inches to millimeters
Convert inch to millimeter — instant, free, with the formula shown.
1 in=25.4 mm
How to convert inch to millimeter
To convert inch to millimeter, multiply by 25.4:
mm = in × 25.4
For example, 10 in × 25.4 = 254 mm.
in to mm 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 | 1270 mm |
| 100 in | 2540 mm |
| 250 in | 6350 mm |
| 500 in | 12700 mm |
| 1000 in | 25400 mm |
Other inch conversions
Convert to millimeter from another unit
in to mm — frequently asked
How many millimeters are in 1 inch?
1 inch = 25.4 millimeters (in × 25.4 = mm).
What is the formula to convert inch to millimeter?
Multiply your inch value by 25.4 to get millimeter.
How do I convert 10 inches to millimeters?
10 in = 254 mm. For 100 in the answer is 2540 mm. Use the calculator on this page for any other value.
When to convert inch to millimeter
1Engineering and construction (mm to feet, meters to inches)
2Running, cycling and athletics (km to miles, miles to yards)
3International shipping and travel (nautical miles, kilometers)
4Manufacturing tolerances (micrometers and nanometers)
Length conversion — common questions
How many feet are in 1 meter?
1 meter equals approximately 3.2808 feet. The exact conversion factor is 1 ft = 0.3048 m.
How do I convert kilometers to miles?
Multiply the kilometer value by 0.621371. For example, 10 km × 0.621371 ≈ 6.2137 miles.
Is 1 yard exactly 3 feet?
Yes. By definition 1 yard = 3 feet = 36 inches = 0.9144 meters.
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