GSM to Thickness Calculator
Weight is not thickness.
Approximate thickness
330 µm
0.330 mm per sheet
GSM measures weight per square metre, not thickness, two papers at the same weight can differ substantially in thickness depending on bulk. The bulk factor varies from about 0.8 for coated stock to 1.5 or more for uncoated and textured papers, so treat this as an estimate.
How the GSM to Thickness Calculator works
GSM measures weight per square metre, not thickness. Two papers at the same weight can differ substantially in thickness depending on bulk, coated stocks are dense and thin, uncoated and textured ones are the opposite.
Also known as: paper weight to thickness · GSM paper calculator · card thickness from GSM
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Frequently asked questions
What does GSM mean?
Grams per square metre, the weight of one square metre of the paper. It is a weight measure that people use as a proxy for thickness.
How do I convert GSM to thickness?
Multiply by the bulk factor, which varies from around 0.8 for coated stock to 1.5 or more for uncoated and textured. Without knowing the bulk, the conversion is an estimate.
What GSM should I use?
80 to 120 for letterheads and flyers, 250 to 350 for business cards and postcards, 300 and above for premium cards and covers.
Why do two 300gsm cards feel different?
Different bulk. A textured uncoated 300gsm feels considerably thicker and more substantial than a coated 300gsm of the same weight.