🖨️ Print & Typography
inches to mm Converter
Convert inches to mm instantly with a reference conversion table.
Quick answer: To convert inches to mm, multiply by 25.4. For example, 1 inches = 25.4 mm. Use the calculator below for any value.
inches to mm
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Common conversions
| inches | mm |
|---|
Formula:
How to convert inches to mm
1
Enter your value
Type the number of inches you want to convert into the left box. The result in mm appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — mm to inches. Your current value carries across so you don't have to re-enter anything.
3
About inches and mm
inches and mm are common print measurements.
📊 Common conversions at a glance
| inches | mm |
|---|---|
| 0.039 | 0.9906 |
| 0.1 | 2.54 |
| 0.25 | 6.35 |
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
Reviewed for 2026. inches ↔ mm conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert inches to mm?
To convert inches to mm, multiply by 25.4. Or use the calculator above for instant results.
How many mm are in 1 inches?
1 inches equals 25.4 mm.
Is the inches to mm converter free?
Yes, the inches to mm converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.