Convert Atmosphere to Millibar
Use this free converter to change atmospheres (atm) into millibars (mbar). Atmosphere and millibar both measure pressure. As a quick reference, 1 atm equals 1013.25 mbar, and 1 mbar equals 0.00098692327 atm.
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Millibar (mbar)
1013.25
1 atm = 1013.25 mbar
Pressure conversion table
| Atmosphere | Millibar |
|---|---|
| 0.01 | 10.1325 |
| 0.1 | 101.325 |
| 0.5 | 506.625 |
| 1 | 1013.25 |
| 2 | 2026.5 |
| 3 | 3039.75 |
| 5 | 5066.25 |
| 10 | 10132.5 |
| 20 | 20265 |
| 25 | 25331.25 |
| 50 | 50662.5 |
| 100 | 101325 |
| 1,000 | 1013250 |
How to convert Atmosphere to Millibar
Multiply the atmosphere value by 1013.25 to get millibars.
- Enter the number of atmospheres you want to convert.
- The converter instantly shows the equivalent value in millibars.
- Worked example: 15 atm × 1013.25 = 15198.75 mbar.
- Use the swap button to reverse the conversion (millibar to atmosphere).
About these units
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.
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.
Frequently asked questions
How many millibars are in a atmosphere?
There are 1013.25 mbar in 1 atm. To convert, multiply the number of atmospheres by 1013.25.
How do I convert atmospheres to millibars?
Multiply the atmosphere value by 1013.25 to get millibars. For example, 10 atm = 10132.5 mbar.
Is this atmosphere-to-millibar 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 Atmosphere to other pressure units
| Unit | 1 Atmosphere equals |
|---|---|
| Pascal (Pa) | 101325 Pa |
| Kilopascal (kPa) | 101.325 kPa |
| Bar (bar) | 1.01325 bar |
| Pound per Square Inch (psi) | 14.695949 psi |
| Torr (Torr) | 760 Torr |
| Millibar (mbar) | 1013.25 mbar |