Health & Fitness
Body Fat 3-Site Skinfold Calculator
Estimate body fat from three Jackson-Pollock caliper sites and age.
Preparing your result…
What this calculator does
Calculates Body Fat 3-Site Skinfold Calculator using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Jackson–Pollock 3-site: men (chest + abdomen + thigh) D = 1.10938 − 0.0008267S + 0.0000016S² − 0.0002574 age; women (triceps + suprailiac + thigh) D = 1.0994921 − 0.0009929S + 0.0000023S² − 0.0001392 age; BF% = 495 ÷ D − 450
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Jackson–Pollock 3-site, S in mm and age in years: male D=1.10938−0.0008267S+0.0000016S²−0.0002574age (chest+abdomen+thigh); female D=1.0994921−0.0009929S+0.0000023S²−0.0001392age (triceps+suprailiac+thigh). BF%=495/D−450.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Original only displays male coefficients. Select sex-specific sites and equation; do not put female triceps into the male chest field without changing method. Original development populations were adults; avoid child extrapolation. Standardized caliper technique and mm units are essential.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Site 1: chest (men) / triceps (women) (mm) | Site 2: abdomen (men) / suprailiac (women) (mm) | Site 3: thigh (both) (mm) | Estimated body fat |
|---|---|---|---|---|
| Worked example | 15 | 25 | 20 | 18.5153 % |
| Half the amounts | 7.5 | 12.5 | 10 | 7.746 % |
| Double the amounts | 30 | 50 | 40 | 37.5896 % |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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