Fabric GSM Calculator

Work out fabric gsm instantly with clear inputs, formula shown and shareable results.

About Fabric GSM Calculator

GSM is grams per square metre, calculated from a cut sample: sample weight x 10,000 / sample area in square centimetres. A standard 100 cm2 GSM cutter makes the arithmetic trivial. Weight per linear metre follows by multiplying GSM by fabric width in metres, which is what governs roll weight and freight.

Formulas

Fabric GSM

GSM = sample weight (g) x 10,000 / sample area (cm2)

Roll weight

Weight per linear metre = GSM x width (m); roll weight = per metre x length / 1000

Worked example

With the default values below, Fabric GSM Calculator returns Fabric GSM of 460.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Sample Weightminimum 0 g: 4.6 g
Sample Areaminimum 0 cm2: 100 cm2
Fabric Widthminimum 0.01 cm: 150 cm
Fabric Lengthminimum 0.01 m: 100 m

Results

Fabric GSM: 460.00
Weight Per Linear Metre: 690.00
Roll Weight: 69.000
Weight In Ounces Per Square Yard: 13.565

Step by step

1Values used
2Fabric GSM
3Roll weight
4Fabric GSM= 460.00
5Weight Per Linear Metre= 690.00
6Roll Weight= 69.000
7Weight In Ounces Per Square Yard= 13.565

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How many samples should be taken?

At least five from different positions across the width and along the length, then average. GSM commonly varies 3-5% across a knitted fabric width.

Should the fabric be conditioned first?

Yes. Cotton picks up 6-8% moisture, so weigh after conditioning at standard atmosphere (20 C, 65% RH) or GSM readings will not be comparable.