Conversion guide

How to Convert inches to mm

A complete guide with formula, examples, chart, and instant calculator link.

1. Formula

1 inch [in] = 25.4 millimeter [mm]

Enter your value in inch [in], apply the formula, and read the result in millimeter [mm]. The calculator handles the arithmetic instantly.

1 inch [in] = 25.4 millimeter [mm]

2 inch [in] = 50.8 millimeter [mm]

5 inch [in] = 127 millimeter [mm]

10 inch [in] = 254 millimeter [mm]

20 inch [in] = 508 millimeter [mm]