Convert Square Millimeters to Square Inches

Enter the area in square millimeters below to get the value converted to square inches.

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Results in Square Inches:
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1 sq mm = 0.00155 sq in

How to Convert Square Millimeters to Square Inches

Calculators can be used to convert measurements from one unit to another

To convert a square millimeter measurement to a square inch measurement, multiply the area by the conversion ratio. One square millimeter is equal to 0.00155 square inches, so use this simple formula to convert:

square inches = square millimeters × 0.00155

The area in square inches is equal to the square millimeters multiplied by 0.00155.

For example, here's how to convert 5 square millimeters to square inches using the formula above.
5 sq mm = (5 × 0.00155) = 0.00775 sq in

Square millimeters and square inches are both units used to measure area. Keep reading to learn more about each unit of measure.

Square Millimeters

One square millimeter is equal to the area of a square with edges that are 1 millimeter in length.

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 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.

Square Inches

One square inch is equal to the area of a square with sides that are 1 inch in length.

The square inch is a US customary and imperial unit of area. A square inch is sometimes also referred to as a square in. Square inches can be abbreviated as sq in, and are also sometimes abbreviated as in². For example, 1 square inch can be written as 1 sq in or 1 in².

Square Millimeter Measurements and Equivalent Square Inch Conversions

Common square millimeter values converted to the equivalent square inch value
Square Millimeters Square Inches
1 sq mm 0.00155 sq in
2 sq mm 0.0031 sq in
3 sq mm 0.00465 sq in
4 sq mm 0.0062 sq in
5 sq mm 0.00775 sq in
6 sq mm 0.0093 sq in
7 sq mm 0.01085 sq in
8 sq mm 0.0124 sq in
9 sq mm 0.01395 sq in
10 sq mm 0.0155 sq in
11 sq mm 0.01705 sq in
12 sq mm 0.0186 sq in
13 sq mm 0.02015 sq in
14 sq mm 0.0217 sq in
15 sq mm 0.02325 sq in
16 sq mm 0.0248 sq in
17 sq mm 0.02635 sq in
18 sq mm 0.0279 sq in
19 sq mm 0.02945 sq in
20 sq mm 0.031 sq in
21 sq mm 0.03255 sq in
22 sq mm 0.0341 sq in
23 sq mm 0.03565 sq in
24 sq mm 0.0372 sq in
25 sq mm 0.03875 sq in
26 sq mm 0.0403 sq in
27 sq mm 0.04185 sq in
28 sq mm 0.0434 sq in
29 sq mm 0.04495 sq in
30 sq mm 0.0465 sq in
31 sq mm 0.04805 sq in
32 sq mm 0.0496 sq in
33 sq mm 0.05115 sq in
34 sq mm 0.0527 sq in
35 sq mm 0.05425 sq in
36 sq mm 0.0558 sq in
37 sq mm 0.05735 sq in
38 sq mm 0.0589 sq in
39 sq mm 0.06045 sq in
40 sq mm 0.062 sq in

More Square Millimeter Area Conversions

US Customary
Convert to Square Miles
1 sq mm is equal to 3.861E-13 square miles
Convert to Acres
1 sq mm is equal to 2.4711E-10 acres
Convert to Square Yards
1 sq mm is equal to 1.196E-6 square yards
Convert to Square Feet
1 sq mm is equal to 1.0764E-5 square feet
SI Units
Convert to Square Kilometers
1 sq mm is equal to 1.0E-12 square kilometers
Convert to Square Meters
1 sq mm is equal to 1.0E-6 square meters
Convert to Square Centimeters
1 sq mm is equal to 0.01 square centimeters
Other Metric Units
Convert to Hectares
1 sq mm is equal to 1.0E-10 hectares
Convert to Ares
1 sq mm is equal to 1.0E-8 ares