How to Convert Inches (in) to Millimeter (mm)

1 Inch (in) is equal to 25.4 Millimeter (mm).

To convert Inches into Millimeter, multiply Inches by 25.4

1 (in) x 25.4 = 25.4 (mm)

=> mm = in x 25.4

Example:

To convert 15 in to mm:

15 in x 25.4 = 381 mm