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Sample grammage calculator

Cut, measure and weigh. Turn a sample of the complete finished material into grams per square metre.

01 / YOUR SAMPLES

Measure the actual cut size

Weigh all entered samples together. Tare the weighing container first. Count cut samples, not laminate layers. Do not enter one sample’s weight when the count is greater than one.

Example values only—not a product specification. Keep all laminate layers together; remove any external wrapping or weighing container.

02 / FINISHED-MATERIAL GRAMMAGE

Mass per square metre

120 g/m²

Estimated from your measured samples

Total sample area
0.03 m²
Average mass per sample
1.2 g
Use GSM for roll weight

Calculated precision is not measurement accuracy. This is arithmetic support, not a standardised laboratory acceptance test.

The formula

Total area (m²) = length (mm) × width (mm) × sample count ÷ 1,000,000
GSM = total net sample mass (g) ÷ total area (m²)

Example: three 100 × 100 mm samples cover 0.03 m². If they weigh 3.6 g together, grammage is 3.6 ÷ 0.03 = 120 g/m².

A 100 × 100 mm square covers 0.01 m²—not 0.1 m². A single sample’s mass in grams is therefore multiplied by 100 to obtain GSM.

Small samples amplify measuring errors

Measure the cut edges, not the intended cutter size. For example, a 1.2 g sample actually cut to 99 × 99 mm gives about 122.44 g/m², not 120.

Use an appropriate calibrated balance. Moisture, cut-size variation, uneven construction and scale resolution affect the result. Multiple samples can help represent a roll; this tool does not calculate a lab confidence interval.

Convert g/m² to oz/yd², or review the roll inspection guide.

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