Inches to Millimeters Conversion

How many millimeters in an inch?

Inches to millimeters length units conversion factor is 25.4. To find out how many millimeters in inches, multiply the inch value by 25.4 or use the converter.

1 Inch = 25.4 Millimeters

There are 25.4 millimeters in an inch, because for both imperial and US customary measurement systems, one foot is defined as 30.48 centimeters (or 304.8 millimeters) exactly by an international agreements and there are 12 inches in a foot, that makes 304.8 / 12 = 25.4 mm in an inch.

For example, to find out how many millimeters there are in an inch and a half, multiply the inch value by the conversion factor, that makes 1.5 * 25.4 = 38.1 millimeters in 1.5 inches.

Inch is an imperial and US customary measurement systems length unit. 1 inch equals to 25.4 millimeters and 2.54 centimeters. The abbreviation is "in".

Millimeter is a metric length unit and equal to one thousandth of a meter. It is used to measure small distances in engineering and machining. The abbreviation is "mm".

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Inches to Millimeters Conversion Table

InchMillimeterInchMillimeterInchMillimeterInchMillimeter
1 in 25.4 mm 26 in 660.4 mm 51 in 1295.4 mm 76 in 1930.4 mm
2 in 50.8 mm 27 in 685.8 mm 52 in 1320.8 mm 77 in 1955.8 mm
3 in 76.2 mm 28 in 711.2 mm 53 in 1346.2 mm 78 in 1981.2 mm
4 in 101.6 mm 29 in 736.6 mm 54 in 1371.6 mm 79 in 2006.6 mm
5 in 127 mm 30 in 762 mm 55 in 1397 mm 80 in 2032 mm
6 in 152.4 mm 31 in 787.4 mm 56 in 1422.4 mm 81 in 2057.4 mm
7 in 177.8 mm 32 in 812.8 mm 57 in 1447.8 mm 82 in 2082.8 mm
8 in 203.2 mm 33 in 838.2 mm 58 in 1473.2 mm 83 in 2108.2 mm
9 in 228.6 mm 34 in 863.6 mm 59 in 1498.6 mm 84 in 2133.6 mm
10 in 254 mm 35 in 889 mm 60 in 1524 mm 85 in 2159 mm
11 in 279.4 mm 36 in 914.4 mm 61 in 1549.4 mm 86 in 2184.4 mm
12 in 304.8 mm 37 in 939.8 mm 62 in 1574.8 mm 87 in 2209.8 mm
13 in 330.2 mm 38 in 965.2 mm 63 in 1600.2 mm 88 in 2235.2 mm
14 in 355.6 mm 39 in 990.6 mm 64 in 1625.6 mm 89 in 2260.6 mm
15 in 381 mm 40 in 1016 mm 65 in 1651 mm 90 in 2286 mm
16 in 406.4 mm 41 in 1041.4 mm 66 in 1676.4 mm 100 in 254 mm
17 in 431.8 mm 42 in 1066.8 mm 67 in 1701.8 mm 125 in 3175 mm
18 in 457.2 mm 43 in 1092.2 mm 68 in 1727.2 mm 150 in 381 mm
19 in 482.6 mm 44 in 1117.6 mm 69 in 1752.6 mm 175 in 4445 mm
20 in 508 mm 45 in 1143 mm 70 in 1778 mm 200 in 508 mm
21 in 533.4 mm 46 in 1168.4 mm 71 in 1803.4 mm 250 in 635 mm
22 in 558.8 mm 47 in 1193.8 mm 72 in 1828.8 mm 300 in 762 mm
23 in 584.2 mm 48 in 1219.2 mm 73 in 1854.2 mm 500 in 1270 mm
24 in 609.6 mm 49 in 1244.6 mm 74 in 1879.6 mm 750 in 1905 mm
25 in 635 mm 50 in 127 mm 75 in 1905 mm 1000 in 2540 mm
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