How to convert
mm = inch × 25.4
Reverse: inch = mm × 0.0393700787
mm = inch × 25.4
Reverse: inch = mm × 0.0393700787
Converting inch to mm
inch and mm (millimeter) are units of length. One inch equals 25.4 mm. Just type a value in the box above to convert instantly — useful for recipes, drawings, product specs and travel between metric and imperial units.
inch to mm conversion chart
| inch | mm |
|---|---|
| 1 inch | 25.4 mm |
| 2 inch | 50.8 mm |
| 3 inch | 76.2 mm |
| 5 inch | 127 mm |
| 10 inch | 254 mm |
| 20 inch | 508 mm |
| 50 inch | 1,270 mm |
| 100 inch | 2,540 mm |
Frequently asked questions
- How many mm are in one inch?
- 1 inch = 25.4 mm.
- How do I convert mm back to inch?
- Multiply the mm value by 0.0393700787 to get inch.
- Is my input sent to a server?
- No. Everything is calculated locally in your browser and nothing is uploaded or stored.