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sci.fabric-cover-factor-Peirce Calculator
Calculates Peirce cover factor for woven fabric from thread spacing and yarn diameter: K = 1 − (1 − d/p_warp)(1 − d_w/p_weft). Maximum theoretical cover factor = 1.0 — fabrics with K < 0.8 are open-structured; K > 0.95 approaches the geometric limit for circular cross-section yarns.
Inputs
D Warp Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
D Weft Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
P Warp Mm
Reference formula or conversion factor shown for context.
P Weft Mm
Reference formula or conversion factor shown for context.
Results
fabric cover factor K (0–1)
A dimensionless multiplier applied in the calculation.
warp cover factor K1
A dimensionless multiplier applied in the calculation.
weft cover factor K2
A dimensionless multiplier applied in the calculation.
ends/cm
Sample size or count used in the calculation.
K = K1 + K2 − K1·K2
Reference formula or conversion factor shown for context.
fabric class
The classification assigned based on the computed value.