Ounces per Square Yard to GSM Quilt Batting Converter
Convert quilt batting weight between oz/yd² and grams per square metre, and estimate how much batting your whole quilt will weigh. 1 oz/yd² is 33.906 GSM.
Convert oz/yd² to GSM
Enter a batting weight, pick the direction, and get the converted value instantly. Add your quilt size to see the total weight of batting you will need.
Batting Weight Converter
Ounces per square yard to grams per square metre, and back.
Understanding Batting Weight
What oz/yd² and GSM actually tell you
oz/yd² to GSM
Multiply by 33.906. For example, 6 oz/yd² × 33.906 = 203.4 GSM. The factor comes from 28.3495 g per ounce divided by 0.836127 m² per square yard.
GSM to oz/yd²
Divide by 33.906. For example, 150 GSM ÷ 33.906 = 4.42 oz/yd². Use this to translate a UK or metric product page into US quilting terms.
Weight, Loft and Warmth
Weight measures how much fibre is in the batting, while loft is how thick it looks. Two battings with the same GSM can feel quite different depending on the fibre.
Total Weight
Total weight is GSM multiplied by the quilt’s area in square metres. It helps when estimating postage, or the finished weight of a bed quilt.
oz/yd² to GSM Batting Chart
Common batting weights converted both ways, with typical uses. Treat the uses as a guide, because products and fibres vary.
| oz/yd² | GSM (g/m²) | Weight Class | Typical Use |
|---|---|---|---|
| 2 | 67.8 | Very light | Table runners, wall hangings |
| 3 | 101.7 | Light | Summer quilts, baby quilts |
| 4 | 135.6 | Medium | All-round lap and bed quilts |
| 5 | 169.5 | Medium | Everyday bed quilts |
| 6 | 203.4 | Heavy | Cosy winter quilts |
| 8 | 271.3 | Heavy | Warm, puffy quilts and comforters |
| 10 | 339.1 | Extra heavy | Very thick comforters |
| 12 | 406.9 | Extra heavy | Specialist, high-loft projects |
Batting Weight FAQ
Answers to the most frequently asked questions about converting quilt batting weight from oz/yd² to GSM.
Multiply the weight in ounces per square yard (oz/yd²) by 33.906 to get grams per square metre (GSM). For example, 4 oz/yd² is about 135.6 GSM. To go the other way, divide GSM by 33.906.
1 ounce per square yard equals 33.906 grams per square metre. That is based on 1 ounce = 28.3495 grams and 1 square yard = 0.836127 square metres.
Many quilt battings fall between about 100 and 250 GSM, roughly 3 to 7 oz/yd². Lighter weights suit wall hangings and summer quilts, while heavier weights give a warmer, puffier finish. Always check the maker’s stated weight, as products vary.
Not always. Warmth depends on fibre type and loft as well as weight. Wool and polyester can be lighter in GSM than cotton yet trap more air, so use GSM as a guide rather than the only measure of warmth.
Yes. GSM stands for grams per square metre and is the same as g/m². It is the standard way of stating fabric and batting weight outside the US, where oz/yd² is more common.