Take the guesswork out of fabric weights.
The GSM Calculator helps you quickly work out the grams per square metre (GSM) of any fabric using just a small swatch. Whether you are planning a new sewing project, comparing textiles, or checking the suitability of a fabric for shirring, draping, or patternmaking, this tool gives you accurate and instant results.
Simply weigh a 10 × 10 cm or 20 × 20 cm fabric swatch, enter your measurement, and the calculator will generate the GSM for you along with the equivalent in ounces per square yard for reference. This is perfect for makers who want to understand their fabric choices more deeply and sew with confidence.
Every purchase comes with access to the calculator and a downloadable PDF plan, including clear instructions for cutting and weighing swatches as well as quick conversion tips to keep on hand in your studio.
Take the guesswork out of fabric weights.
The GSM Calculator helps you quickly work out the grams per square metre (GSM) of any fabric using just a small swatch. Whether you are planning a new sewing project, comparing textiles, or checking the suitability of a fabric for shirring, draping, or patternmaking, this tool gives you accurate and instant results.
Simply weigh a 10 × 10 cm or 20 × 20 cm fabric swatch, enter your measurement, and the calculator will generate the GSM for you along with the equivalent in ounces per square yard for reference. This is perfect for makers who want to understand their fabric choices more deeply and sew with confidence.
Every purchase comes with access to the calculator and a downloadable PDF plan, including clear instructions for cutting and weighing swatches as well as quick conversion tips to keep on hand in your studio.
