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Convert inches to millimeters

Convert inches (in) to millimeters (mm). 1 in = 25.4 mm, and 1 mm = 0.0393701 in.

1 in = 25.4 mm

Inches to MM formula

mm = in × 25.4

Multiply the number of inches by 25.4.

Example: To convert 1 in to millimeters: 1 × 25.4 = 25.4 mm.

Quick answers

What is 1 in in millimeters?
1 in = 25.4 mm
What is 6 in in millimeters?
6 in = 152.4 mm
What is 12 in in millimeters?
12 in = 304.8 mm
What is 24 in in millimeters?
24 in = 609.6 mm
What is 32 in in millimeters?
32 in = 812.8 mm

Inches to MM conversion table

MM to Inches table
inches (in)millimeters (mm)
0.25 in6.35 mm
0.5 in12.7 mm
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
4 in101.6 mm
5 in127 mm
6 in152.4 mm
7 in177.8 mm
8 in203.2 mm
9 in228.6 mm
10 in254 mm
11 in279.4 mm
12 in304.8 mm
14 in355.6 mm
16 in406.4 mm
18 in457.2 mm
20 in508 mm
24 in609.6 mm
27 in685.8 mm
30 in762 mm
32 in812.8 mm
36 in914.4 mm
40 in1,016 mm
48 in1,219.2 mm
55 in1,397 mm
65 in1,651 mm
75 in1,905 mm

Frequently asked questions

How many millimeters are in an inch?

There are 25.4 millimeters in an inch (1 in = 25.4 mm).

How do I convert inches to millimeters?

Multiply the number of inches by 25.4. To convert 1 in to millimeters: 1 × 25.4 = 25.4 mm.

Is the Inches to MM conversion exact?

Yes. Both units are defined exactly, so 1 inch is exactly 25.4 millimeters. Results on this page are rounded to six significant digits; pick more decimals in the converter if you need them.

What is 1 in in millimeters?

1 in = 25.4 mm.

How do I convert millimeters back to inches?

Use the reverse relationship: 1 mm = 0.0393701 in. The MM to Inches page has a converter and a full table.

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