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Length & Distance converter
Inches to Millimeters
Convert inches (in) to millimeters (mm) instantly. Type a value in either box — it works both ways.
1 in = 25.4 mm
Formula
Millimeters = inches × 25.4ADVERTISEMENT
Inches to Millimeters conversion chart
| Inches | Millimeters |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
About inches and millimeters
Both the inch and the millimeter measure length. A inch is larger than a millimeter, so the numbers change accordingly. Metric units (mm, cm, m, km) are used in most of the world, while inches, feet, yards and miles are standard in the United States.
Related converters
Centimeters to Inchescm → inInches to Centimetersin → cmMillimeters to Inchesmm → inMeters to Feetm → ftFeet to Metersft → mKilometers to Mileskm → mi
Frequently asked questions
How many millimeters are in a inch?
There are 25.4 millimeters in one inch (1 in = 25.4 mm).
How do you convert inches to millimeters?
Multiply the number of inches by 25.4 to get millimeters. The calculator above does this automatically as you type.
What is 10 in in mm?
10 in = 254 mm. See the full conversion chart above for more common values.