Fabric Weight Converter
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Convert fabric weight between oz/yd² (US) and GSM (grams per square meter).
Fabric weight
GSM
186 GSM
5.5 oz/yd²
- oz/yd²
- 5.5
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Fabric weight units
Fabric weight describes how heavy a material is per unit area. Quilters and US retailers often list oz/yd² (ounces per square yard). International suppliers and technical specs use GSM (grams per square meter). Both measure the same property — area density.
Light quilting cotton is often 4–5 oz/yd² (135–170 GSM). Heavy canvas may exceed 12 oz/yd² (400+ GSM). Weight affects drape, warmth, and structure — compare like units when substituting fabrics.
Example: 5.5 oz/yd² × 33.906 ≈ 186 GSM. Conversely, 200 GSM ÷ 33.906 ≈ 5.9 oz/yd².
Common questions
What is a good GSM for quilting cotton?
Most quilting cotton falls between 130 and 200 GSM (roughly 4–6 oz/yd²). Heavier weights feel more substantial and wrinkle less.
Is GSM the same as thread count?
No. GSM is fabric weight per area. Thread count counts warp and weft threads per inch — a separate measure common in bed linens.