Fabric GSM Calculator

Work out the GSM of a fabric or towel sample from its weight and dimensions. Weigh a cut sample, enter its size, and get GSM and ounces per square yard.

How This Calculation Works

GSM = sample weight (g) ÷ sample area (m²)

Ounces per square yard = GSM ÷ 33.906

Worked Example

A 10 × 10 cm sample weighing 5 g has an area of 0.01 m², so its GSM is 5 ÷ 0.01 = 500.

Note: Use an accurate scale and a cleanly cut sample. Very small samples can magnify measuring errors.

Frequently Asked Questions

Any size works mathematically, but larger, accurately cut samples reduce measuring error.

Moisture affects weight, so weigh samples under consistent conditions when comparing results.

The calculator shows ounces per square yard, and you can also use the GSM to Ounce Calculator.

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