How many millimeters (mm) in an inch?
There are 25.4 millimeters (mm) in 1 inch. To convert inches to mm, multiply the inch value by 25.4.
For example, to find out how many millimeters in an inch and a half, multiply 1.5 by 25.4, that makes 38.1 mm in 1.5 inches.
1 Inch (in) = 25.4 Millimeter (mm)
How to convert millimeters (mm) to inches?
1 Millimeter (mm) is equal to 0.0393701 inch. To convert mm to inches, multiply the millimeter value by 0.0393701 or divide by 25.4.
For example, to convert 55 mm to inches, divide 55 by 25.4, that makes 2.16535 inches in 55 mm.
1 Millimeter (mm) = 0.0393701 Inch (in)
You may also use this length and distance units conversion calculator tool to convert between inches, millimeters and all other length and distance units.
What is Inch?
Inch is an imperial and United States Customary length unit. 1 Inch = 25.4 mm. The symbol is "in".
What is Millimeter?
Millimeter (millimetre) is a metric system length unit. 1 mm = 0.0393701 inch. The symbol is "mm".