Cover Factor Calculator
Cover factor measures how much of the fabric area the yarns hide: a 100 × 60 fabric in 30s × 30s yarn has a cloth cover factor of 21.41.
21.4098531416817
Full answer, then cut to fewer decimals (not rounded):
- 21.4098531416817
- 21.409853141681
- 21.40985314168
- 21.4098531416
- 21.409853141
- 21.40985314
- 21.4098531
- 21.409853
- 21.40985
- 21.4098
- 21.409
- 21.40
- 21.4
- Warp cover factor K₁ = n₁√tex₁/10
- 17.468
- Weft cover factor K₂
- 10.481
- Fractional cover Kc/28
- 76.46 %
- English warp cover EPI/√Ne
- 18.257
- English weft cover PPI/√Ne
- 10.954
Step-by-step solution
- K = threads per cm × √tex ÷ 10 (maximum 28, full cover)
- K₁ = 39.3701 × √19.6847 ÷ 10 = 17.468, K₂ = 10.481
- Kc = K₁ + K₂ − K₁K₂/28 = 21.41
Cover Factor Formula
Kc = K₁ + K₂ − K₁K₂/28
K = n√tex/10, n threads per cm; English K = EPI/√Ne; 28 is full cover
Worked Example
A 100 × 60 fabric in 30s × 30s yarn:
- K = threads per cm × √tex ÷ 10 (maximum 28, full cover)
- K₁ = 39.3701 × √19.6847 ÷ 10 = 17.468, K₂ = 10.481
- Kc = K₁ + K₂ − K₁K₂/28 = 21.41
Weft cover factor K₂: 10.481 · Fractional cover Kc/28: 76.46 % · English warp cover EPI/√Ne: 18.257 · English weft cover PPI/√Ne: 10.954
More Fabric Manufacture and Structure Calculators
-
Fabric GSM Calculator
GSM = [EPI(1 + c₁)tex₁ + PPI(1 + c₂)tex₂] × 39.37 ÷ 1000
c crimp, tex = 590.5/Ne
Example: A 100 × 60 fabric in 30s × 30s cotton with 8 % warp and 5 % weft crimp: Fabric weight = 132.523 g/m².
-
Crimp Calculator
c = (ly − lf) ÷ lf
Peirce: l = p(1 + c), h ≈ (4/3)p√c, θ ≈ 106√c degrees
Example: A yarn that measures 21.6 cm straightened from a 20 cm strip of fabric: Crimp = 8 %.
-
Knitted Fabric Calculator
cpc = kc/ℓ, wpc = kw/ℓ, S = cpc × wpc
ℓ loop length (cm); TF = √tex/ℓ (mm); GSM = S ℓ tex/10
Example: Plain jersey knitted from 30s yarn with a 3 mm loop length (dry relaxed): Fabric weight = 124.67 g/m².
Frequently asked questions
Why is 28 the maximum cover factor?
With K = n√tex/10, adjacent yarns of typical density just touch at K ≈ 28, giving complete cover.
Why subtract K₁K₂/28 in cloth cover?
Where warp and weft cross they cover the same area, so the overlap is removed to avoid counting it twice.
Sources
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Cover Factor Calculator. Retrieved October 25, 2026, from https://scientificconverters.com/calculators/cover-factor-calculator/
IEEE
Scientific Converters, "Cover Factor Calculator," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/calculators/cover-factor-calculator/