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GSM Paper Weight Calculator
Use the GSM paper weight calculator to estimate sheet and ream weight. Enter paper dimensions, GSM and quantity for results in grams and kilograms.
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Estimate the mass of a paper order
Enter the actual sheet width and height in millimetres, the paper’s stated GSM and the number of sheets. Use parent-sheet dimensions for untrimmed stock or finished dimensions for trimmed pieces. Select Calculate to see one-sheet mass and the total paper mass.
The GSM calculation
GSM means grams per square metre. Sheet mass in grams = width in mm × height in mm ÷ 1,000,000 × GSM. Total kilograms = sheet grams × quantity ÷ 1,000. An A4 sheet at 80 GSM weighs about 4.9896 g. A 500-sheet ream is therefore about 2.4948 kg before its wrapper.
What this estimate excludes
Ink, coating added after manufacture, binding, lamination, packaging and moisture can change the final weight. If you are planning postage or courier delivery, weigh a finished sample and include packing materials. The result is paper mass, not a shipping charge.
GSM is not paper thickness
Two papers with the same GSM can have different thickness and stiffness. This calculator does not estimate caliper, stack height or convert a US basis-weight label. Those conversions require additional information about the paper grade and its reference sheet size.
Frequently asked questions
Does one ream always mean 500 sheets?
500 is the example. Enter the actual pack quantity shown by your supplier.
Can I calculate business card weight?
Yes. Enter the finished card dimensions, GSM and quantity. Additional finishes are not included.
Can I use centimetres?
Multiply centimetres by 10 before entering the millimetre fields.