Inches to mm ►
* The inches fraction result is rounded to the nearest 1/64 fraction.
How to convert millimeters to inches
1 millimeter is equal to 0.03937007874 inches:
1mm = (1/25.4)″ = 0.03937007874″
The distance d in inches (″) is equal to the distance d in millimeters (mm) divided by 25.4:
d(″) = d(mm) / 25.4
Example
Convert 20 mm to inches:
d(″) = 20mm / 25.4 = 0.7874″
How many inches in a millimeter
One millimeter is equal to 0.03937 inches:
1mm = 1mm / 25.4mm/in = 0.03937in
How many millimeters in an inch
One inch is equal to 25.4 millimeters:
1in = 25.4mm/in × 1in = 25.4mm
How to convert 10mm to inches
Divide 10 millimeters by 25.4 to get inches:
10mm = 10mm / 25.4mm/in = 0.3937in
Millimeters to inches conversion table
The fraction inches are rounded to 1/64 resolution.
0.01 mm | 0.0004 ″ | 0 ″ |
0.1 mm | 0.0039 ″ | 0 ″ |
1 mm | 0.0394 ″ | 3/64 ″ |
2 mm | 0.0787 ″ | 5/64 ″ |
3 mm | 0.1181 ″ | 1/8 ″ |
4 mm | 0.1575 ″ | 5/32 ″ |
5 mm | 0.1969 ″ | 13/64 ″ |
6 mm | 0.2362 ″ | 15/64 ″ |
7 mm | 0.2756 ″ | 9/32 ″ |
8 mm | 0.3150 ″ | 5/16 ″ |
9 mm | 0.3543 ″ | 23/64 ″ |
10 mm | 0.3937 ″ | 25/64 ″ |
20 mm | 0.7874 ″ | 25/32 ″ |
30 mm | 1.1811 ″ | 1 3/16 ″ |
40 mm | 1.5784 ″ | 1 37/64 ″ |
50 mm | 1.9685 ″ | 1 31/32 ″ |
60 mm | 2.3622 ″ | 2 23/64 ″ |
70 mm | 2.7559 ″ | 2 3/4 ″ |
80 mm | 3.1496 ″ | 3 5/32 ″ |
90 mm | 3.5433 ″ | 3 35/64 ″ |
100 mm | 3.9370 ″ | 3 15/16 ″ |
Inches to mm ►
See also
- Inches to mm
- cm to inches
- Inches to cm
Please provide values below to convert millimeter [mm] to inch [in], or vice versa.
Millimeter
Definition: A millimeter (symbol: mm) is a unit of length in the International System of Units (SI). It is defined in terms of the meter, as 1/1000 of a meter, or the distance traveled by light in 1/299 792 458 000 of a second.
History/origin: The milli- prefix is one of many metric prefixes. It indicates one thousandth of the base unit, in this case the meter. The definition of the meter has changed over time, the current definition being based on the distance traveled by the speed of light in a given amount of time. The relationship between the meter and the millimeter is constant however. Prior to this definition, the meter was based on the length of a prototype meter bar. In 2019, the meter has been re-defined based on the changes made to the definition of a second.
Inch
Definition: An inch (symbol: in) is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly 25.4 millimeters in 1959. There are 12 inches in a foot and 36 inches in a yard.
History/origin: The term "inch" was derived from the Latin unit "uncia" which equated to "one-twelfth" of a Roman foot.
There have been a number of different standards for the inch in the past, with the current definition being based on the international yard. One of the earliest definitions of the inch was based on barleycorns, where an inch was equal to the length of three grains of dry, round barley placed end-to-end. Another version of the inch is also believed to have been derived from the width of a human thumb, where the length was obtained from averaging the width of three thumbs: a small, a medium, and a large one.
Current use: The inch is mostly used in the United States, Canada, and the United Kingdom. It is also sometimes used in Japan (as well as other countries) in relation to electronic parts, like the size of display screens.
Millimeter to Inch Conversion Table
0.01 mm | 0.0003937008 in |
0.1 mm | 0.0039370079 in |
1 mm | 0.0393700787 in |
2 mm | 0.0787401575 in |
3 mm | 0.1181102362 in |
5 mm | 0.1968503937 in |
10 mm | 0.3937007874 in |
20 mm | 0.7874015748 in |
50 mm | 1.968503937 in |
100 mm | 3.937007874 in |
1000 mm | 39.3700787402 in |
How to Convert Millimeter to Inch
1 mm = 0.0393700787 in
1 in = 25.4 mm
Example: convert 15 mm to in:
15 mm = 15 × 0.0393700787 in = 0.5905511811 in
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MM | Approximate Size In Inches | Exact Size In Inches |
1mm | 1/25 Inch | 0.03937 Inches |
2mm | 1/16 Inch | 0.07874 Inches |
3mm | 3/32 Inch | 0.11811 Inches |
4mm | 1/8 Inch | 0.15748 Inches |