How many millimeters in an inch?
There are 25.4 millimeters in an inch. To convert inches to mm, multiply the inch value by 25.4.
For example, to find out how many millimeters there are in an inch and a half, multiply 1.5 by 25.4, that makes 38.1 mm in an inch and a half.
inches to mm formula
mm = in * 25.4
1 Inch = 25.4 Millimeters
What is an Inch?
Inch is an imperial and United States Customary length unit. 1 in = 25.4 mm. The symbol is "in".
You may also use length conversion to convert all length units.