> Title: GSM Calculator: Fabric Weight in g/m² and oz/yd² | Surajmal
> Source: https://surajmal.com/tools/gsm-calculator
> Publisher: Surajmal Shobhachand

[Tools](/tools)

# GSM calculator,  
_from a swatch, or g/m² to oz/yd²._

Weigh a cut swatch to get its GSM, or convert a weight between grams per square metre and ounces per square yard.

## GSM from a cut swatch

Swatch weight (g) 

Swatch area (cm²) 

A standard GSM cutter takes a 100 cm² disc.

180 g/m²

5.309 oz/yd²

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## Convert g/m² and oz/yd²

Weight 

Given in g/m² oz/yd²

5.309 oz/yd²

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## How GSM is measured

GSM is the weight of a fabric in grams per square metre. A 100 cm² GSM cutter cuts one hundredth of a square metre, so the weight of that sample in grams multiplied by 100 is the GSM.

A 100 cm² sample that weighs 1.8 g is a 180 g/m² fabric. With a sample of any other size, divide its weight by its area in square metres.

## g/m² and oz/yd²

One ounce per square yard is 33.906 g/m², the factor NIST publishes. To go from oz/yd² to g/m², multiply by 33.906; to go back, divide.

A 180 g/m² fabric is about 5.31 oz/yd², and a 5 oz/yd² fabric about 170 g/m².

## Weights by fabric

The weights buyers work to differ by fabric and garment. The [linen](/materials/linen) and [twill](/materials/twill) pages set them out on a weight scale, and [cotton](/materials/cotton) lists the weights of the house catalogue qualities.

## Common Questions

### How do I calculate the GSM of a fabric?

Cut a sample with a 100 cm² GSM cutter, weigh it in grams, and multiply by 100. A 1.8 g sample is 180 g/m².

### How do I convert GSM to oz?

Divide by 33.906. A 180 GSM fabric is about 5.31 oz/yd², and 150 GSM about 4.42 oz/yd².

### How do I convert oz to GSM?

Multiply by 33.906. A 5 oz/yd² fabric is about 170 g/m², and 8 oz/yd² about 271 g/m².

## Related

[Fabrics & yarns](/products/fabrics-and-yarns) [Linen](/materials/linen) [Twill](/materials/twill) [Cotton](/materials/cotton) [Yarn count converter](/tools/yarn-count-converter) [Glossary](/glossary)

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## Quoting a fabric at this weight?

Send the weight, the construction and the garment. We reply within 24 hours with swatches that match.

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