# Square Millimeters to Square Inches Conversion

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

**Results in Square Inches:**

## How to Convert Square Millimeters to Square Inches

To convert a square millimeter measurement to a square inch measurement, multiply the area by the conversion ratio.

Since one square millimeter is equal to 0.00155 square inches, you can use this simple formula to convert:

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

**For example,**here's how to convert 500 square millimeters to square inches using the formula above.

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 to Square Inch Conversion Table

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 |

20 sq mm | 0.031 sq in |

30 sq mm | 0.0465 sq in |

40 sq mm | 0.062 sq in |

50 sq mm | 0.0775 sq in |

60 sq mm | 0.093 sq in |

70 sq mm | 0.1085 sq in |

80 sq mm | 0.124 sq in |

90 sq mm | 0.1395 sq in |

100 sq mm | 0.155 sq in |

200 sq mm | 0.310001 sq in |

300 sq mm | 0.465001 sq in |

400 sq mm | 0.620001 sq in |

500 sq mm | 0.775002 sq in |

600 sq mm | 0.930002 sq in |

700 sq mm | 1.085 sq in |

800 sq mm | 1.24 sq in |

900 sq mm | 1.395 sq in |

1,000 sq mm | 1.55 sq in |