Kid's Body Composition Calculator
Estimate body fat in children and teens from triceps and calf skinfolds using the Slaughter equations.
Skinfold measurements
years
mm
mm
kg
Estimated body fat
--%
--
Sum of skinfolds--
Fat mass--
Lean mass--
Optimal range--
Body fat ranges for children and teens
| Category | Boys | Girls |
|---|---|---|
| Very low | < 6% | < 12% |
| Low | 6–10% | 12–15% |
| Optimal | 11–20% | 16–25% |
| Moderately high | 21–25% | 26–30% |
| High | 26–31% | 31–36% |
| Very high | 32%+ | 37%+ |
…
How the Slaughter equations work
Boys: %fat = 0.735 × (triceps + calf) + 1.0
Girls: %fat = 0.610 × (triceps + calf) + 5.1
Girls: %fat = 0.610 × (triceps + calf) + 5.1
…
Talking about the result
…
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This tool is for general information and fitness planning only and is not a medical diagnosis.
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