Inches to Millimeters Converter (in to mm)
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Formula
To convert inches to millimeters, multiply the value by 25.4.
mm = in × 25.4
Example calculation
Convert 5 in to mm:
5 in × 25.4 = 127 mm
Conversion table
| in | mm |
|---|---|
| 1 | 25.4000 |
| 2 | 50.8000 |
| 3 | 76.2000 |
| 4 | 101.6000 |
| 5 | 127.0000 |
| 6 | 152.4000 |
| 7 | 177.8000 |
| 8 | 203.2000 |
| 9 | 228.6000 |
| 10 | 254.0000 |
| 15 | 381.0000 |
| 20 | 508.0000 |
| 25 | 635.0000 |
| 30 | 762.0000 |
| 35 | 889.0000 |
| 40 | 1016.0000 |
| 45 | 1143.0000 |
| 50 | 1270.0000 |
| 55 | 1397.0000 |
| 60 | 1524.0000 |
| 65 | 1651.0000 |
| 70 | 1778.0000 |
| 75 | 1905.0000 |
| 80 | 2032.0000 |
| 85 | 2159.0000 |
| 90 | 2286.0000 |
| 95 | 2413.0000 |
| 100 | 2540.0000 |
| 200 | 5080.0000 |
| 500 | 12700.0000 |
| 1000 | 25400.0000 |
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About the units
- Inch (in)
- Used for screen sizes, tools and everyday lengths in the US and UK. Since 1959 it is defined as exactly 25.4 millimetres.
- Millimeter (mm)
- Common in engineering drawings, rainfall and small measurements in most countries. One thousandth of a metre.
Frequently asked questions
- How do I convert inches to millimeters?
- To convert inches to millimeters, multiply the value by 25.4.
- How many millimeters are in 1 inch?
- 1 inch equals 25.4 mm.
- How many millimeters are in 10 inches?
- 10 in equals 254 mm.
- How do I convert millimeters back to inches?
- Use the reverse converter: 1 millimeter equals 0.0393701 in.
- Is this converter accurate?
- Yes. It uses the exact SI/NIST definitions of each unit and shows up to 6 significant digits.
Related conversions
- Reverse conversion: millimeters → inches
- millimeters → centimeters
- centimeters → millimeters
- millimeters → meters
- meters → millimeters
- millimeters → kilometers
- kilometers → millimeters
- millimeters → feet
- feet → millimeters