According to the query of Baidu Education, 1 inch =2.54 cm. From this calculation, it can be concluded that 12 inch equals 2.54 times 12 equals 30.48 cm, that is, the diameter of 12 inch pizza is 30.48 cm.

In English, 12 inch (inch) is 1 foot (foot), and 36 inch is 1 yard. 1 mil = 1 1 000 inch = 0.00254cm = 0.0254mm.1inch = 1000 mile = 2.54cm = 25.4mm./kloc-0.