Convert Inch to Millimeter
Enter a value in Inch to see it instantly in Millimeter, or use the reverse converter below.
Inch
Definition: A US customary and imperial unit equal to exactly 25.4 millimeters, with 12 inches to a foot.
Current use: Used in the US for screen sizes, paper, tools, and rainfall, and in the UK for height.
Millimeter
Definition: One thousandth of a meter, the SI base unit of length.
Current use: Used for small, precise measurements in engineering, printing, and manufacturing tolerances.
Inch to Millimeter Conversion Table
| Inch [in] | Millimeter [mm] |
|---|---|
| 0.01 in | 0.254 mm |
| 0.1 in | 2.54 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
| 1000 in | 25400 mm |
How to Convert Inch to Millimeter
1 mm = 0.0393700787 in
Example: convert 1 in to mm:
Millimeter to Inch Conversion Table
| Millimeter [mm] | Inch [in] |
|---|---|
| 0.01 mm | 0.0003937008 in |
| 0.1 mm | 0.0039370079 in |
| 1 mm | 0.0393700787 in |
| 2 mm | 0.0787401575 in |
| 3 mm | 0.1181102362 in |
| 5 mm | 0.1968503937 in |
| 10 mm | 0.3937007874 in |
| 20 mm | 0.7874015748 in |
| 50 mm | 1.968503937 in |
| 100 mm | 3.937007874 in |
| 1000 mm | 39.3700787402 in |
Quick Estimate
For a quick mental estimate, 1 in is about 25 mm, and 1 mm is about 0.039 in. Use the exact calculator above when accuracy matters, such as for money, medicine, engineering or anything you will buy or sell.
Frequently Asked Questions
How many Millimeter are in 1 Inch?
1 Inch (in) equals 25.4 Millimeter (mm).
How do I convert Inch to Millimeter?
Multiply the value in in by 25.4 to get mm. To go the other way, multiply mm by 0.0393700787.
What is 10 Inch in Millimeter?
10 in = 254 mm.
What is 100 Inch in Millimeter?
100 in = 2540 mm.
What is a Inch?
A US customary and imperial unit equal to exactly 25.4 millimeters, with 12 inches to a foot. Used in the US for screen sizes, paper, tools, and rainfall, and in the UK for height.
What is a Millimeter?
One thousandth of a meter, the SI base unit of length. Used for small, precise measurements in engineering, printing, and manufacturing tolerances.
How many Inch are in 1 Millimeter?
1 Millimeter (mm) equals 0.0393700787 Inch (in).
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