Fabric GSM Calculator
Convert fabric weight between GSM (g/m²) and oz/yd², and see what that weight means for your garment.
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Midweight — The everyday range — twills, denims, ponte, french terry, most bottom-weights.
Typical uses: pants, skirts, jackets, sweatshirts, structured dresses.
Fabric weight guide
| Weight range | Feel | Typical fabrics | Typical garments |
|---|---|---|---|
| Under 100 gsm (< 3 oz) | Sheer & floaty | chiffon, organza, voile, gauze | overlays, scarves, sheer blouses |
| 100–150 gsm (3–4.4 oz) | Light shirting | poplin, lawn, light jersey, rayon challis | shirts, dresses, linings |
| 150–250 gsm (4.4–7.4 oz) | Midweight | twill, chino, ponte, interlock, light denim | pants, skirts, light jackets |
| 250–350 gsm (7.4–10.3 oz) | Heavy mid | denim, french terry, canvas, suiting wool | jeans, hoodies, blazers |
| 350+ gsm (10.3+ oz) | Heavyweight | heavy denim, fleece, coating, duck canvas | coats, workwear, bags |
Every fabric on SWATCHON lists exact GSM, width and composition — filter 20,000+ wholesale fabrics by the weight you need.
GSM FAQ
How do I convert GSM to oz/yd²?
Divide GSM by 33.906. Example: 200 gsm ÷ 33.906 ≈ 5.9 oz/yd². To go the other way, multiply ounces by 33.906.
What GSM is good for t-shirts?
Most t-shirts use 140–200 gsm single jersey: lighter feels drapey and summery, heavier feels premium and structured.
What GSM counts as heavyweight fabric?
Roughly 300 gsm (about 9 oz/yd²) and up — heavy denim, fleece, canvas and coating weights.
Does GSM tell me how thick a fabric is?
Not exactly — GSM measures weight per area. A dense thin fabric and a lofty thick one can share the same GSM, so check thickness, drape and hand with a swatch before ordering.