Paper Weight (GSM) Calculator
Convert paper weight between GSM, pounds and thickness to compare cardstock, printer paper and cover stock, free in your browser.
Enter Values
Minimum 0
Minimum 1
How to use this calculator
- Enter the paper's gsm and the sheet width and height in mm.
- Optionally set the number of sheets for the total.
How it works
Weight per sheet = gsm × area in m². A4 (210 × 297 mm) is about 0.0624 m², so 80 gsm ≈ 5 g.
Worked example
80 gsm A4. ≈ 5 g per sheet (about 2.5 kg per 500-sheet ream).
Common mistakes
- Mixing units — enter the sheet size in millimetres.
- Confusing gsm with 'pound' paper weights used in the US.
Frequently asked questions
What does GSM mean for paper?
Grams per square metre — the mass of one square metre of the paper. Higher GSM is generally thicker and stiffer.
What GSM is typical?
Office paper is around 80 GSM, flyers 100–150 GSM, and business cards 300–400 GSM. The feel changes noticeably across that range.
What does gsm mean?
Grams per square metre — the weight of one square metre of the paper, regardless of sheet size.
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Cite this tool
Zerdly. (2026). Paper Weight (GSM) Calculator. Retrieved from https://www.zerdly.com/tools/gsm-paper-weight-calculator/
Tip: Enter any known values to calculate the remaining results.
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