US Navy Method
Uses height, neck, waist and hip measurements to estimate body fat percentage. It is simple for home use because it only requires a measuring tape.
Body Composition - Adults 18+
Free Body Fat Percentage Calculator - US Navy Method & Lean Mass Estimate
Estimate your body fat percentage using circumference measurements or a quick BMI-based estimate. View your body fat category, fat mass, lean body mass, target body fat and estimated fat-loss goal in one mobile-friendly WisePro Toolbox calculator.
Body Fat Calculator
Choose your method, enter details, and calculate instantly.
Estimated Body Fat
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Category
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Fat Mass--
Lean Body Mass--
Target Body Fat--
Estimated Fat To Lose--
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BMI-Based Estimate
Useful when circumference measurements are unavailable. It gives a quick body fat estimate using age, sex, height and weight.
Fat Mass & Lean Mass
The calculator also estimates fat mass and lean body mass so users can understand body composition beyond weight alone.
Body Fat Chart
Common Adult Body Fat Categories
Use this chart as a general body composition reference. Individual targets can vary by age, fitness level, health status and professional guidance.
| Category | Men | Women | Quick Meaning |
|---|---|---|---|
| Essential Fat | 2% - 5% | 10% - 13% | Minimum essential amount for basic body function. |
| Athletes | 6% - 13% | 14% - 20% | Common athletic and highly active range. |
| Fitness | 14% - 17% | 21% - 24% | Fit body composition range for many adults. |
| Average | 18% - 24% | 25% - 31% | Typical adult range seen in the general population. |
| Obese | 25%+ | 32%+ | Higher body fat range where health risk discussion may be useful. |
How to measure correctly
- Measure height standing straight without shoes.
- Measure neck just below the larynx.
- Measure waist around the navel for men and the narrowest practical waist point for women.
- For women, measure hip around the widest part of the hips or buttocks.
- Keep the tape flat, snug and not compressed into the skin.
Formula logic used
Men: body density formula uses waist minus neck and height.
Women: body density formula uses waist plus hip minus neck and height.
Fat mass: weight multiplied by body fat percentage.
Lean mass: total weight minus fat mass.
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Body Composition Guide
Body Fat vs BMI: Why Both Can Help
Body fat percentage focuses on body composition, while BMI is a height-to-weight screening value. These tools work best when interpreted together.
Body Fat Percentage
Helps estimate how much of your body weight is fat mass. It can be more useful for fitness tracking than scale weight alone.
BMI
Fast and easy screening value based on height and weight. It is helpful for population-level categories but does not directly measure fat.
Lean Body Mass
Useful for strength training, nutrition planning, protein goals and monitoring progress when weight stays stable but composition improves.
Smart interpretation tips
Track trendsMeasure consistentlyUse same tapeCompare every 2-4 weeksCombine with strength goals
A single estimate is less useful than a consistent trend. Measure at the same time of day and under similar conditions for better tracking.
Healthy progress guidance
- Use a moderate calorie deficit instead of extreme dieting.
- Combine resistance training, daily movement and adequate protein.
- Sleep, hydration and stress management can influence body composition progress.
- Consult a qualified healthcare professional for personal medical guidance.
Medical disclaimer: This calculator is for general educational use only. Body fat estimates can vary based on measurement accuracy and formula type. It is not intended to diagnose, treat, cure or prevent disease and should not replace professional medical advice.
FAQ
Body Fat Percentage Calculator FAQs
What is body fat percentage?
Body fat percentage is the estimated percentage of total body weight that comes from fat mass.
How accurate is the US Navy body fat method?
It is an estimate based on circumference measurements. Accuracy depends on measurement quality, body shape and consistency.
What measurements do men need?
Men usually need height, weight, neck and waist measurements.
What measurements do women need?
Women usually need height, weight, neck, waist and hip measurements.
Does body fat percentage replace BMI?
No. Body fat percentage and BMI provide different screening views. Body fat percentage offers more body composition context, while BMI is a quick height-to-weight screening value.
What is fat mass?
Fat mass is the estimated amount of your body weight that comes from fat tissue.
What is lean body mass?
Lean body mass is the estimated body weight that is not fat mass, including muscle, bone, organs and water.
Can I calculate using pounds and inches?
Yes. Select US units to enter measurements in inches and pounds.