A piece of A4 paper is 0. 1mm thick, and 10000 pieces of A4 paper are stacked to be 1m thick.

1000 paper is about 10 cm tall. If it is 1000 A4 copy paper with good quality, there should be a high imitation of 12-3 cm. It depends on the quality of the paper and whether it is new. If it is new, it will be thinner and not so high. If it's old, it will stack higher. You can take 10 sheets of paper to measure. Roughly how thick it is, multiply it by 100 to get its thickness.