Inches to Millimetres
One inch is 25.4 millimetres. Metric and imperial distance units. The inch has been defined as exactly 2.54 cm since 1959, so every conversion on this page is exact rather than approximate.
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1 inch = 25.4 millimetres · open this conversion
Formula
millimetres = inches × 25.4
Inches to Millimetres table
| Inches | Millimetres |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 8 in | 203.2 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 15 in | 381 mm |
| 18 in | 457.2 mm |
| 20 in | 508 mm |
| 24 in | 609.6 mm |
| 30 in | 762 mm |
| 36 in | 914.4 mm |
| 40 in | 1,016 mm |
| 50 in | 1,270 mm |
| 60 in | 1,524 mm |
| 72 in | 1,828.8 mm |
| 100 in | 2,540 mm |
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Other length conversions
⇄ Millimetres to InchesInches to CentimetresInches to MetresInches to KilometresInches to FeetInches to YardsInches to Miles
Frequently asked questions
▸How many millimetres are in a inch?
One inch is 25.4 millimetres. millimetres = inches × 25.4.
▸How do I convert inches to millimetres?
Multiply the number of inches by 25.4. For example, 10 in × 25.4 = 254 mm.
▸What is the difference between inches and millimetres?
Inch (in) and Millimetre (mm) both measure length. Metric and imperial distance units. The inch has been defined as exactly 2.54 cm since 1959, so every conversion on this page is exact rather than approximate.
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