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GSM (grams per square metre) and oz/yd² (ounces per square yard) are the two standard ways to measure fabric weight. European manufacturers use GSM; American suppliers use oz/yd². The conversion factor is 1 GSM = 0.02949 oz/yd². This free converter handles the maths instantly and shows you where your fabric sits on the weight scale.
Fabric weight determines how a garment feels, drapes, and performs. A lightweight t-shirt is typically 140–180 GSM (4.1–5.3 oz/yd²). A standard hoodie runs 320–400 GSM (9.4–11.8 oz/yd²). A heavyweight hoodie — like White Cotton's signature 1100 GSM double-layered construction — is one of the heaviest available from any European manufacturer.
Convert between GSM and oz/yd² instantly. Find the ideal weight for every garment type and season.
Quick Reference
| GSM | oz/yd² | Category | Typical Use |
|---|---|---|---|
| 150 | 4.4 | Ultralight | Summer t-shirts |
| 200 | 5.9 | Lightweight | Premium t-shirts |
| 280 | 8.3 | Midweight | Light sweatshirts |
| 320 | 9.4 | Heavyweight | Standard hoodies |
| 400 | 11.8 | Heavyweight | Heavyweight hoodies |
| 480 | 14.2 | Heavyweight | Premium heavyweight |
| 550 | 16.2 | Heavyweight | Max single-layer |
Recommendations by Garment
Recommended ranges based on our production experience. The ideal weight also depends on design, finish, and target market.
FAQ
GSM stands for grams per square meter — it measures fabric weight (density). A 180 GSM t-shirt is lightweight and breathable, while a 480 GSM hoodie is thick and structured. Higher GSM generally means heavier, warmer, and more premium-feeling fabric.
We send free fabric swatches so you can feel the weight and quality before you decide.
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