What is the skinfold assessment technique and how does it work?

Overview

Skinfold assessment is a widely used, cost-effective method for estimating body composition. It involves pinching the skin at specific body sites with calipers to measure the thickness of the underlying fat layer. These measurements are then used to calculate body fat percentage.

How It Works

A trained assessor uses skinfold calipers to pinch the skin at defined measurement sites on the body.
The goal is to isolate adipose tissue (fat) from the underlying muscle.
The caliper measures the thickness of the folded, pinched skin, which is assumed to represent fat tissue.
Measurements are fed into equations that first estimate body density, which is then used to derive body fat percentage.

Key Factors in the Calculations

Multiple equations exist for estimating body fat from skinfold data — the choice of equation affects results.
Age is a variable in the equations.
Separate equations are used for each sex.

Notes

Skinfold assessment is considered reliable, but accuracy depends heavily on proper training and technique.
Results may be less valid for individuals who are overweight, obese, or very lean.
Different caliper brands or models may produce different readings, even at the same site.
The method relies on several assumptions that may not hold true for all individuals:
- Constant density of muscle and fat
- Constant skin thickness
- Constant ratio of subcutaneous to internal fat
- Constant adipose tissue fat proportion
- Constant compressibility and distribution of fat throughout the body

Despite these limitations, skinfold assessment remains a common and affordable tool for body composition evaluation.

If this resolves your issue, no further action is needed.

If the problem persists, contact support and include: the assessment method in use, software version, and a description of any calculation discrepancies observed.

Applies to: All Styku configurations used alongside manual skinfold assessment workflows