Fabric Weight Converter
Convert GSM, oz/yd² and momme.
Fabric weight predicts drape and use: quilting cotton ~120 GSM, denim 200–400, canvas 300+.
How to use
- Enter a fabric weight in any unit.
- Conversions update live as you type.
- The "feel" hint tells you what the weight means.
About this tool
GSM (grams per square meter) is the global standard; US sellers often use oz/yd²; silk uses momme.
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How it works
GSM — grams per square metre — is the worldwide standard for fabric weight, and the number tells you how a fabric behaves: around 100 GSM is light shirting, 200+ is denim territory, 400+ is heavy canvas. Higher GSM means heavier, usually thicker and more durable, but also stiffer.
The US customary unit is ounces per square yard (oz/yd²): 1 oz/yd² = 33.906 GSM. That 12 oz denim on quality jeans labels converts to about 407 GSM — firmly heavyweight.
Silk has its own unit, the momme (厁, pronounced ‘mom-mee’): 1 momme = 4.340 GSM. A 19-momme pillowcase (≈ 82 GSM) is the common quality pick; 22 momme and up is premium bedding weight. Momme measures weight, not thread count — the two are often confused.
Worked examples
How heavy are those jeans?: Label says 12 oz/yd². Multiply by 33.906 → about 407 GSM. That is heavyweight denim: stiff at first, breaks in beautifully.
Silk pillowcase shopping: A 16-momme listing = 16 × 4.34 ≈ 69 GSM — light blouse weight, fine but delicate. For bedding that lasts, look for 22+ momme (≈ 95+ GSM).
Quick reference
| GSM range | Typical fabrics |
|---|---|
| Under 100 | Voile, chiffon, lining |
| 100–150 | Shirting, quilting cotton |
| 150–250 | Twill, poplin, light denim |
| 250–350 | Denim, canvas (light) |
| 350+ | Heavy canvas, upholstery |
| Conversion | Factor |
|---|---|
| oz/yd² → GSM | × 33.906 |
| momme → GSM | × 4.340 |
Frequently asked questions
What GSM is t-shirt fabric?
Light jersey is typically 120–180 GSM.
What is momme?
The traditional silk weight unit — 1 momme ≈ 4.34 GSM. Heavier momme = more durable silk.
Is my input stored?
No.
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