Body Fat Calculator
Estimate your body fat percentage using the US Navy method. Enter your measurements to get an estimate of your body composition.
What is Body Fat Percentage?
Body fat percentage is the proportion of your total body weight that is made up of fat tissue. Unlike BMI, which only considers height and weight, body fat percentage provides a more accurate measure of body composition by distinguishing between fat mass and lean mass (muscle, bone, organs).
This calculator uses the US Navy method, which estimates body fat percentage based on body measurements including neck, waist, and (for women) hip circumference. While this method provides a good estimate, it may not be as accurate as professional methods like DEXA scans or hydrostatic weighing.
Body Fat Percentage Ranges
For Men:
- Essential fat: 2-5%
- Athletes: 6-13%
- Fitness: 14-17%
- Average: 18-24%
- Obese: 25%+
For Women:
- Essential fat: 10-13%
- Athletes: 14-20%
- Fitness: 21-24%
- Average: 25-31%
- Obese: 32%+
How to Use the Body Fat Calculator
- Select gender: Choose male or female as the calculation method differs.
- Enter measurements: Input your age, weight, height, neck circumference, and waist circumference. Women also need to enter hip circumference.
- Measure accurately: Use a flexible measuring tape and measure at the narrowest point for neck and waist, and widest point for hips.
- Calculate: Click "Calculate Body Fat" to get your estimated body fat percentage.
- Interpret results: Compare your result to the ranges above, but remember this is an estimate.
Frequently Asked Questions
How accurate is this calculator?
The US Navy method provides a reasonable estimate but may have an error margin of 3-5%. For the most accurate measurement, consider professional methods like DEXA scans, bioelectrical impedance, or hydrostatic weighing.
When should I measure?
Measure in the morning before eating or drinking, and ensure the measuring tape is level and snug but not tight. Consistency in measurement conditions will give more reliable results over time.
What's a healthy body fat percentage?
Healthy ranges vary by age, gender, and activity level. Generally, 14-17% for men and 21-24% for women is considered fit, while 18-24% for men and 25-31% for women is average.
Should I consult a professional?
If you're concerned about your body composition or planning significant changes to your diet or exercise routine, consult with a healthcare provider or certified fitness professional for personalized guidance.
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