how big a is mm
It is approximately 1/16 of an inch. So one millimeter is equals to 0.03937 inches. Now we will see How Big Is 8mm in inches? Answer is 8 mm equals 8 x 0.03937 = 0.3149606 inches. A centimeter is equal to 10 mm, so 8 mm would be a little less than 1 cm. 8 mm is equal to 0.8 cm.
A millimetre is one thousandth of a meter. and a meter is one thousandth of a kilometer. and a kilometer has something to do with the size of the Earth. Incidentally, a litre is one kilogram of water. addict Â· 9 years ago.