How do you convert inches to millimeters?

To convert inches to millimeters, multiply by 25.4. For example, 1 in is 25.4 mm.

How many millimeters are in a inch?

There are 25.4 millimeters in one inch.

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Converters · Length

1 Inches to Millimeters

1 in =

25.4 mm

1 inches equals 25.4 millimeters

How to convert inches to millimeters

To get millimeters, multiply by 25.4.

mm = in × 25.4

Worked example: 1 × 25.4 = 25.4 mm.

Going the other way, multiply by 0.03937007874 — one millimeter is 0.03937007874 inches.

Values near 1 in

Inch	Millimeter
0.5 in	12.7 mm
2 in	50.8 mm
3 in	76.2 mm

Inch to Millimeter — common values

Inch	Millimeter
1 in	25.4 mm
2 in	50.8 mm
3 in	76.2 mm
5 in	127 mm
10 in	254 mm
25 in	635 mm
50 in	1270 mm
100 in	2540 mm

Convert Inch to other units

in → m in → km in → cm in → mm in → mi in → yd in → ft in → nmi

← Reverse: Millimeter to Inch

Questions

How do you convert inches to millimeters?: To convert inches to millimeters, multiply by 25.4. For example, 1 in is 25.4 mm.
How many millimeters are in a inch?: There are 25.4 millimeters in one inch.
How do you convert millimeters back to inches?: Go the other way: multiply by 0.03937007874. One millimeter is 0.03937007874 inches.

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