Convert Millibar to Atmosphere
Enter the number of millibars that you want to convert to atmospheres.
How to Convert Millibars to Atmospheres
The millibar and atmosphere are both units of pressure. 1 atmosphere equals 1013.25 millibars. This means to convert millibars to atmospheres, you divide by 1013.25.
Formula
Step-by-Step Example
Convert 5 mbar to atmospheres:
We need to convert millibars to atmospheres
Since 1 atm = 1013.25 mbar, divide by 1013.25
5 ÷ 1013.25 = 0.0049346163
5 mbar = 0.0049346163 atm
Millibar to Atmosphere Conversion Table
Quick reference table for common millibar to atmosphere conversions. Click any value for detailed calculation.
| Millibars (mbar) | Atmospheres (atm) |
|---|---|
| 0.1 mbar | 9.8692326672e-5 atm |
| 0.5 mbar | 0.0004934616 atm |
| 1 mbar | 0.0009869233 atm |
| 2 mbar | 0.0019738465 atm |
| 5 mbar | 0.0049346163 atm |
| 10 mbar | 0.0098692327 atm |
| 25 mbar | 0.0246730817 atm |
| 50 mbar | 0.0493461633 atm |
| 100 mbar | 0.0986923267 atm |
About These Units
Millibar (mbar)
A millibar (mbar) equals 100 Pascals or one hectopascal. Millibars are used in meteorology for atmospheric pressure and weather forecasting. Standard sea level pressure is 1013.25 mbar. Hurricanes have central pressures below 950 mbar.
Atmosphere (atm)
One standard atmosphere (atm) equals 101,325 Pascals, 1.01325 bar, or 14.696 PSI—the average air pressure at sea level. Atmospheres measure diving depth (every 10 meters adds ~1 atm), altitude effects, and chemical reactions. Used as a reference pressure in science.
Frequently Asked Questions
How do I convert millibars to atmospheres?
To convert millibars to atmospheres, divide the value by 1013.25. For example, 10 mbar = 0.0098692327 atm.
How many atmospheres are in 1 millibar?
1 millibar equals 0.0009869233 atmospheres.
What is the formula for millibars to atmospheres?
The formula is: atm = mbar ÷ 1013.25.