Testing protocol · Body composition
Skinfolds: the 3-site protocol
Three skinfold sites, each the mean of one to three measurements.
Version 1 of the protocol in the StatsCenter catalogue.
Calculator
Body fat percentage calculator from skinfolds
Jackson and Pollock density
Density = a + b × Σ + c × Σ² + d × age, where Σ is the sum of the skinfolds in mm and age is in years.
| Sex | a | b | c | d |
|---|---|---|---|---|
| Men | 1.10938 | −0.0008267 | 0.0000016 | −0.0002574 |
| Women | 1.0994921 | −0.0009929 | 0.0000023 | −0.0001392 |
The formula
Body fat percentage (Siri) = 495 ÷ density − 450
Jackson & Pollock (1978); Jackson, Pollock & Ward (1980); Siri (1961). The equation estimates; it is not a clinical report and does not replace a direct measurement. It is the same calculation StatsCenter applies when a club collects.
Result
When collecting
What StatsCenter records and calculates.
Read from the product's protocol catalogue, in the version a club uses today when it creates an assessment.
Measures
- Chest skinfold
- mm · mean of each site's measurements
- Abdominal skinfold
- mm · mean of each site's measurements
- Thigh skinfold
- mm · mean of each site's measurements
- Triceps skinfold
- mm · mean of each site's measurements
- Suprailiac skinfold
- mm · mean of each site's measurements
Sites by sex
- Men
- Chest skinfold, Abdominal skinfold and Thigh skinfold
- Women
- Triceps skinfold, Suprailiac skinfold and Thigh skinfold
Collection conditions
None
Derived values
Estimated body density
g/cm³- Also uses
- sex on the athlete's record, age at collection
Jackson & Pollock, 3-site, sex-specific. Jackson & Pollock (1978); Jackson, Pollock & Ward (1980). Source
Estimated body fat percentage
%- Also uses
- sex on the athlete's record, age at collection
Jackson & Pollock, 3-site, with Siri. Jackson & Pollock (1978); Jackson, Pollock & Ward (1980); Siri (1961). Source
Other protocols
Who uses it at the club
Collect your squad's skinfolds in StatsCenter.
The protocol comes ready, with its attempts, its formulas and every athlete's history.
No card needed, every module included. Sign-up and the product are in Portuguese.