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Fabric weight is measured in GSM (grams per square meter) internationally, but US textile specs commonly use ounces per square yard instead — the two units are related by a fixed conversion factor, not just a simple metric-prefix scaling, since both the mass and area units differ.
This calculator converts fabric weight between GSM, ounces per square yard, grams per square yard, and ounces per square meter.
How it works
Enter a value and select the unit you're converting from and to. The tool converts your value to GSM (the international standard) as an intermediate step, then to your target unit.
- Enter value.
- Enter from.
- Enter to.
- Click Calculate to see your results.
Examples
A medium-weight cotton fabric
A fabric rated at 150 GSM is about 4.42 ounces per square yard.
Who should use it
- Comparing fabric weight specs listed in different units between suppliers.
- Converting a fabric spec sheet from GSM to oz/yd² (or vice versa) for a sewing or manufacturing project.
Industry applications
- Textile and apparel manufacturing
- Sewing and craft projects
Advantages
- Covers both international (GSM) and US textile industry (oz/yd²) units.
- Simple, exact conversions.
Limitations
- Doesn't account for fabric-specific density or weave differences — this is a pure unit conversion.
Common mistakes to avoid
- Assuming GSM and ounces per square yard convert with a simple round number factor — the actual factor (about 33.9) comes from combining both a mass and an area unit conversion.
Best practices
- When comparing fabric specs from different suppliers, convert everything to the same unit (GSM is the most common international standard) before comparing weights directly.
Tips
- Fabric weight (GSM) is a good proxy for thickness and drape, but two fabrics with the same GSM can still feel very different depending on fiber type and weave.