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Inches to millimeters

1 inch is 25.4 millimeters. Type any amount to convert it.

1 in equals

25.4 mm
Show in every length unit
millimeters25.4 mm
centimeters2.54 cm
meters0.0254 m
kilometers0.000025 km
inches1 in
feet0.083333 ft
yards0.027778 yd
miles0.000016 mi
nautical miles0.000014 nmi

How to convert inches to millimeters

millimeters = inches × 25.4

For example, 10 inches × 25.4 = 254 millimeters. Going the other way? Use millimeters to inches.

in to mm chart

inches (in)millimeters (mm)
0.1 2.54
0.25 6.35
0.5 12.7
1 25.4
2 50.8
3 76.2
4 101.6
5 127
6 152.4
7 177.8
8 203.2
9 228.6
10 254
12 304.8
15 381
20 508
25 635
30 762
40 1,016
50 1,270
75 1,905
100 2,540
250 6,350
500 12,700
1,000 25,400

Frequently asked questions

How do you convert inches to millimeters?

Use millimeters = inches × 25.4. One inch equals 25.4 millimeters.

How many millimeters are in one inch?

There are 25.4 millimeters in one inch.

What is the symbol for inches and millimeters?

Inches are written in; millimeters are written mm.

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