Millimeter (mm) Conversion Calculator

Millimeter Conversion Calculator

Enter a value in millimeters below to convert to another unit of length.

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What Is a Millimeter?

A millimeter is a unit used to measure length.

The millimeter, or millimetre, is a multiple of the meter, which is the SI base unit for length. In the metric system, "milli" is the prefix for thousandths, or 10^-3. Millimeters can be abbreviated as mm; for example, 1 millimeter can be written as 1 mm.

Millimeters are often represented by the smallest ticks on most metric rulers. To get a reference point of the size, the thickness of a US dime is 1.35mm.^[1]

How Long Is a Millimeter?

One millimeter is equal to one-thousandth (1/1,000) of a meter, which is defined as the distance light travels in a vacuum in ¹/_299,792,458 of a second. One millimeter is equal to 0.0393701 inches.

How to Convert Millimeters

To convert millimeters to another unit of length, you need to multiply the value by a conversion factor. A conversion factor is a numerical value used to change the units of a measurement without changing the value.^[2]

You can find the conversion factors for millimeters in the conversion table below.

Then, multiply the length measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

millimeters × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

Millimeter Conversion Table

Common millimeter values and equivalent imperial and metric length measurements
millimeters	miles	yards	feet	inches	kilometers	meters	centimeters	micrometers	nanometers
1 mm	0.00000062137 mi	0.001094 yd	0.003281'	0.03937"	0.000001 km	0.001 m	0.1 cm	1,000 µm	1,000,000 nm
2 mm	0.0000012427 mi	0.002187 yd	0.006562'	0.07874"	0.000002 km	0.002 m	0.2 cm	2,000 µm	2,000,000 nm
3 mm	0.0000018641 mi	0.003281 yd	0.009843'	0.11811"	0.000003 km	0.003 m	0.3 cm	3,000 µm	3,000,000 nm
4 mm	0.0000024855 mi	0.004374 yd	0.013123'	0.15748"	0.000004 km	0.004 m	0.4 cm	4,000 µm	4,000,000 nm
5 mm	0.0000031069 mi	0.005468 yd	0.016404'	0.19685"	0.000005 km	0.005 m	0.5 cm	5,000 µm	5,000,000 nm
6 mm	0.0000037282 mi	0.006562 yd	0.019685'	0.23622"	0.000006 km	0.006 m	0.6 cm	6,000 µm	6,000,000 nm
7 mm	0.0000043496 mi	0.007655 yd	0.022966'	0.275591"	0.000007 km	0.007 m	0.7 cm	7,000 µm	7,000,000 nm
8 mm	0.000004971 mi	0.008749 yd	0.026247'	0.314961"	0.000008 km	0.008 m	0.8 cm	8,000 µm	8,000,000 nm
9 mm	0.0000055923 mi	0.009843 yd	0.029528'	0.354331"	0.000009 km	0.009 m	0.9 cm	9,000 µm	9,000,000 nm
10 mm	0.0000062137 mi	0.010936 yd	0.032808'	0.393701"	0.00001 km	0.01 m	1 cm	10,000 µm	10,000,000 nm
11 mm	0.0000068351 mi	0.01203 yd	0.036089'	0.433071"	0.000011 km	0.011 m	1.1 cm	11,000 µm	11,000,000 nm
12 mm	0.0000074565 mi	0.013123 yd	0.03937'	0.472441"	0.000012 km	0.012 m	1.2 cm	12,000 µm	12,000,000 nm
13 mm	0.0000080778 mi	0.014217 yd	0.042651'	0.511811"	0.000013 km	0.013 m	1.3 cm	13,000 µm	13,000,000 nm
14 mm	0.0000086992 mi	0.015311 yd	0.045932'	0.551181"	0.000014 km	0.014 m	1.4 cm	14,000 µm	14,000,000 nm
15 mm	0.0000093206 mi	0.016404 yd	0.049213'	0.590551"	0.000015 km	0.015 m	1.5 cm	15,000 µm	15,000,000 nm
16 mm	0.0000099419 mi	0.017498 yd	0.052493'	0.629921"	0.000016 km	0.016 m	1.6 cm	16,000 µm	16,000,000 nm
17 mm	0.000010563 mi	0.018591 yd	0.055774'	0.669291"	0.000017 km	0.017 m	1.7 cm	17,000 µm	17,000,000 nm
18 mm	0.000011185 mi	0.019685 yd	0.059055'	0.708661"	0.000018 km	0.018 m	1.8 cm	18,000 µm	18,000,000 nm
19 mm	0.000011806 mi	0.020779 yd	0.062336'	0.748031"	0.000019 km	0.019 m	1.9 cm	19,000 µm	19,000,000 nm
20 mm	0.000012427 mi	0.021872 yd	0.065617'	0.787402"	0.00002 km	0.02 m	2 cm	20,000 µm	20,000,000 nm