To convert **mm to in** enter the value in the field below and select the target unit, the value will be displayed below:

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Metric | |
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Kilometer (km) | ^{} |

Meter (m) | ^{} |

Decimeter (dm) | ^{} |

Centimeter (cm) | ^{} |

Millimeter (mm) | ^{} |

Micrometer (µm) | ^{} |

Nanometer (nm) | ^{} |

Angstrom (Å) | ^{} |

Astronomical | |
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Parsec (pc) | ^{} |

Light-year | ^{} |

Astronomical unit (AU) | ^{} |

Light-minute | ^{} |

Light-second | ^{} |

British/American | |
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League | ^{} |

Mile (mi) | ^{} |

Furlong | ^{} |

Chain | ^{} |

Rod (rd) | ^{} |

Yard (yd) | ^{} |

Foot (ft) | ^{} |

Link | ^{} |

Hand | ^{} |

Inch (in) | ^{} |

Line | ^{} |

Thousandth (mil) | ^{} |

Thou (thou) | ^{} |

Nautical | |
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Nautical mile | ^{} |

Fathom | ^{} |

The formulas for conversion are represented below:

in = mm / 25.4

Example: 30 Millimeters in Inches:

in = mm / 25.4

in = 30 / 25.4

in = 1.1811

mm = in * 25.4

Example: 1.5 Inches in Millimeters:

mm = in * 25.4

mm = 1.5 * 25.4

mm = 38.1

Considering that 1 Millimeter equals 0.03937 Inches, you can use a rule of three to get that **100 Millimeters equal 3.94 Inches**.

1 mm - 0.03937 in

100 mm - x

Apply the rule of three and get:

x ~~mm~~ = 3.94 in~~mm~~

x = 3.94 inches

If every 1 Inch we have 25.4 Millimeters, just multiply the number of Inches (100) by 25.4, so you will get that **100 in is equivalent to 2540 mm**. Observe the calculation below:

mm = in * 25.4

mm = 100 * 25.4

mm = 2540