# Square Millimeters to Square Inches Converter

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

**Results in Square Inches:**

Do you want to convert square inches to square millimeters?

## How to Convert Square Millimeters to Square Inches

To convert a measurement in square millimeters to a measurement in square inches, multiply the area by the following conversion ratio: 0.00155 square inches/square millimeter.

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

square inches = square millimeters × 0.00155

The area in square inches is equal to the area in 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.

## What 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.

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.

Learn more about square millimeters.

## What Is a Square Inch?

One square inch is equivalent to the area of a square with sides that are each 1 inch in length. One square inch is equal to 1/144 of a square foot or 1/1,296 of a square yard.

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.

Learn more about square inches.

## 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 |

## More Square Millimeter & Square Inch Conversions

- square millimeters to square miles
- square millimeters to acres
- square millimeters to square yards
- square millimeters to square feet
- square millimeters to square kilometers
- square millimeters to square meters
- square millimeters to square centimeters
- square millimeters to hectares
- square millimeters to ares
- square miles to square inches
- acres to square inches
- square yards to square inches
- square feet to square inches
- square kilometers to square inches
- square meters to square inches
- square centimeters to square inches
- hectares to square inches
- ares to square inches