Are you trying to determine the weight of a fabric in ounces but only have the GSM? Whether you are a textile importer, a fashion designer, or a sewing enthusiast, understanding how Grams per Square Meter (GSM) translates to Ounces per Square Yard (oz/yd²) is crucial for material selection.
Our GSM to OZ Calculator provides an instant conversion using the high-precision textile standard of 33.9057.
GSM to OZ Converter
What is GSM?
GSM stands for Grams per Square Meter. It is the standard metric unit used globally to measure the density and weight of fabrics, paper, and other sheet materials. A higher GSM generally indicates a thicker, heavier, or more durable material.
Understanding the Conversion: GSM to Ounces
While most of the world uses GSM, the United States textile market typically uses Ounces per Square Yard (oz/yd²). To compare materials accurately, you need to bridge the gap between metric and imperial units.
The Conversion Formula
To convert GSM to OZ manually, you divide the GSM value by the constant 33.9057.
GSM to OZ Reference Table
This table helps you quickly identify common fabric weights used in the industry:
| Fabric Weight (GSM) | Imperial Weight (oz/yd²) | Typical Fabric Type |
| 150 GSM | 4.42 oz | Lightweight Jersey / Underwear |
| 180 GSM | 5.31 oz | Standard Retail T-shirt |
| 210 GSM | 6.19 oz | Heavyweight T-shirt |
| 280 GSM | 8.26 oz | Sweatshirt / French Terry |
| 340 GSM | 10.03 oz | Heavy Hoodie / Canvas |
| 400 GSM | 11.80 oz | Denim / Outerwear |
Why Use Our Calculator?
- Accuracy: We use the precise 33.9057 factor rather than rounding to 34, ensuring your specs are factory-ready.
- Dual-Function: While optimized for GSM to OZ, you can easily toggle to convert in the opposite direction.
- Free Tool: No registration required—just instant results for your production or design workflow.
Related: OZ to GSM Calculator
Frequently Asked Questions
1. How many OZ is 200 GSM?
200 GSM is approximately 5.90 oz/yd². This is a common weight for high-quality, mid-weight T-shirts.
2. Is 300 GSM heavy for a hoodie?
Yes, 300 GSM (approx. 8.85 oz) is considered a standard “medium-to-heavy” weight for fleece hoodies, providing good warmth and structure.
3. How do you convert GSM to Ounces per Square Yard?
Simply divide the GSM by 33.9057. For a quick estimate, some use 33.9, but our calculator uses the full constant for better precision.
Also see: Unit Converters