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Body Fat Percentage Calculator - Body Composition

Free body fat percentage calculator using US Navy method. Calculate your body fat from waist, neck, and hip measurements to understand your body composition.

Body Fat Percentage Calculator

Calculate your body fat percentage using body measurements

Biological sex affects body fat distribution and calculation formula.

yas

Age is used to determine ideal body fat range.

kg

Your body weight is used to calculate fat mass and lean mass.

cm

Height is an important parameter in the US Navy formula.

cm

Measure just below the Adam's apple, horizontally with tape. Don't squeeze too tight.

cm

Men: Measure at navel level. Women: Measure at narrowest point (usually above navel).

cm

Required for women only. Measure at widest point of hips horizontally.

US Navy method uses body measurements and is most commonly used.

Your Results

Enter your values to see results

and click the "Calculate" button

What is Body Fat Percentage?

Body fat percentage is a critical health indicator showing what percentage of your total body weight is fat tissue. Unlike BMI, body fat percentage reflects actual body composition and allows more accurate assessment of health risks. Essential fat protects organs and plays a role in hormone production, while excess stored fat can lead to health problems.

How to Use This Calculator

  1. Select your gender
  2. Enter age, weight, and height
  3. Measure and enter neck and waist circumference
  4. For women, also enter hip circumference
  5. Click Calculate to see your body fat percentage

US Navy Formula

Men: 86.010×log10(waist-neck) - 70.041×log10(height) + 36.76

Women: 163.205×log10(waist+hip-neck) - 97.684×log10(height) - 78.387

Frequently Asked Questions

What's the difference between body fat percentage and BMI?
BMI only considers height and weight, while body fat percentage measures actual fat. A bodybuilder and obese person can have same BMI but very different body fat. Body fat percentage reflects health status more accurately.
What is the ideal body fat percentage?
For men 14-18%, for women 21-25% is considered 'fit' category. However, ideal varies by age, activity level, and personal goals. Athletes may have lower percentages, while this range is sufficient for healthy living.
How accurate is the US Navy method?
US Navy method provides results with approximately ±3-4% margin of error. While less accurate than DEXA scans, it can be done free at home and is excellent for tracking changes. Consistent measurement technique improves accuracy.
Why do women have higher fat percentages than men?
Women need more fat for reproductive health, hormonal balance, and pregnancy. Estrogen promotes fat storage. Breast tissue and hip area tend to accumulate fat. This is biological necessity and normal for health.
Is very low body fat harmful?
Yes, going below essential fat causes serious health problems. Hormonal imbalance, reproductive issues, weakened immunity, bone density loss, and fatigue occur. Women may experience irregular or absent periods.

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