# Mils (NATO) Conversion Calculator

Enter a value in mils below to convert to another unit of angle.

**Results:**

## What Is a Mil?

A mil is a unit used to measure angle.

A mil is sometimes also referred to as an angular mil. Mils can be abbreviated as *mil*; for example, 1 mil can be written as 1 mil.

## How Much Is a Mil?

A mil, short for milliradian, is equal to 1/6,400 of a circle. The mil used by the US military and NATO forces is slightly different than the true value of a milliradian, which is equal to 1/6,283 of a circle.

During World War I the US adopted what is now the NATO mil to replace degrees and minutes for use in artillery sights. They opted to round mils to 6,400 per circle for simplicity at the time. Today, the mil is commonly used to measure adjustment of sights and scopes of firearms.

There is rightfully much confusion as a result of the mil adopted by the US military and NATO being slightly different than the milliradian.

## How to Convert Mils

To convert mils to another unit of angle, you need to multiply the value by a conversion factor.
A conversion factor is a numerical value used to change the units of a measurement without changing the value.^{[1]}

You can find the conversion factors for mils in the conversion table below.

Then, multiply the angle measurement by the conversion factor to find the equivalent value in the desired unit of measurement.

mils × conversion factor = result

You can also use a calculator, such as one of the converters below, for the conversion.

## Mil Conversion Table

mils | radians | milliradians | degrees | minutes of arc | seconds of arc | gradians | revolutions | circles |
---|---|---|---|---|---|---|---|---|

1 mil | 0.000982 rad | 0.981748 mrad | 0.05625° | 3.375' | 202.5" | 0.0625^{g} |
0.000156 r | 0.000156 cir |

2 mil | 0.001963 rad | 1.963495 mrad | 0.1125° | 6.75' | 405" | 0.125^{g} |
0.000313 r | 0.000313 cir |

3 mil | 0.002945 rad | 2.945243 mrad | 0.16875° | 10.125' | 607.5" | 0.1875^{g} |
0.000469 r | 0.000469 cir |

4 mil | 0.003927 rad | 3.926991 mrad | 0.225° | 13.5' | 810" | 0.25^{g} |
0.000625 r | 0.000625 cir |

5 mil | 0.004909 rad | 4.908739 mrad | 0.28125° | 16.875' | 1,013" | 0.3125^{g} |
0.000781 r | 0.000781 cir |

6 mil | 0.00589 rad | 5.890486 mrad | 0.3375° | 20.25' | 1,215" | 0.375^{g} |
0.000938 r | 0.000938 cir |

7 mil | 0.006872 rad | 6.872234 mrad | 0.39375° | 23.625' | 1,418" | 0.4375^{g} |
0.001094 r | 0.001094 cir |

8 mil | 0.007854 rad | 7.853982 mrad | 0.45° | 27' | 1,620" | 0.5^{g} |
0.00125 r | 0.00125 cir |

9 mil | 0.008836 rad | 8.835729 mrad | 0.50625° | 30.375' | 1,823" | 0.5625^{g} |
0.001406 r | 0.001406 cir |

10 mil | 0.009817 rad | 9.817477 mrad | 0.5625° | 33.75' | 2,025" | 0.625^{g} |
0.001563 r | 0.001563 cir |

11 mil | 0.010799 rad | 10.799225 mrad | 0.61875° | 37.125' | 2,228" | 0.6875^{g} |
0.001719 r | 0.001719 cir |

12 mil | 0.011781 rad | 11.780972 mrad | 0.675° | 40.5' | 2,430" | 0.75^{g} |
0.001875 r | 0.001875 cir |

13 mil | 0.012763 rad | 12.76272 mrad | 0.73125° | 43.875' | 2,633" | 0.8125^{g} |
0.002031 r | 0.002031 cir |

14 mil | 0.013744 rad | 13.744468 mrad | 0.7875° | 47.25' | 2,835" | 0.875^{g} |
0.002188 r | 0.002188 cir |

15 mil | 0.014726 rad | 14.726216 mrad | 0.84375° | 50.625' | 3,038" | 0.9375^{g} |
0.002344 r | 0.002344 cir |

16 mil | 0.015708 rad | 15.707963 mrad | 0.9° | 54' | 3,240" | 1^{g} |
0.0025 r | 0.0025 cir |

17 mil | 0.01669 rad | 16.689711 mrad | 0.95625° | 57.375' | 3,443" | 1.0625^{g} |
0.002656 r | 0.002656 cir |

18 mil | 0.017671 rad | 17.671459 mrad | 1.0125° | 60.75' | 3,645" | 1.125^{g} |
0.002813 r | 0.002813 cir |

19 mil | 0.018653 rad | 18.653206 mrad | 1.06875° | 64.125' | 3,848" | 1.1875^{g} |
0.002969 r | 0.002969 cir |

20 mil | 0.019635 rad | 19.634954 mrad | 1.125° | 67.5' | 4,050" | 1.25^{g} |
0.003125 r | 0.003125 cir |

## Mil Conversion Calculators

You can also convert angle using one of our mil converters below.

## References

- National Institute of Standards & Technology, Unit Conversion, https://www.nist.gov/pml/owm/metric-si/unit-conversion