Carmedin
Free ToolLIVE
Skinfold Body Fat Calculator.
Estimate body fat percentage from caliper skinfold measurements using the Jackson-Pollock method (3-site or 7-site). For use with a physical skinfold caliper. For adults only — this is a screening estimate, not a diagnosis.
Processed locally
Jackson-Pollock protocols
ACE classification context
Enter skinfold measurements
Adults · physical caliper requiredMeasurementsJackson-Pollock 3-site / 7-site
Chest: diagonal fold halfway between the armpit crease and nipple. Abdomen: vertical fold 2cm to the right of the navel. Thigh: vertical fold on the front midpoint between hip and knee. All measurements on the right side of the body.
Processed locally in your browser. Values entered here are never transmitted to or stored by Carmedin.
ResultBody fat, mass & density
Body Fat Estimate
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% body fat (Jackson-Pollock 3-site)
Result context
Fat Mass—
Lean Mass—
Body Density—
Body Composition
How it's calculated: Body density is estimated from your skinfold sum using the Jackson & Pollock (1978/1980) generalized equations, then converted to body fat % using the Siri (1956) equation. Categories follow the American Council on Exercise (ACE) classification. Accuracy depends heavily on measurement technique — the published standard error is about ±3–4% body fat when measurements are taken correctly and consistently by a trained assessor. For adults only.
Reference
Classification and measurement technique.
The same ACE category context and measurement guidance from the current calculator are retained below.
American Council on Exercise (ACE) Classification
| Description | Women | Men |
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Measurement Tips
1Take each measurement 2–3 times and use the average.
2Pinch firmly enough to separate the fat layer from the muscle beneath.
3Hold the caliper perpendicular to the fold and read after about 2 seconds once the needle settles.
4Measure on the right side of the body regardless of handedness.
5Try to have the same person measure you the same way each time for consistent tracking.
Beyond a screening number
We help healthcare organizations build the systems behind population health data.
From clinical data pipelines to reporting dashboards, tools like this are one small piece of a much larger health informatics picture. That's what we do.