Verified Mathematical Model & Formulation
From Sample: GSM = (Sample Weight (g) / Sample Area (cm²)) × 10,000 From Woven: GSM ≈ [(EPI / Warp Count) + (PPI / Weft Count)] × 23.5 Oz/yd² = GSM / 33.906
Determines the aerial density of cloth. Standard swatch cutters cut a 100 cm² circular sample (diameter 11.28 cm), meaning sample weight in grams × 100 directly equals GSM.
Configurable Parameters & Standard Units
- Sample Weight (grams for 100 cm² disc): (Default: 1.8 count)
Standard Worked Example & Practical Verification
Scenario: A denim fabric swatch of 100 cm² weighs 4.25 grams on a digital scale.
Calculated Solution
425 GSM (12.5 oz Denim)
Practical Takeaway: Classified as medium-heavyweight bottom-weight denim.
Frequently Asked Questions
How do you convert GSM to oz/yd²?
Divide GSM by 33.906 (or multiply by 0.02949). For example, 170 GSM ÷ 33.906 = 5.01 oz/yd².