
Hip measurement is hidden for male calculations and is not used in the formula.
The calculator uses the U.S. Navy circumference method and is intended for adults. Results depend on measurement quality and should be read as estimates.
Result
Body fat estimate
LEAN
Body fat interpretation
Body fat
11.6
Body fat mass
9.3 kg
Lean body mass
70.7 kg
Healthy reference
8–19%
Fat to target midpoint
Already near the reference midpoint
What this means
This is a lean adult range for many men and is often used as a fitness reference.
It sits at or below the age-based reference midpoint, so the most useful next step is usually maintaining the routine that produced it.
The primary estimate uses the U.S. Navy circumference method. Keep measurement conditions consistent if you want to compare results over time.
What your body fat percentage means
Athletesfitness range
This is a fitness-oriented result for many adults. It often aligns with regular training and a composition-focused routine.
Example
Example calculation
If you are 178 cm tall, weigh 82 kg, and take consistent waist and neck measurements, the calculator estimates body fat percentage from those measurements instead of from weight alone. That makes it easier to compare progress across time.
Interpretation
What the result means
The percentage estimate is most useful as a comparison tool. A lower number is not automatically better, but a lower trend can signal changing composition when the measurements are taken the same way each time.
Next step
What to do next
If the result is higher than expected, compare it with BMI, waist ratio, and calorie planning. If it looks healthy, the next step is usually to maintain your current pattern and track the trend over time.
Trust note
Estimate only
This is a screening estimate only and is not a medical diagnosis. Measurements can shift the result, so trend tracking is usually more helpful than a single reading.
Common questions
It is a circumference-based screening formula that estimates body fat from visible body measurements.
It is useful for planning and trend tracking, but it is still an estimate rather than a lab test.
BMI, waist ratio, and lean body mass can help you interpret the result in a broader context.
Yes. It works best when you measure the same way each time and compare the trend over time.
No. The best target depends on your sex, age, and health context.
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