If you were to fold a piece of paper in half 42 times, it would reach the moon.

You can count the distance with that.

It is pretty much impossible to fold a single sheet of paper more than about 8 times -- though Myth Busters once folded a giant sheet the size of a football field 10 times. The resulting thickness (after hitting it with a bulldozer) was almost a foot tall, though there was quite a bit of air mixed in with the 1,024 sheets. The formula for finding out how many of something you'll have after doubling it N number of times is as follows where O is the original number (or size in our case).

o * 2^(n)

A standard sheet of paper is about 0.1 mm so 42 folds would give us this:

0.1 * 2^(42) = 439,804,651,110 mm

That's 440 billion millimeters, or 439,804 kilometers. The moon *on average* is 384,400 kilometers from Earth according to Google. I'd say this checks out.

To help visualize the data, here is a quick graph that tracks the thickness of the paper for each fold.

Source:

Distance of the Moon