Approx...400reams
Paper quality is expressed as weight per area. Office standard A4 is 80 grams per square metre.
A sheet of A0 paper has an area of 1 m2, A1 is half the size of A0, A2 half A1, A3 half A2, and A4 half of A3; so there are 16 sheets of A4 to the square metre.
Therefore the weight of one sheet of A4 is 80 divided by 16, which is 5 grams.
The number of sheets needed to make one kilogram is 1000 divided by 5, which is 200 sheets.
One tonne is 1000 kilograms so one tonne of A4 would need 200 000 sheets.
A ream of paper is 500 sheets, so 200 000 sheets is 400 reams.
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A ream is 500 identical sheets, but can fall between 472 and 516 although 500 is now internationally accepted. The number of sheets refers to any size, A4 included
A typical copy-paper carton can hold about 10 reams of paper, which is equivalent to 5,000 sheets of paper. The weight capacity can vary depending on the type of paper, but it generally ranges from 20 to 50 pounds.
The most common size of copy paper, notebook paper, and typing paper in the US is 8½ inches wide by 11 inches high. In many other countries, A4 is the most common size of paper; A4 paper is 8.3 inches wide by 11.7 inches tall.
The mass of a sheet of copy paper can vary depending on the weight or thickness of the paper. Typically, a standard sheet of copy paper weighs around 4 to 5 grams.
All copy machines can process colored copy paper. If you are making copies of text the results should be good. However, copying color photos onto colored paper can give strange results.
For 80 gsm paper, it is approx 2.495 kilograms.