Fabric GSM Calculator

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GSM and oz/yd² from a cut sample's weight, and an estimate for woven fabric from EPI, PPI, counts and crimp

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What to work out

Sample weight

Sample area

Result

GSM

180g/m²

Ounces per square yard: 5.309 oz/yd²
Per square metre: 0.18 kg/m²

Working

GSM = weight (g) ÷ area (m²) = 1.8 ÷ 0.01 = 180

Formulas

GSM = sample weight (g) ÷ sample area (m²)
GSM (woven) ≈ [EPI × (1 + c₁) ÷ Ne_warp + PPI × (1 + c₂) ÷ Ne_weft] × 23.25
1 oz/yd² = 33.906 g/m²

c₁, c₂: warp and weft crimp (as a fraction)
23.25: the constant that turns inch, pound and Ne into g/m²

Assumptions

GSM is usually measured from a 100 cm² circular cut sample (weight × 100).
The woven formula takes yarn counts in Ne.

Sources: W. Klein, The Technology of Short-staple Spinning; J. E. Booth, Principles of Textile Testing · Weaving calculation texts as used in Bangladeshi and Indian mills

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