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sci.woven-fabric-cover-factor Calculator
Calculates woven fabric cover factor from warp and weft parameters using Pierce's formula: cover factor = 1 − (1 − d_w/p_w)(1 − d_f/p_f). Maximum cover factor for circular yarns = 3/4 for each thread system — fabrics exceeding this jam and cannot be woven without yarn distortion.
Inputs
Warp Tex
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Weft Tex
Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Warp Ends Per Cm
Reference formula or conversion factor shown for context.
Weft Picks Per Cm
Reference formula or conversion factor shown for context.
Results
total cover factor K
A dimensionless multiplier applied in the calculation.
warp cover factor Kw
A dimensionless multiplier applied in the calculation.
weft cover factor Kf
A dimensionless multiplier applied in the calculation.
fabric coverage (%)
The fraction of the total that is protected, tested, or accounted for. Higher coverage reduces risk of gaps.
K = Kw + Kf - Kw·Kf (Peirce)
Reference formula or conversion factor shown for context.
K=1 means 100% cover — fully opaque fabric
Arithmetic average — sum divided by count. Simple and familiar, but pulled by outliers. If your data contains extreme values, the median may be more representative.