Convert Inches to Millimeters
Convert inches to millimeters (in to mm) instantly. Free, accurate inches to millimeters calculator with conversion formula and chart.
1 in = 25.4 mm
Conversion formula
1 inch = 25.4 millimeters
Multiply a value in inches by 25.4 to get millimeters; divide by the same number to convert back.
Inches to Millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
- For example, 12 inches is 304.8 millimeters.
- A value of 75 inches converts to 1,905 millimeters.
- Going the other way, 1 millimeter is 0.0393701 inches.
More length conversions
About Inches to Millimeters
Easily convert inches (in) to millimeters (mm) with this free, instant calculator. Enter a value in inches to see the equivalent in millimeters right away — accurate and calculated in your browser.
How to use Inches to Millimeters
- 1
Enter the number of inches you want to convert.
- 2
The equivalent value in millimeters appears instantly.
- 3
Switch units anytime to convert in either direction.
How to convert Inches to Millimeters
Enter any value in inches (in) and this calculator instantly shows the equivalent in millimeters (mm) using the exact internationally agreed conversion factor — no rounding tricks, no ads in the way, and it works offline once the page is loaded.
Use the swap button to convert in the other direction (millimeters to inches), or switch to any other length unit from the dropdown — the same page handles meters, kilometers, centimeters, millimeters, micrometers, nanometers, miles, yards, feet, inches, nautical miles.
Frequently Asked Questions
How do you convert inches to millimeters?
Enter your value in inches and the converter instantly shows the result in millimeters using the exact conversion factor.
Is the inches to millimeters converter free?
Yes — it's completely free, instant and requires no sign-up.
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