If Earth were a four story building with a shingle roof how thick would the atmosphere be?

If Earth were scaled down to a four-story building, the atmosphere would be roughly equivalent to the thickness of a sheet of paper. This is because the Earth's atmosphere is relatively thin compared to the size of the planet; it extends about 10 kilometers (6 miles) above sea level, which is only a tiny fraction of Earth's overall radius of about 6,371 kilometers (3,959 miles). Thus, in this analogy, the atmosphere would be just a few millimeters thick.