For informational purposes only. Confirm the local standard before any transaction.
How to convert Inch to Millimeter
To convert Inch to Millimeter, multiply the area by 25.4. One Inch (in) equals 25.4 Millimeter (mm), and conversely one Millimeter equals 0.0393701 Inch. The Inch is an imperial unit of length equal to 1/12 of a foot, while the Millimeter is a metric unit of length equal to one-thousandth of a metre. Use the calculator below to convert any value between the two units, or read the conversion table and worked examples that follow.
Formula
Millimeter = Inch × 25.4
For example, to convert 10 Inch to Millimeter, multiply 10 by 25.4 to get 254 Millimeter.
Inch to Millimeter conversion table
Inch (in)
Millimeter (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
20 in
508 mm
25 in
635 mm
50 in
1,270 mm
100 in
2,540 mm
500 in
12,700 mm
1,000 in
25,400 mm
Frequently asked questions
How many Millimeter are there in 1 Inch?
There are 25.4 Millimeter (mm) in 1 Inch (in).
How do you convert Inch to Millimeter?
Multiply the number of Inch by 25.4. The formula is: Millimeter = Inch × 25.4.
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