Body Fat Calculator
Calculate your body fat percentage using the US Navy method or BMI-based estimation. Check your fat mass, lean mass, and body fat category.
Measure waist, neck, and hip (women) circumference for accurate body fat calculation
Measure at navel level
Measure at the narrowest point
📖 How to Use
- Select the calculation method (Precise or Simple)
- Select your gender
- Enter your height (cm) and weight (kg)
- Precise method: Enter waist, neck, and hip (women) circumference
- Simple method: Enter your age
- Click Calculate to see your body fat percentage and body composition
✨ Features
- ✓Accurate body fat calculation using US Navy formula
- ✓BMI-based body fat estimation for quick results
- ✓Fat mass and lean mass (muscle, bone, etc.) calculation
- ✓Gender/age-specific body fat ranges
- ✓5-level body fat classification (Essential/Athlete/Fitness/Average/Obese)
- ✓Visual chart to see your current position
📐 Formula
Male: 495/(1.0324-0.19077×log(waist-neck)+0.15456×log(height))-450
Female: 495/(1.29579-0.35004×log(waist+hip-neck)+0.22100×log(height))-450💡 How It Works
- •Body fat percentage is the proportion of fat in your total body weight.
- •The US Navy formula was developed in 1984 using body circumference measurements.
- •Men need waist and neck measurements; women need waist, neck, and hip measurements.
- •The BMI-based estimation (Deurenberg formula) is: BF% = 1.20×BMI + 0.23×age - 10.8×sex - 5.4
- •Essential fat (men 2-5%, women 10-13%) is the minimum fat needed for survival.
- •Athlete range (men 6-13%, women 14-20%) is typical for elite athletes.
- •Too little body fat can be unhealthy, leading to hormonal imbalances and other issues.
❓ FAQ
Q. What is body fat percentage?
A. The percentage of your total body weight that is fat. For example, at 70kg with 20% body fat, you have 14kg of fat.
Q. How accurate is the US Navy formula?
A. Studies show it's within 3-4% of DEXA scans. With careful tape measurement, you can get reliable results.
Q. Where do I measure my waist?
A. Men measure at navel level; women at the narrowest point (between ribs and hips). Measure while exhaling.
Q. Where do I measure my neck?
A. At the narrowest point, usually just below the Adam's apple.
Q. What's the difference between body fat % and BMI?
A. BMI uses only height and weight, not distinguishing muscle from fat. Body fat percentage measures actual fat, making it a more accurate health indicator.
Q. What is the ideal body fat percentage?
A. Healthy body fat is 14-24% for men, 21-31% for women. For fitness goals, aim for 14-17% (men) or 21-24% (women).