With all the sizes of dice available, it's sometimes hard to know which size you need. One inch is equvalent to 25.4 millimeters, so a 16mm dice is roughly 2/3 of an inch in size, and a 19mm dice is about 3/4 of an inch. Dice are measured in millimeters (mm) from side to side, and while dice can range in size from 5mm all the way up to 100mm or more, there are a few dice sizes that are considered 'standard': 5mm, 12mm, 16mm, 19mm, 25mm, and 50mm.
