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Fabric GSM Calculator

Input the weight of your sample specimen in grams and its length and width in centimeters.

Measured on a calibrated precision electronic balance.

The Formula Explained

To compute GSM from a rectangular or square sample of arbitrary dimension:

Area (m²) = (Length cm × Width cm) / 10,000
GSM (g/m²) = Sample Weight (g) / Area (m²)

For standard circular GSM round cutters (100 cm²):
Since standard round cutters have an area of 0.01 m², simply multiply sample weight by 100:

GSM = Sample Weight (g) × 100

Worked Industrial Example

A fabric swatch of dimensions 20 cm × 25 cm weighs 9.0 grams:

  • Area = (20 × 25) / 10,000 = 0.05 m²
  • GSM = 9.0 / 0.05 = 180 g/m² (Standard Single Jersey)
Textile Testing Notice: Fabric specifications such as GSM, width, composition and performance may vary depending on yarn, construction, finishing process, manufacturer and end use. Values shown are general industry reference information and should not be treated as a supplier specification.