Atmospheres to bar – convert atm to bar
Convert atmospheres to bar (atm to bar) for scuba diving depths, laboratory work, weather data and engineering calculations. This page links to the main pressure converter with atm → bar pre-selected.
Open the interactive atm → bar converter:
Use main converter (atm → bar) or switch to bar → atmThe homepage pressure tab also supports conversions between bar, psi, kPa, mmHg, mbar and Pa using the same calculation engine.
Quick reference: atm to bar
The converter uses the exact factor 1 atm = 1.01325 bar. Rounded examples:
| Atmospheres (atm) | Bar (approx.) |
|---|---|
| 0.5 atm | 0.51 bar |
| 1 atm | 1.01 bar |
| 1.5 atm | 1.52 bar |
| 2 atm | 2.03 bar |
| 3 atm | 3.04 bar |
| 5 atm | 5.07 bar |
Why convert atmospheres to bar?
Common situations where atm to bar is useful:
- Scuba diving, where dive tables and computers may use both units.
- Laboratory and chemistry work that specifies standard atmospheres.
- Engineering specifications that quote safety limits in bar.
- Weather observations and barometric pressure shown in different units.
More pressure converters on this site
Internally the converter uses pascal (Pa) as its base pressure unit, then converts out to atm, bar, psi, kPa and others to keep everything consistent.