# Millibars to Atmospheres Conversion

Enter the pressure in millibars below to get the value converted to atmospheres.

**Results in Atmospheres:**

## How to Convert Millibars to Atmospheres

To convert a millibar measurement to an atmosphere measurement, multiply the pressure by the conversion ratio. One millibar is equal to 0.000987 atmospheres, so use this simple formula to convert:

The pressure in atmospheres is equal to the millibars multiplied by 0.000987.

**For example,**here's how to convert 5,000 millibars to atmospheres using the formula above.

Millibars and atmospheres are both units used to measure pressure. Keep reading to learn more about each unit of measure.

## Millibars

One millibar is equal to one-thousandth of a bar, which is defined as the pressure of one newton per square meter. One millibar is also equal to one hectopascal.

The millibar is a non-SI metric unit for pressure. In the metric system, "milli" is the prefix for 10^{-3}. Millibars can be abbreviated as *mbar*; for example, 1 millibar can be written as 1 mbar.

## Atmospheres

The atmosphere is a reference measure of pressure equal to 101,325 pascals or 1,013,250 dynes. The atmosphere was originally defined as the pressure of 760 millimeters of mercury at standard gravity at 0 °C, but was later redefined in 1954 to be equal to 1,013,250 dynes.

Atmospheres can be abbreviated as *atm*; for example, 1 atmosphere can be written as 1 atm.

## Millibar to Atmosphere Conversion Table

Millibars | Atmospheres |
---|---|

1 mbar | 0.000987 atm |

2 mbar | 0.001974 atm |

3 mbar | 0.002961 atm |

4 mbar | 0.003948 atm |

5 mbar | 0.004935 atm |

6 mbar | 0.005922 atm |

7 mbar | 0.006908 atm |

8 mbar | 0.007895 atm |

9 mbar | 0.008882 atm |

10 mbar | 0.009869 atm |

20 mbar | 0.019738 atm |

30 mbar | 0.029608 atm |

40 mbar | 0.039477 atm |

50 mbar | 0.049346 atm |

60 mbar | 0.059215 atm |

70 mbar | 0.069085 atm |

80 mbar | 0.078954 atm |

90 mbar | 0.088823 atm |

100 mbar | 0.098692 atm |

200 mbar | 0.197385 atm |

300 mbar | 0.296077 atm |

400 mbar | 0.394769 atm |

500 mbar | 0.493462 atm |

600 mbar | 0.592154 atm |

700 mbar | 0.690846 atm |

800 mbar | 0.789539 atm |

900 mbar | 0.888231 atm |

1,000 mbar | 0.986923 atm |

2,000 mbar | 1.9738 atm |

3,000 mbar | 2.9608 atm |

4,000 mbar | 3.9477 atm |

5,000 mbar | 4.9346 atm |

6,000 mbar | 5.9215 atm |

7,000 mbar | 6.9085 atm |

8,000 mbar | 7.8954 atm |

9,000 mbar | 8.8823 atm |

10,000 mbar | 9.8692 atm |