Skinfold Body Fat Calculator (Durnin & Womersley)
Body Fat Categories
| Category | Men (%) | Women (%) |
|---|---|---|
| Essential | 2–5% | 10–13% |
| Athletic | 6–13% | 14–20% |
| Fitness | 14–17% | 21–24% |
| Average | 18–24% | 25–31% |
| High | 25%+ | 32%+ |
How This Calculator Works
This calculator estimates your body fat percentage using the Durnin & Womersley Method, a widely used skinfold (calipers) technique that measures subcutaneous fat at multiple body sites. It is known for its strong reliability across different age groups.
Step 1: Take Skinfold Measurements
- Men & Women: Biceps, Triceps, Subscapular, Suprailiac
Measurements are taken using calipers in millimeters (mm). Each site should be measured 2–3 times and averaged for better accuracy.
Step 2: Calculate Body Density
Density = A − (B × log₁₀(Σ4))
(Σ4 = sum of the four skinfold measurements)
Constants (A & B)
| Age | Men (A) | Men (B) | Women (A) | Women (B) |
|---|---|---|---|---|
| 17–19 | 1.1620 | 0.0630 | 1.1549 | 0.0678 |
| 20–29 | 1.1631 | 0.0632 | 1.1599 | 0.0717 |
| 30–39 | 1.1422 | 0.0544 | 1.1423 | 0.0632 |
| 40–49 | 1.1620 | 0.0700 | 1.1333 | 0.0612 |
| 50+ | 1.1715 | 0.0779 | 1.1339 | 0.0645 |
Step 3: Convert to Body Fat %
This final step uses the Siri equation to convert body density into body fat percentage.
Disclaimer:
This Durnin & Womersley body fat calculator provides an estimate based on skinfold measurements taken with calipers. Results may vary depending on measurement technique, caliper quality, and individual differences in fat distribution. This method estimates subcutaneous fat and may not fully reflect total body fat. It is intended for general informational purposes only and should not be considered medical, fitness, or nutritional advice.