oz to gsm Converter

Enter either the fabric weight in ounces per square yard or grams per square meter into the calculator to determine the missing value. The fabric or material selection is optional and is used only to label the result.

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Oz to GSM Formula

The following formula is used to convert fabric weight from ounces per square yard to grams per square meter.

GSM = OZ \times 33.906

For the reverse conversion, use:

OZ = GSM / 33.906

Variables:

• GSM is the fabric weight in grams per square meter
• OZ is the fabric weight in ounces per square yard
• 33.906 is the standard conversion factor between oz/yd² and g/m²

To calculate gsm, multiply the ounces per square yard by 33.906. To convert back to oz/yd², divide the gsm value by 33.906.

What is Oz to GSM Conversion?

Oz to gsm conversion is used to compare fabric areal density between imperial and metric measurement systems. In the United States, fabric weight is often listed in ounces per square yard (oz/yd²), while many international textile specifications use grams per square meter (gsm or g/m²). Converting between the two helps when comparing supplier datasheets, material specifications, and textile standards.

Both oz/yd² and gsm measure weight per unit area. The conversion factor comes from the underlying unit relationships:

• 1 ounce ≈ 28.3495 grams
• 1 square yard = 0.836127 square meters

Combining these gives the standard textile conversion: 1 oz/yd² ≈ 33.906 gsm.

How to Convert Oz to GSM?

The following steps outline how to convert ounces per square yard to grams per square meter.

1. First, determine the fabric weight in ounces per square yard (oz/yd²).
2. Next, multiply that value by 33.906.
3. The result is the equivalent fabric weight in grams per square meter (gsm).
4. If you need to convert from gsm back to oz/yd², divide the gsm value by 33.906.
5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem: 

Use the following variables as an example problem to test your knowledge.

Fabric Weight (OZ) = 4 oz/yd²

GSM = 4 × 33.906 = 135.624 g/m²

Oz to GSM Conversion Table

The table below lists common oz/yd² to gsm conversions using the relationship GSM = OZ × 33.906. Values are rounded to two decimal places.

In practice, choosing between oz/yd² and gsm is mostly a matter of regional or industry convention. Knowing the conversion makes it easy to compare fabrics from different sources and ensure you are evaluating equivalent material weights.