Please enter a value below to convert inches to millimeters:
In order to do a reverse conversion from millimeters to inches clear values in the above fields and input the value in the “Millimeters” field or go to millimeters to inches converter page.
Facts about Inch
Basic facts: An inch is a unit of length in the United States customary and British imperial systems of measurement [symbol: in]. It is equivalent to 1/36 yard or 1/12 of a foot, meaning there are 36 inches in a yard and 12 inches in a foot. In 1959, an inch was defined to be equal to exactly 25.4 millimeters.
History: The word “inch” is derived from the Roman uncia “twelfth”, the term “inch” is also sometimes used to translate similar units in other measurement systems, usually viewed as deriving from the width of the human thumb, where the length was obtained from averaging the width of 3 thumbs: a small, a medium, and a large one.
In the past, there have been a number of various standards for the inch with the present definition being based on the international yard. One of the earlier definitions of the inch was based on barleycorns [where an inch was equivalent to the length of 3 grains of dry, round barley placed end-to-end].
Use: The inch is mainly used in the United States, the United Kingdom, and Canada. It is also sometimes used in Japan and in other countries as well, in relation to electronic parts, such as the size of display screens.
Facts about Millimeter
Basic facts: A millimeter [American spelling] or millimetre [international spelling – symbol: mm] is a unit of length in the SI (International System of Units). The millimeter is equivalent to one-thousandth of a meter and it is defined as the distance traveled by light in 1/299 792 458 000 of a second.
History: The prefix “milli” is one of many metric prefixes. It shows the base unit’s one-thousandth, in this instance, the meter. The current definition is based on the distance traveled by the speed of light in a given amount of time, however, the definition of the meter has changed over time. The relationship between the meter and the millimeter is continuous. Before this definition, the meter was based on the length of a prototype meter bar. The meter has been re-defined based on the changes made to the definition of a second, in 2019.
Use: The millimeters are used to exactly measure the length of small or narrow objects. On a metric ruler or stick it is the smallest unit of length.
How many millimeters in a inch?
1 inch is equivalent to 25.4 millimeters. Use 25.4 as the factor to convert inches to millimeters. Below find some popular inches to millimeters conversion questions:
- How many millimeters in 2 inches? 2 inches x 25.4 = 50.8 number millimeters
- How many millimeters in 3 inches? 3 inches x 25.4 = 76.2 number millimeters
- How many millimeters in 5 inches? 5 inches x 25.4 = 127 number millimeters
- How many millimeters in 10 inches? 10 inches x 25.4 = 254 number millimeters
- How many millimeters in 20 inches? 20 inches x 25.4 = 508 number millimeters
- How many millimeters in 50 inches? 50 inches x 25.4 = 1270 number millimeters
- How many millimeters in 100 inches? 100 inches x 25.4 = 2540 number millimeters
- How many millimeters in 1000 inches? 1000 inches x 25.4 = 25400 number millimeters
Inches to Millimeters Conversion Chart
| Inches | Millimeters | Inches | Millimeters | Inches | Millimeters | Inches | Millimeters |
|---|---|---|---|---|---|---|---|
| 1 | 25.4 | 26 | 660.4 | 51 | 1295.4 | 76 | 1930.4 |
| 2 | 50.8 | 27 | 685.8 | 52 | 1320.8 | 77 | 1955.8 |
| 3 | 76.2 | 28 | 711.2 | 53 | 1346.2 | 78 | 1981.2 |
| 4 | 101.6 | 29 | 736.6 | 54 | 1371.6 | 79 | 2006.6 |
| 5 | 127 | 30 | 762 | 55 | 1397 | 80 | 2032 |
| 6 | 152.4 | 31 | 787.4 | 56 | 1422.4 | 81 | 2057.4 |
| 7 | 177.8 | 32 | 812.8 | 57 | 1447.8 | 82 | 2082.8 |
| 8 | 203.2 | 33 | 838.2 | 58 | 1473.2 | 83 | 2108.2 |
| 9 | 228.6 | 34 | 863.6 | 59 | 1498.6 | 84 | 2133.6 |
| 10 | 254 | 35 | 889 | 60 | 1524 | 85 | 2159 |
| 11 | 279.4 | 36 | 914.4 | 61 | 1549.4 | 86 | 2184.4 |
| 12 | 304.8 | 37 | 939.8 | 62 | 1574.8 | 87 | 2209.8 |
| 13 | 330.2 | 38 | 965.2 | 63 | 1600.2 | 88 | 2235.2 |
| 14 | 355.6 | 39 | 990.6 | 64 | 1625.6 | 89 | 2260.6 |
| 15 | 381 | 40 | 1016 | 65 | 1651 | 90 | 2286 |
| 16 | 406.4 | 41 | 1041.4 | 66 | 1676.4 | 91 | 2311.4 |
| 17 | 431.8 | 42 | 1066.8 | 67 | 1701.8 | 92 | 2336.8 |
| 18 | 457.2 | 43 | 1092.2 | 68 | 1727.2 | 93 | 2362.2 |
| 19 | 482.6 | 44 | 1117.6 | 69 | 1752.6 | 94 | 2387.6 |
| 20 | 508 | 45 | 1143 | 70 | 1778 | 95 | 2413 |
| 21 | 533.4 | 46 | 1168.4 | 71 | 1803.4 | 96 | 2438.4 |
| 22 | 558.8 | 47 | 1193.8 | 72 | 1828.8 | 97 | 2463.8 |
| 23 | 584.2 | 48 | 1219.2 | 73 | 1854.2 | 98 | 2489.2 |
| 24 | 609.6 | 49 | 1244.6 | 74 | 1879.6 | 99 | 2514.6 |
| 25 | 635 | 50 | 1270 | 75 | 1905 | 100 | 2540 |