Inches to Millimeters
Convert inches to millimeters instantly and accurately, both ways.
🔒 Instant, accurate, and runs entirely in your browser
Formula: 1 in = 25.4 mm
Inches to Millimeters
To convert inches to millimeters, multiply the value by 25.4. For example, 1 in is 25.4 mm. Type any number above and the result updates instantly — and you can convert in the other direction just as easily. Everything runs in your browser.
Inches to Millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.5 in | 12.7 mm |
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 24 in | 609.6 mm |
Other popular conversions
How it works
Three steps. No sign-up, no upload, no wait.
1
Enter a value
Type a number of inches in the first box.
2
Read the result
The value in millimeters updates instantly.
3
Convert either way
You can also type in the millimeters box to convert back.
🔒
Private by design.Everything happens right here in your browser. Your files are never uploaded — we never see them.
Frequently Asked Questions
How many millimeters are in an inch? ▼
One inch equals 25.4 millimeters.
What is the formula to convert inches to millimeters? ▼
Use
1 in = 25.4 mm.Is this converter accurate? ▼
Yes — it uses the exact internationally-defined conversion factor and updates live as you type. It runs entirely in your browser.
Do I need to install anything or sign up? ▼
No. It works instantly in your browser — no account, no install, nothing uploaded.