Conversion calculator
Convert fabric weight from ounces per square yard to grams per square meter, including common denim weights, using the exact conversion factor.
Fabric weight
406.9g/m²
| oz/yd² | GSM (g/m²) |
|---|---|
| 3 | 101.7 |
| 4 | 135.6 |
| 5 | 169.5 |
| 6 | 203.4 |
| 7 | 237.3 |
| 8 | 271.2 |
| 9 | 305.2 |
| 10 | 339.1 |
| 11 | 373 |
| 12 | 406.9 |
| 13 | 440.8 |
| 14 | 474.7 |
| 16 | 542.5 |
GSM = oz/yd² × 33.906
| Symbol | Meaning | Unit |
|---|---|---|
| oz/yd² | Fabric weight in ounces per square yard | oz/yd² |
| 33.906 | Conversion factor | (g/m²)/(oz/yd²) |
The converter multiplies ounces per square yard by 33.906. One ounce is 28.3495 grams and one square yard is 0.836127 square meters, and their ratio is the factor.
A jeans program specifies 13.5 oz rigid denim. In GSM:
13.5 × 33.906 = 457.7 g/m²
Denim is usually described by its rigid weight. As a rough guide, lightweight denims for shirts and summer styles sit at the lower end of the range, most jeans fall in the middle, and heavy workwear and raw selvedge denims sit at the top. Converting the whole range with this tool gives about 170 GSM at 5 oz, 340 GSM at 10 oz and 475 GSM at 14 oz.
12 oz/yd² multiplied by 33.906 is 406.9 GSM. Remember that denim weight is usually quoted before washing.
Garment washing removes size and some fiber, and changes dimensions. Compare the specification with a test on the same fabric state.
How to convert fabric weight between grams per square meter and ounces per square yard, where the 33.906 factor comes from, and why linear weight is a different number.
GSM is the weight of one square meter of fabric in grams. Learn how to measure it with a round cutter, calculate it from any sample size, estimate it from construction, and control it in production.