Please enter a value below to convert millimeters to inches:
In order to do a reverse conversion from inches to millimeters clear values in the above fields and input the value in the “Inches” field or go to inches to millimeters converter page.
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.
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.
How many inches in a mm?
1 mm is equivalent to 0.0393700787 inches. Use 0.0393700787 as the factor to convert millimeters to inches. Below find some popular millimeters to inches conversion questions:
- How many inches in 2 millimeters? 2 millimeters x 0.0393700787 = 0.0787401574 number inches
- How many inches in 3 millimeters? 3 millimeters x 0.0393700787 = 0.1181102361 number inches
- How many inches in 5 millimeters? 5 millimeters x 0.0393700787 = 0.1968503935 number inches
- How many inches in 10 millimeters? 10 millimeters x 0.0393700787 = 0.393700787 number inches
- How many inches in 20 millimeters? 20 millimeters x 0.0393700787 = 0.787401574 number inches
- How many inches in 50 millimeters? 50 millimeters x 0.0393700787 = 1.968503935 number inches
- How many inches in 100 millimeters? 100 millimeters x 0.0393700787 = 3.93700787 number inches
- How many inches in 1000 millimeters? 1000 millimeters x 0.0393700787 = 39.3700787 number inches
Millimeters to Inches Conversion Chart
| Millimeters | Inches | Millimeters | Inches | Millimeters | Inches | Millimeters | Inches |
|---|---|---|---|---|---|---|---|
| 1 | 0.0393700787 | 26 | 1.023622046 | 51 | 2.007874014 | 76 | 2.992125981 |
| 2 | 0.0787401574 | 27 | 1.062992125 | 52 | 2.047244092 | 77 | 3.03149606 |
| 3 | 0.1181102361 | 28 | 1.102362204 | 53 | 2.086614171 | 78 | 3.070866139 |
| 4 | 0.1574803148 | 29 | 1.141732282 | 54 | 2.12598425 | 79 | 3.110236217 |
| 5 | 0.1968503935 | 30 | 1.181102361 | 55 | 2.165354329 | 80 | 3.149606296 |
| 6 | 0.2362204722 | 31 | 1.22047244 | 56 | 2.204724407 | 81 | 3.188976375 |
| 7 | 0.2755905509 | 32 | 1.259842518 | 57 | 2.244094486 | 82 | 3.228346453 |
| 8 | 0.3149606296 | 33 | 1.299212597 | 58 | 2.283464565 | 83 | 3.267716532 |
| 9 | 0.3543307083 | 34 | 1.338582676 | 59 | 2.322834643 | 84 | 3.307086611 |
| 10 | 0.393700787 | 35 | 1.377952755 | 60 | 2.362204722 | 85 | 3.34645669 |
| 11 | 0.4330708657 | 36 | 1.417322833 | 61 | 2.401574801 | 86 | 3.385826768 |
| 12 | 0.4724409444 | 37 | 1.456692912 | 62 | 2.440944879 | 87 | 3.425196847 |
| 13 | 0.5118110231 | 38 | 1.496062991 | 63 | 2.480314958 | 88 | 3.464566926 |
| 14 | 0.5511811018 | 39 | 1.535433069 | 64 | 2.519685037 | 89 | 3.503937004 |
| 15 | 0.5905511805 | 40 | 1.574803148 | 65 | 2.559055116 | 90 | 3.543307083 |
| 16 | 0.6299212592 | 41 | 1.614173227 | 66 | 2.598425194 | 91 | 3.582677162 |
| 17 | 0.6692913379 | 42 | 1.653543305 | 67 | 2.637795273 | 92 | 3.62204724 |
| 18 | 0.7086614166 | 43 | 1.692913384 | 68 | 2.677165352 | 93 | 3.661417319 |
| 19 | 0.7480314953 | 44 | 1.732283463 | 69 | 2.71653543 | 94 | 3.700787398 |
| 20 | 0.787401574 | 45 | 1.771653542 | 70 | 2.755905509 | 95 | 3.740157477 |
| 21 | 0.8267716527 | 46 | 1.81102362 | 71 | 2.795275588 | 96 | 3.779527555 |
| 22 | 0.8661417314 | 47 | 1.850393699 | 72 | 2.834645666 | 97 | 3.818897634 |
| 23 | 0.9055118101 | 48 | 1.889763778 | 73 | 2.874015745 | 98 | 3.858267713 |
| 24 | 0.9448818888 | 49 | 1.929133856 | 74 | 2.913385824 | 99 | 3.897637791 |
| 25 | 0.9842519675 | 50 | 1.968503935 | 75 | 2.952755903 | 100 | 3.93700787 |