Inches to Millimeters Converter
Convert Inches (in) to Millimeters (mm) instantly.
25.4
1 in = 25.4 mm
Common Inches to Millimeters Conversions
Other Length Conversions
Understanding Inches to Millimeters
Inches and Millimeters are units that measure the same physical quantity, so any value in inches can be expressed in millimeters. For reference, 1 in equals 25.4 mm. Type any number into the calculator above to convert it instantly, or use the table below for the most commonly searched inches-to-millimeters values.
Inches to Millimeters conversion table
| Value | Result |
|---|---|
| 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 |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
Frequently asked questions
How do I convert Inches to Millimeters?
Enter the inches value in the converter above and the equivalent in millimeters appears instantly. You can also read off the most common values from the conversion table on this page.
How many millimeters are in one inches?
1 in is equal to 25.4 mm.
Is this converter free to use?
Yes. CalcConvert is completely free, runs in your browser, and requires no sign-up or installation.