Health calculator
Body Fat Calculator
Estimate body fat percentage from tape measurements using a common formula.
Quick answer
How do you calculate body fat percentage?
The U.S. Navy method uses height plus waist and neck measurements (and hips for women) in a log formula. Typical healthy ranges are about 10–20% for men and 18–28% for women.
Men: 86.010 × log10(waist − neck) − 70.041 × log10(height) + 36.76 • Women add hip measurement
⚡ Answer updates as you type · Enter = calculate · Esc = reset
The Body Fat Calculator estimates body fat percentage from tape measurements using a common Navy-style formula.
About this Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy tape-measurement method. It needs only a few body measurements and gives a closer picture than BMI alone.
What you'll need
- • Sex
- • Height
- • Neck
- • Waist
- • Hip (women)
How it works
- 1. Measure your neck below the larynx.
- 2. Measure your waist at the navel for men, narrowest point for women.
- 3. Women also measure hips at the widest point.
- 4. Enter values to get an estimate.
Worked example
A man, 180 cm tall, 38 cm neck, 85 cm waist, has an estimated body fat near 18%.
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Body Fat Calculator FAQ
What is the Body Fat Calculator?
The Body Fat Calculator is a free online tool that helps you estimate body fat percentage from tape measurements using a common formula.
How do I use the Body Fat Calculator?
Open the Body Fat Calculator, enter the requested values, and review the instant estimate on the page.
Is the Body Fat Calculator free?
Yes. The Body Fat Calculator is free to use on Fast Online Calculator and does not require an account.
How accurate is the Navy method?
It is typically within 3–4% of more advanced methods like DEXA, which is good enough for everyday tracking.
What is a healthy body fat percentage?
Men: 10–20% is healthy, 6–13% for athletes. Women: 18–28% is healthy, 14–20% for athletes.
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