Length converter
Inch to Millimeter Converter
Convert in to mm or reverse with one click. Type a value below for an instant result.
Inch in
Millimeter mm
in → mm · runs in your browser, no server
How to convert inch to millimeter
Inch (in) and Millimeter (mm) both measure length. Whether you are studying, traveling, cooking, or working on a project, converting between them should be fast and accurate.
This page converts inch to millimeter — ideal when American or British measurements need to match metric specs, school assignments, or international standards.
The standard relationship used on this page means that 1 inch equals 25.4 mm. Enter any number in the calculator — use the swap button to reverse the direction without leaving the page.
Converting 12 in gives 304.8 mm. This is a practical reference when switching between inch and millimeter for travel distances, screen sizes, furniture dimensions, and construction plans.
Need millimeter to inch instead? Try our Millimeter to Inch converter. mm → inch
in to mm conversion table
| in | mm |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
| 150 | 3810 |
| 200 | 5080 |
mm to in conversion table
Or click the swap button in the converter to switch from mm to in.
| mm | in |
|---|---|
| 1 | 0.039370 |
| 2 | 0.078740 |
| 6 | 0.236220 |
| 12 | 0.472440 |
| 24 | 0.944881 |
| 36 | 1.417322 |
| 48 | 1.889763 |
| 60 | 2.362204 |
| 72 | 2.834645 |
Frequently asked questions
How many millimeters are in 1 inch? +
One inch equals 25.4 mm. Use the converter above for any value — results are calculated locally with full precision.
How do I convert in to mm? +
Use the formula: mm = in × 25.4. Enter your value in the calculator and the result appears instantly. Click the swap button to convert mm back to in.
How many inchs are in 1 millimeter? +
One millimeter equals 0.039370 in. Swap the converter direction to work backwards from mm to in.
What is 10 in in mm? +
10 in is 254 mm. See the conversion table on this page for more common values.
When would I convert inch to millimeter? +
This conversion is useful for travel distances, screen sizes, furniture dimensions, and construction plans. ConvertHub runs entirely in your browser — no data is uploaded to any server.
Is inch to millimeter the same as millimeter to inch? +
They are inverse operations. This page focuses on in → mm with examples and tables for that direction. For mm → in, use our separate millimeter to inch converter page.