If you mean: “I need the fabric weight, not the weight of the whole roll”
Fabric mass per unit area (GSM)
Also heard as GSM · grams per square metre · ounces per square yard
The mass of fabric divided by its area, commonly reported as grams per square metre or ounces per square yard.
- Why it matters
- It helps compare cloths with different widths, but it does not by itself predict drape, warmth, opacity, durability, or fiber content.
- Say or ask
- “What is the tested mass per unit area, in GSM, and which method and specimen did you use?”
- Boundary
- A small swatch may not represent an entire lot. Record the method, conditioning, specimen, and tolerance with the result.