Body fat calculator
Your body fat percentage from a few tape measurements, no scales or callipers needed.
- 100% free
- No sign-up
- Runs in your browser
How to use Body fat calculator
- Measure yourself
- Enter the numbers
- Read your result
Your measurements
Sex
Weight is optional; add it to see your fat and lean mass.
Your body fat
Enter your height and tape measurements to see your body fat.
ACE body fat ranges for women
| Essential fat | 10–13% |
|---|---|
| Athletes | 14–20% |
| Fitness | 21–24% |
| Average | 25–31% |
| Obese | 32%+ |
The US Navy tape method is usually within 3 to 4 percentage points of a DEXA scan. Measure the same way each time to track change.
Next: BMI calculator · BMR calculator · Calorie calculator
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How to use Body fat calculator
Measure yourself
With a soft tape, measure your neck and waist, and your hips if you’re a woman. Keep the tape snug but not tight.
Enter the numbers
Type your height and measurements in cm or inches. Add your weight to see fat and lean mass as well.
Read your result
See your body fat percentage, where it falls in the American Council on Exercise ranges, and your fat and lean mass.
Why use Utils365
Only a tape measure
The US Navy method needs just a few circumferences, so you can check it at home as often as you like.
Clear categories
Results are placed in the ACE ranges, from essential fat to athletes, fitness, average and obese.
Fat and lean mass
Add your weight to split it into fat and everything else, which is handy for tracking a diet or training plan.
Private
Worked out on your device. Your measurements aren’t sent or stored anywhere.
Frequently asked questions
How does the US Navy body fat method work?
It estimates body density from your height and the difference between your waist and neck (plus hips for women), then turns density into a body fat percentage. A man of 178 cm with a 50 cm neck and 96 cm waist gets about 15.7%.
How accurate is the tape measure method?
It’s usually within 3 to 4 percentage points of a DEXA scan for most people, which is similar to bathroom scales that measure body fat. Measuring the same way each time matters most.
What is a healthy body fat percentage?
The American Council on Exercise puts average at 18 to 24% for men and 25 to 31% for women. Fitness levels are 14 to 17% for men and 21 to 24% for women.
Where should I measure my waist?
Men measure around the navel; women at the narrowest part of the waist. Stand relaxed and measure after breathing out, without pulling the stomach in.
Why do women need a hip measurement?
Women tend to store more fat around the hips and thighs, so the women’s formula adds the hip measurement to give a fairer estimate.
What is essential fat?
The fat your body needs to work normally: about 2 to 5% in men and 10 to 13% in women. Going below it is unsafe.