THE gsm CALCULATOR

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.

$10.00 AUD

Get the complete fabric toolkit and save.

Add the Shirring Calculator and the GSM Calculator to your cart together and receive both for a total of $15 AUD.

This bundle gives you two powerful tools:

  • The Shirring Calculator to plan fabric shrinkage and measurements with accuracy

  • The GSM Calculator to instantly work out fabric weights and compare textiles

Together they’ll help you sew smarter, waste less, and feel confident in every project.

WANT BOTH CALCULATORS?

Add The Shirring Calculator

  • The GSM Calculator is a digital tool that helps you measure the weight of fabric in grams per square metre (GSM). It works from a simple swatch so you can accurately understand your fabric before cutting into it or committing to a project.

    • When you purchase access you will receive:

      • The GSM Calculator on a private page of my website

      • A downloadable PDF plan with step by step instructions for cutting and weighing swatches

      • Quick conversion tips for both metric and imperial systems so you always have a reference in your studio

  • This tool is for sewists, patternmakers and fabric lovers who want to make more informed decisions about the textiles they use. Whether you are checking if a fabric is suitable for shirring, comparing options for a project, or learning about weight for the first time, the calculator is designed to support you.

  • Cut a 10 × 10 cm or 20 × 20 cm swatch of fabric, weigh it on a small digital scale, and enter the size and weight into the calculator. It will instantly generate the GSM and also show the equivalent in ounces per square yard. This helps you compare your fabric against standard fabric weights and make confident sewing choices.

  • After purchase you will receive a thank you email with a direct link and password to the private calculator page. You can log in at any time and use the calculator as often as you like. The downloadable PDF plan is also included so you can keep the method close by in your sewing space.

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