Weaving & Fabric Construction

Shirley Fabric Cover Factor Calculator

Cover factor predicts handle, air permeability and printability better than GSM alone.

Warp Ends
EPI
Ne
Weft Picks
PPI
Ne

Total Cover Factor

— K

Peirce total cover; 28 is theoretical full cover

Cover Breakdown

Warp Cover Factor
— K1
Weft Cover Factor
— K2
Fabric Surface Covered
— %
Open Area
— %

Cover Contribution

—% warp —% weft

Peirce assumes circular yarn cross-sections. Real yarns flatten under beat-up, so dense fabrics measure a higher effective cover than the formula predicts.

Shirley Fabric Cover Factor Calculator — free, with the formula and a worked example, at Textile School.