# Convert Square Millimeters to Square Inches

Enter your square millimeter value in the form below to get the value calculated in square inches.

**Results in Square Inches:**

## How to Convert Square Millimeters to Square Inches

Convert square millimeters to square inches with this simple formula:

Converting a square millimeter area measurement to a square inch measurement involves multiplying the area by the conversion ratio to find the result. One square millimeter is equal to 0.00155 square inches, so to convert simply multiply by 0.00155.

**For example:**

Learn more about finding the area of your space using our area calculator.

Square millimeters and square inches are both units used to measure area.
Learn more about area and
find more area measurement conversion calculators.
Square millimeters are a metric measurement and can be abbreviated as *sq mm*, for example 1 sq mm.
Square inches are an imperial measurement and can be abbreviated as *sq in*, for example 1 sq in.
Learn more about the metric system, including the common unit prefixes and how to convert between metric units.

## Square Millimeter Measurements and Equivalent Square Inch Conversions

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

**Are 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