Convert Inches to Millimeters

Convert inches (in) to millimeters (mm) with our free online converter. Includes formula, conversion table, and common examples.

From

in

Inches

To

mm

Millimeters

How It Works

Multiply the inch value by 25.4

Example: 1 in = 25.4 mm

Inches to Millimeters Table

Inches (in)	Millimeters (mm)
1 in	25.4 mm
2 in	50.8 mm
3 in	76.2 mm
4 in	101.6 mm
5 in	127 mm
6 in	152.4 mm
7 in	177.8 mm
8 in	203.2 mm
9 in	228.6 mm
10 in	254 mm
12 in	304.8 mm
15 in	381 mm
20 in	508 mm
25 in	635 mm
30 in	762 mm

Did You Know?

Precision engineering often requires converting between inches and millimeters.
A US dime is about 17.91 mm (0.705 inches) in diameter.

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