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Estimate your body fat percentage using multiple methods
The Body Fat Calculator can be used to estimate your total body fat based on specific measurements. Use the "Metric Units" tab if you are more comfortable with the International System of Units (SI). To get the best results, measure to the nearest 1/4 inch (0.5 cm). This calculation is based on the U.S. Navy method, but also includes the calculation of body fat percentage using the BMI method.
| Description | Women | Men |
|---|---|---|
| Essential fat | 10-13% | 2-5% |
| Athletes | 14-20% | 6-13% |
| Fitness | 21-24% | 14-17% |
| Average | 25-31% | 18-24% |
| Obese | 32+% | 25+% |
| Age | Women | Men |
|---|---|---|
| 20 | 17.7% | 8.5% |
| 25 | 18.4% | 10.5% |
| 30 | 19.3% | 12.7% |
| 35 | 21.5% | 13.7% |
| 40 | 22.2% | 15.3% |
| 45 | 22.9% | 16.4% |
| 50 | 25.2% | 18.9% |
| 55 | 26.3% | 20.9% |
The scientific term for body fat is "adipose tissue." Adipose tissue serves a number of important functions. Its primary purpose is to store lipids from which the body creates energy. In addition, it secretes a number of important hormones, and provides the body with some cushioning as well as insulation.
Body fat includes essential body fat and storage body fat. Essential body fat is a base level of fat that is found in most parts of the body. It is necessary fat that maintains life and reproductive functions. The amount of essential fat differs between men and women, and is typically around 2-5% in men, and 10-13% in women. The healthy range of body fat for men is typically defined as 8-19%, while the healthy range for women is 21-33%.
This calculator uses two different formulas to estimate body fat percentage:
The U.S. Navy method measures the circumference of specific body parts and uses formulas to estimate body fat. The measurements include the neck, waist, and hip for women, and neck and waist for men.
For men:Body Fat % = 86.010 × log10(abdomen - neck) - 70.041 × log10(height) + 36.76
For women:Body Fat % = 163.205 × log10(waist + hip - neck) - 97.684 × log10(height) - 78.387
The BMI method is less accurate but can be used when measurements are not available. It uses BMI and age to estimate body fat percentage.
For adult men:Body Fat % = 1.20 × BMI + 0.23 × Age - 16.2
For adult women:Body Fat % = 1.20 × BMI + 0.23 × Age - 5.4
Note: This calculator provides estimates only and should not be used for medical diagnosis. For more accurate measurements, consult with a healthcare professional for methods such as bioelectric impedance analysis, DEXA scans, or hydrostatic weighing.