## Unit Converter

## Conversion formula

The conversion factor from inches to millimeters is 25.4, which means that 1 inch is equal to 25.4 millimeters:

1 in = 25.4 mm

To convert 12 inches into millimeters we have to multiply 12 by the conversion factor in order to get the length amount from inches to millimeters. We can also form a simple proportion to calculate the result:

1 in → 25.4 mm

12 in → L_{(mm)}

Solve the above proportion to obtain the length *L* in millimeters:

L_{(mm)} = 12 in × 25.4 mm

L_{(mm)} = 304.8 mm

The final result is:

12 in → 304.8 mm

We conclude that **12 inches is equivalent to 304.8 millimeters**:

12 inches = 304.8 millimeters

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case **1 millimeter is equal to 0.0032808398950131 × 12 inches**.

Another way is saying that *12 inches is equal to 1 ÷ 0.0032808398950131 millimeters*.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that **twelve inches is approximately three hundred four point eight millimeters**:

12 in ≅ 304.8 mm

An alternative is also that *one millimeter is approximately zero point zero zero three times twelve inches*.

## Conversion table

### inches to millimeters chart

For quick reference purposes, below is the conversion table you can use to convert from inches to millimeters

inches (in) | millimeters (mm) |
---|---|

13 inches | 330.2 millimeters |

14 inches | 355.6 millimeters |

15 inches | 381 millimeters |

16 inches | 406.4 millimeters |

17 inches | 431.8 millimeters |

18 inches | 457.2 millimeters |

19 inches | 482.6 millimeters |

20 inches | 508 millimeters |

21 inches | 533.4 millimeters |

22 inches | 558.8 millimeters |