Body Fat Percentage Calculator
Calculate your body fat using the U.S. Navy method
• Neck: Measure below the larynx with tape sloping downward
• Waist: At navel for men, smallest width for women
• Hips (women only): At the largest horizontal measure
What is the Body Fat Percentage Calculator? How Does It Work? Ultimate Guide
This calculator helps you estimate your body fat percentage using the U.S. Navy Method. It only requires a few simple measurements: your height, neck, waist, and for women, hip size. The results give you a clear idea of how much of your body is fat and how much is lean mass. This method is trusted by health professionals and the military. It’s a quick and easy way to track changes in your body over time.
Formulas Used
This tool uses formulas developed by Hodgdon and Beckett in 1984. These are:
For Men (Imperial units):
Body Fat % = 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76
For Women (Imperial units):
Body Fat % = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387
For Men (Metric units):
Body Fat % = 495 / (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450
For Women (Metric units):
Body Fat % = 495 / (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.22100 × log10(height)) − 450
These equations use logarithms to provide accurate results based on your body shape.
Body Fat Categories
Here’s what your body fat percentage means:
| Category | Men (%) | Women (%) |
|---|---|---|
| Essential Fat | 2–5 | 10–13 |
| Athletes | 6–13 | 14–20 |
| Fitness | 14–17 | 21–24 |
| Average | 18–24 | 25–31 |
| Obese | 25+ | 32+ |
These ranges help you understand where you stand health-wise. Everyone’s body is different, and that’s okay.
Accuracy Notes
- This calculator gives an estimate.
- The expected accuracy is within ±3–4%.
- It’s not as exact as lab methods, but it’s great for everyday use.
- Make sure to measure correctly for best results.
- For medical or athletic needs, speak with a health expert.
Fat Mass and Lean Mass Explained
Once your body fat percentage is known, we also calculate
- Fat Mass (FM) = Body Fat % × Total Weight
- Lean Mass (LM) = Total Weight − Fat Mass
This shows how much of your body weight is fat and how much is everything else—like muscles, bones, and organs.
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This body fat percentage calculator is completely free to use.
No hidden fees. No logins. Just accurate results in seconds.
✔ Track your progress anytime
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✔ Use it as part of your fitness routine
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