Inches (in) to millimeters (mm)

1 inch = 25.4 millimeters

To convert inches to millimeters, multiply the length in inches by the conversion factor 25.4.

The conversion formula is :
millimeters = inches × 25.4

Here's the calculation to convert 1 in to mm :
1 inch × 25.4 = 25.4 millimeters

Therefore, 1 inch is equal to 25.4 millimeters

An inch is a unit of length in the British imperial and US customary systems of measurement. It is defined as exactly 2.54 centimeters. The inch is abbreviated using the symbols in or " (e.g. 1 in or 1").

A millimeter is a unit of length in the International System of Units (SI), equal to one thousandth of a meter. It is abbreviated using the symbol mm (e.g. 25.4 mm).