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1 in = 25.4 mm
Open in Unit ConverterFormula
mm = in × 25.4
How to convert
To convert inches to millimeters, multiply the value by 25.4. For example, 2 in = 50.8 mm.
Conversion table
| Inches (in) | mm |
|---|---|
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 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 |
| 24 in | 609.6 mm |
| 36 in | 914.4 mm |
About these units
Metric lengths step by powers of ten: 10 mm = 1 cm, 100 cm = 1 m and 1,000 m = 1 km. Imperial and US customary lengths have been defined exactly in metric since 1959: 1 inch = 2.54 cm, 1 foot = 12 inches = 30.48 cm, 1 yard = 3 feet = 0.9144 m and 1 mile = 1,760 yards = 1,609.344 m. Because these definitions are exact, the conversions on this page are exact up to rounding.
FAQ
› How do I convert in to mm?
1 in = 25.4 mm. To convert, multiply the value by 25.4: 2 in = 50.8 mm.
› What is 1 mm in in?
1 mm = 0.03937007874 in. The reverse formula is in = mm ÷ 25.4.
› How many centimeters are in an inch?
Exactly 2.54 cm. The international inch has been defined this way since 1959.
› How do I convert a height in feet and inches?
Multiply the feet by 30.48 and the inches by 2.54, then add them: 5 ft 10 in = 152.4 + 25.4 = 177.8 cm.