How do you convert 57 x 86 x 71cm to inches?

There are 2.54 centimetres in an inch.

So

57 centimetres = 22.440945 inches

86 centimetres = 33.858268 inches

71 centimetres = 27.952756 inches

to convert this to cubic inches we multiply all of them together and that gives = 21238.83 cubic inches - rounded to two decimal places.