Convert Millibar to Atmosphere
Use this free converter to change millibars (mbar) into atmospheres (atm). Millibar and atmosphere both measure pressure. As a quick reference, 1 mbar equals 0.00098692327 atm, and 1 atm equals 1013.25 mbar.
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Atmosphere (atm)
0.00098692327
1 mbar = 0.00098692327 atm
Pressure conversion table
| Millibar | Atmosphere |
|---|---|
| 0.01 | 0.0000098692327 |
| 0.1 | 0.000098692327 |
| 0.5 | 0.00049346163 |
| 1 | 0.00098692327 |
| 2 | 0.0019738465 |
| 3 | 0.0029607698 |
| 5 | 0.0049346163 |
| 10 | 0.0098692327 |
| 20 | 0.019738465 |
| 25 | 0.024673082 |
| 50 | 0.049346163 |
| 100 | 0.098692327 |
| 1,000 | 0.98692327 |
How to convert Millibar to Atmosphere
Multiply the millibar value by 0.00098692327 to get atmospheres.
- Enter the number of millibars you want to convert.
- The converter instantly shows the equivalent value in atmospheres.
- Worked example: 15 mbar × 0.00098692327 = 0.014803849 atm.
- Use the swap button to reverse the conversion (atmosphere to millibar).
About these units
Millibar (mbar)
- Definition
- A millibar (mbar) is one thousandth of a bar, equal to 100 pascals (one hectopascal).
- History
- It became the traditional unit of meteorological pressure in the 20th century.
- Current use
- Millibars (or equivalent hectopascals) report atmospheric pressure on weather charts.
Atmosphere (atm)
- Definition
- A standard atmosphere (atm) is defined as exactly 101,325 pascals, roughly average sea-level pressure.
- History
- It was standardised as a reference pressure for scientific work.
- Current use
- Atmospheres are used in chemistry, physics, and diving as a reference pressure.
Frequently asked questions
How many atmospheres are in a millibar?
There are 0.00098692327 atm in 1 mbar. To convert, multiply the number of millibars by 0.00098692327.
How do I convert millibars to atmospheres?
Multiply the millibar value by 0.00098692327 to get atmospheres. For example, 10 mbar = 0.0098692327 atm.
Is this millibar-to-atmosphere converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Millibar to other pressure units
| Unit | 1 Millibar equals |
|---|---|
| Pascal (Pa) | 100 Pa |
| Kilopascal (kPa) | 0.1 kPa |
| Bar (bar) | 0.001 bar |
| Pound per Square Inch (psi) | 0.014503774 psi |
| Atmosphere (atm) | 0.00098692327 atm |
| Torr (Torr) | 0.75006169 Torr |