Free tools/Yarn & Fabric
GSM to oz/yd2 Converter
Convert GSM to oz/yd2 and back, with a fabric weight chart from 100 to 600 GSM and 3 to 18 oz, the formula (1 oz/yd2 = 33.906 GSM) and typical weights for T-shirts, fleece and denim.
GSM
180g/m2
Weight
5.31oz/yd2
The formula
1 oz/yd2 = 33.906 g/m2.
Worked example
Weight value: 180, From: g/m2 (GSM). Result: GSM = 180 g/m2; Weight = 5.31 oz/yd2.
What weight is this fabric?
GSM is grams per square metre; oz/yd2 is ounces per square yard. Divide GSM by 33.906 to get oz/yd2, or multiply oz/yd2 by 33.906 to get GSM. 200 GSM is 5.90 oz/yd2, and 6 oz/yd2 is 203.4 GSM.
Lightweight: 100 to 150 GSM (about 3 to 4.4 oz), voiles, shirting and summer T-shirt jersey. Midweight: 150 to 250 GSM (4.4 to 7.4 oz), most T-shirts (160 to 200), polo pique (200 to 240) and kids rib. Heavyweight: above 250 GSM (7.4 oz and up), French terry (260 to 300), fleece and sweatshirts (280 to 350), and denim (10 to 14 oz, about 340 to 475 GSM).
Denim is usually quoted in oz/yd2 and knits in GSM. A 12 oz denim is about 407 GSM. Woven weights are often stated before washing; garment-washed denim can lose 3 to 8 percent of its weight.
GSM to oz/yd2 chart
| GSM (g/m2) | oz/yd2 |
|---|---|
| 100 | 2.95 |
| 110 | 3.24 |
| 120 | 3.54 |
| 130 | 3.83 |
| 140 | 4.13 |
| 150 | 4.42 |
| 160 | 4.72 |
| 170 | 5.01 |
| 180 | 5.31 |
| 190 | 5.60 |
| 200 | 5.90 |
| 210 | 6.19 |
| 220 | 6.49 |
| 230 | 6.78 |
| 240 | 7.08 |
| 250 | 7.37 |
| 260 | 7.67 |
| 270 | 7.96 |
| 280 | 8.26 |
| 290 | 8.55 |
| 300 | 8.85 |
| 310 | 9.14 |
| 320 | 9.44 |
| 330 | 9.73 |
| 340 | 10.03 |
| 350 | 10.32 |
| 360 | 10.62 |
| 370 | 10.91 |
| 380 | 11.21 |
| 390 | 11.50 |
| 400 | 11.80 |
| 410 | 12.09 |
| 420 | 12.39 |
| 430 | 12.68 |
| 440 | 12.98 |
| 450 | 13.27 |
| 460 | 13.57 |
| 470 | 13.86 |
| 480 | 14.16 |
| 490 | 14.45 |
| 500 | 14.75 |
| 510 | 15.04 |
| 520 | 15.34 |
| 530 | 15.63 |
| 540 | 15.93 |
| 550 | 16.22 |
| 560 | 16.52 |
| 570 | 16.81 |
| 580 | 17.11 |
| 590 | 17.40 |
| 600 | 17.70 |
Fabric weight in grams per square metre and the same weight in ounces per square yard (divide by 33.906).
oz/yd2 to GSM chart
| oz/yd2 | GSM (g/m2) |
|---|---|
| 3.0 | 101.7 |
| 3.5 | 118.7 |
| 4.0 | 135.6 |
| 4.5 | 152.6 |
| 5.0 | 169.5 |
| 5.5 | 186.5 |
| 6.0 | 203.4 |
| 6.5 | 220.4 |
| 7.0 | 237.3 |
| 7.5 | 254.3 |
| 8.0 | 271.2 |
| 8.5 | 288.2 |
| 9.0 | 305.2 |
| 9.5 | 322.1 |
| 10.0 | 339.1 |
| 10.5 | 356.0 |
| 11.0 | 373.0 |
| 11.5 | 389.9 |
| 12.0 | 406.9 |
| 12.5 | 423.8 |
| 13.0 | 440.8 |
| 13.5 | 457.7 |
| 14.0 | 474.7 |
| 14.5 | 491.6 |
| 15.0 | 508.6 |
| 15.5 | 525.5 |
| 16.0 | 542.5 |
| 16.5 | 559.4 |
| 17.0 | 576.4 |
| 17.5 | 593.4 |
| 18.0 | 610.3 |
Fabric weight in ounces per square yard and the same weight in grams per square metre (multiply by 33.906).
Assumptions
- Standard conversion factor 33.906.
Questions
- How do I convert GSM to oz?
- Divide GSM by 33.906. For example 180 GSM / 33.906 = 5.31 oz/yd2.
- How many GSM is 6 oz?
- 6 oz/yd2 x 33.906 = 203.4 GSM.
- What is 200 GSM in oz?
- 200 GSM is 5.90 oz/yd2, a mid-weight T-shirt or light sweatshirt fabric.
- What GSM is 12 oz denim?
- 12 oz/yd2 x 33.906 = 406.9 GSM.
Read the guide
In the platform
Intelactory records which yarn lot went into which fabric roll, dye batch and carton as the work happens, so a count or GSM question traces back to its source.