The area of A0 is 1 metre2. A1 has half that area, A2 is a half of A1, and so on. Thus the area of A4 is 1/16 m2.
If the paper has a mass of 80 grams per m2 then 1 sheet of A4 will have a mass of 5 grams.
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You need more information. You need to know how much paper you are dealing with (a ream, or some other sheet count) and also the specific grade of paper. Reams of different paper can weigh differently.
How much does a 16 foot 12 inch mdf weigh
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About 1-1.4 grams.
A4 is a standard paper size (1/16 square metres). The standard for printer paper is 80 gsm (grams per square metre). An 80 gsm sheet of A4 paper weighs 5 grams.