Atmospheres to Millibars Converter

Enter the pressure in atmospheres below to convert it to millibars.

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Result in Millibars:

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1 atm = 1,013.25 mbar

Do you want to convert millibars to atmospheres?

How to Convert Atmospheres to Millibars

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To convert a measurement in atmospheres to a measurement in millibars, multiply the pressure by the following conversion ratio: 1,013.25 millibars/atmosphere.

Since one atmosphere is equal to 1,013.25 millibars, you can use this simple formula to convert:

millibars = atmospheres × 1,013.25

The pressure in millibars is equal to the pressure in atmospheres multiplied by 1,013.25.

For example, here's how to convert 5 atmospheres to millibars using the formula above.
millibars = (5 atm × 1,013.25) = 5,066.25 mbar

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

What Is an Atmosphere?

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.

Learn more about atmospheres.

What Is a Millibar?

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 thousandths, or 10-3. Millibars can be abbreviated as mbar; for example, 1 millibar can be written as 1 mbar.

Learn more about millibars.

Atmosphere to Millibar Conversion Table

Table showing various atmosphere measurements converted to millibars.
Atmospheres Millibars
0.001 atm 1.0133 mbar
0.002 atm 2.0265 mbar
0.003 atm 3.0398 mbar
0.004 atm 4.053 mbar
0.005 atm 5.0663 mbar
0.006 atm 6.0795 mbar
0.007 atm 7.0928 mbar
0.008 atm 8.106 mbar
0.009 atm 9.1193 mbar
0.01 atm 10.13 mbar
0.02 atm 20.27 mbar
0.03 atm 30.4 mbar
0.04 atm 40.53 mbar
0.05 atm 50.66 mbar
0.06 atm 60.8 mbar
0.07 atm 70.93 mbar
0.08 atm 81.06 mbar
0.09 atm 91.19 mbar
0.1 atm 101.33 mbar
0.2 atm 202.65 mbar
0.3 atm 303.98 mbar
0.4 atm 405.3 mbar
0.5 atm 506.63 mbar
0.6 atm 607.95 mbar
0.7 atm 709.28 mbar
0.8 atm 810.6 mbar
0.9 atm 911.93 mbar
1 atm 1,013 mbar

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