Understanding What Paper Quality Means

I know that I’ve been using “80 grams” paper, but I didn’t really understand why it was called “80 grams” until today.

What does gsm mean?

GSM is an abbreviation for grammage, or grams per square metre. It indicates the weight of a square metre of paper. Standard copy paper in Singapore is approximately 80 gsm, which means that a standard A4 sheet weighs 5 grams, and a 500 sheet ream weighs 2.5 kg.

Is gsm the same as thickness?

Not exactly. Thickness is measured in microns (millionths of a metre, or thousandths of
a millimetre). Standard copy paper typically has a thickness of about 100 microns, so
a 500 sheet ream is about 5cm thick. If two sheets have the same density, then their
thicknesses will be directly proportional to their grammage.

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The contents on this blog are not intended as professional advice. The author disclaims any liability, loss, or risk taken by individuals who directly or indirectly act on the information contained on this blog.