Convert atmosphere (standard)s to millibars
1 atm = 1013.25 mbar — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
1013.25mbar
As a fraction: 4053/4
1 atm = 1013.25 mbar
How to convert atmosphere (standard)s to millibars
Multiply the number of atmosphere (standard)s by 1013.25 to get millibars.
The exact factor is 1013.25 — as a fraction, 4053/4.
Atmosphere (standard): Exactly 101 325 Pa by definition.
Millibar: Identical to the hectopascal used on modern weather charts.
Atmosphere (standard) to Millibar conversion table
| Atmosphere (standard)s (atm) | Millibars (mbar) |
|---|---|
| 1 atm | 1013.25 |
| 2 atm | 2026.5 |
| 3 atm | 3039.75 |
| 5 atm | 5066.25 |
| 10 atm | 10 132.5 |
| 20 atm | 20 265 |
| 25 atm | 25 331.25 |
| 50 atm | 50 662.5 |
| 100 atm | 101 325 |
| 250 atm | 253 312.5 |
| 500 atm | 506 625 |
| 1000 atm | 1 013 250 |
Millibar to Atmosphere (standard) conversion table
| Millibars (mbar) | Atmosphere (standard)s (atm) |
|---|---|
| 1 mbar | 0.000 986 923 27 |
| 2 mbar | 0.001 973 846 5 |
| 3 mbar | 0.002 960 769 8 |
| 5 mbar | 0.004 934 616 3 |
| 10 mbar | 0.009 869 232 7 |
| 20 mbar | 0.019 738 465 |
| 25 mbar | 0.024 673 082 |
| 50 mbar | 0.049 346 163 |
| 100 mbar | 0.098 692 327 |
| 250 mbar | 0.246 730 82 |
| 500 mbar | 0.493 461 63 |
| 1000 mbar | 0.986 923 27 |
Frequently asked
How many millibars are in a atmosphere (standard)?
One atmosphere (standard) equals 1013.25 millibars (atm → mbar). That figure is exact, not rounded.
How do you convert atmosphere (standard)s to millibars?
Multiply the number of atmosphere (standard)s by 1013.25 to get millibars.
What is 1 mbar in atmosphere (standard)s?
One millibar is 0.0009869232667 atmosphere (standard)s.
What is 10 atm in mbar?
10 atm = 10 132.5 mbar.
What exactly is a atmosphere (standard)?
Exactly 101 325 Pa by definition.
What exactly is a millibar?
Identical to the hectopascal used on modern weather charts.