Square Millimeter (sq mm) Converter

Square Millimeter Conversion Calculator

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

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What Is a Square Millimeter?

A square millimeter is a unit used to measure area.

The square millimeter, or square millimetre, is a multiple of the square meter, which is the SI derived unit for area. In the metric system, "milli" is the prefix for thousandths, or 10^-3. A square millimeter is sometimes also referred to as a square mm. Square millimeters can be abbreviated as sq mm, and are also sometimes abbreviated as mm². For example, 1 square millimeter can be written as 1 sq mm or 1 mm².

You can find the area of a space in square millimeters using an area calculator.

How Much Is a Square Millimeter?

One square millimeter is equivalent to the area of a square with edges that are each 1 millimeter in length. One square millimeter is equal to 0.00155 square inches or 1/100 of a square centimeter.

How to Convert Square Millimeters

To convert square millimeters to another unit of area, 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.^[1]

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

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

square millimeters × conversion factor = result

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

Square Millimeter Conversion Table

Common square millimeter values and equivalent imperial and metric area measurements
square millimeters	square miles	acres	square yards	square feet	square inches	square kilometers	square meters	square centimeters	hectares	ares
1 sq mm	0.0000000000003861 sq mi	0.00000000024711 ac	0.000001196 sq yd	0.000010764 sq ft	0.00155 sq in	0.000000000001 sq km	0.000001 sq m	0.01 sq cm	0.0000000001 ha	0.00000001 a
2 sq mm	0.0000000000007722 sq mi	0.00000000049421 ac	0.000002392 sq yd	0.000021528 sq ft	0.0031 sq in	0.000000000002 sq km	0.000002 sq m	0.02 sq cm	0.0000000002 ha	0.00000002 a
3 sq mm	0.0000000000011583 sq mi	0.00000000074132 ac	0.000003588 sq yd	0.000032292 sq ft	0.00465 sq in	0.000000000003 sq km	0.000003 sq m	0.03 sq cm	0.0000000003 ha	0.00000003 a
4 sq mm	0.0000000000015444 sq mi	0.00000000098842 ac	0.000004784 sq yd	0.000043056 sq ft	0.0062 sq in	0.000000000004 sq km	0.000004 sq m	0.04 sq cm	0.0000000004 ha	0.00000004 a
5 sq mm	0.0000000000019305 sq mi	0.0000000012355 ac	0.00000598 sq yd	0.00005382 sq ft	0.00775 sq in	0.000000000005 sq km	0.000005 sq m	0.05 sq cm	0.0000000005 ha	0.00000005 a
6 sq mm	0.0000000000023166 sq mi	0.0000000014826 ac	0.0000071759 sq yd	0.000064583 sq ft	0.0093 sq in	0.000000000006 sq km	0.000006 sq m	0.06 sq cm	0.0000000006 ha	0.00000006 a
7 sq mm	0.0000000000027027 sq mi	0.0000000017297 ac	0.0000083719 sq yd	0.000075347 sq ft	0.01085 sq in	0.000000000007 sq km	0.000007 sq m	0.07 sq cm	0.0000000007 ha	0.00000007 a
8 sq mm	0.0000000000030888 sq mi	0.0000000019768 ac	0.0000095679 sq yd	0.000086111 sq ft	0.0124 sq in	0.000000000008 sq km	0.000008 sq m	0.08 sq cm	0.0000000008 ha	0.00000008 a
9 sq mm	0.0000000000034749 sq mi	0.0000000022239 ac	0.000010764 sq yd	0.000096875 sq ft	0.01395 sq in	0.000000000009 sq km	0.000009 sq m	0.09 sq cm	0.0000000009 ha	0.00000009 a
10 sq mm	0.000000000003861 sq mi	0.0000000024711 ac	0.00001196 sq yd	0.000108 sq ft	0.0155 sq in	0.00000000001 sq km	0.00001 sq m	0.1 sq cm	0.000000001 ha	0.0000001 a
11 sq mm	0.0000000000042471 sq mi	0.0000000027182 ac	0.000013156 sq yd	0.000118 sq ft	0.01705 sq in	0.000000000011 sq km	0.000011 sq m	0.11 sq cm	0.0000000011 ha	0.00000011 a
12 sq mm	0.0000000000046332 sq mi	0.0000000029653 ac	0.000014352 sq yd	0.000129 sq ft	0.0186 sq in	0.000000000012 sq km	0.000012 sq m	0.12 sq cm	0.0000000012 ha	0.00000012 a
13 sq mm	0.0000000000050193 sq mi	0.0000000032124 ac	0.000015548 sq yd	0.00014 sq ft	0.02015 sq in	0.000000000013 sq km	0.000013 sq m	0.13 sq cm	0.0000000013 ha	0.00000013 a
14 sq mm	0.0000000000054054 sq mi	0.0000000034595 ac	0.000016744 sq yd	0.000151 sq ft	0.0217 sq in	0.000000000014 sq km	0.000014 sq m	0.14 sq cm	0.0000000014 ha	0.00000014 a
15 sq mm	0.0000000000057915 sq mi	0.0000000037066 ac	0.00001794 sq yd	0.000161 sq ft	0.02325 sq in	0.000000000015 sq km	0.000015 sq m	0.15 sq cm	0.0000000015 ha	0.00000015 a
16 sq mm	0.0000000000061776 sq mi	0.0000000039537 ac	0.000019136 sq yd	0.000172 sq ft	0.0248 sq in	0.000000000016 sq km	0.000016 sq m	0.16 sq cm	0.0000000016 ha	0.00000016 a
17 sq mm	0.0000000000065637 sq mi	0.0000000042008 ac	0.000020332 sq yd	0.000183 sq ft	0.02635 sq in	0.000000000017 sq km	0.000017 sq m	0.17 sq cm	0.0000000017 ha	0.00000017 a
18 sq mm	0.0000000000069498 sq mi	0.0000000044479 ac	0.000021528 sq yd	0.000194 sq ft	0.0279 sq in	0.000000000018 sq km	0.000018 sq m	0.18 sq cm	0.0000000018 ha	0.00000018 a
19 sq mm	0.0000000000073359 sq mi	0.000000004695 ac	0.000022724 sq yd	0.000205 sq ft	0.02945 sq in	0.000000000019 sq km	0.000019 sq m	0.19 sq cm	0.0000000019 ha	0.00000019 a
20 sq mm	0.000000000007722 sq mi	0.0000000049421 ac	0.00002392 sq yd	0.000215 sq ft	0.031 sq in	0.00000000002 sq km	0.00002 sq m	0.2 sq cm	0.000000002 ha	0.0000002 a