bar to atm – convert bar to atmospheres
Use this page to convert bar to atm (bar to standard atmospheres) for tyre pressures, hydraulics, weather and lab work. It links straight into the main pressure converter on conversionsofeverything.com with bar → atm pre-selected.
Open the interactive bar → atm converter:
Use main converter (bar → atm) or switch to atm → barOn the homepage you can also swap quickly between bar, atm, psi, kPa, mbar and mmHg using the dropdown menus.
Quick reference: bar to atm
The exact relationship is 1 atm = 1.01325 bar, so: atm = bar ÷ 1.01325. Some handy rounded values:
| Pressure (bar) | Pressure (atm, approx.) |
|---|---|
| 1 bar | 0.99 atm |
| 1.5 bar | 1.48 atm |
| 2 bar | 1.97 atm |
| 5 bar | 4.93 atm |
| 10 bar | 9.87 atm |
Why convert bar to atm?
Typical real-world uses include:
- Reading older scientific papers that list pressures in atm instead of bar.
- Comparing hydraulic or process plant datasheets that mix bar and atmospheres.
- Checking vacuum pump performance in atm and converting to bar.
- Relating scuba diving pressures in bar to atmospheric pressure at sea level.
How to use this bar → atm page
For a quick mental check you can use the rule of thumb 1 bar ≈ 1 atm, but for anything technical it is safer to use the precise converter:
- Click the blue button above to open the main pressure converter.
- Type your pressure in bar and the result in atm appears instantly.
- Use the swap button on the homepage if you want atm → bar instead.
- Copy or share the URL so you can return to the same conversion later.
bar to atm FAQ
Is 1 bar the same as 1 atm?
Not exactly. 1 bar is defined as 100,000 Pa, while 1 atm is defined as 101,325 Pa. They are very close, which is why older approximations treat them as “about equal”, but precision work should use the proper conversion factor.
Which unit should I use: bar or atm?
In modern engineering and industry, bar, kPa and MPa are more common than atm. Atmospheres still appear in some chemistry, physics and older reference tables. The converter makes it easy to work in whichever unit your data uses.
Can I convert bar to other pressure units here?
Yes. On the main homepage you can select bar → psi, bar → kPa, bar → mbar, bar → mmHg and many other combinations. This landing page just gives you a fast route into the bar → atm version.
Related pressure converters on this site
All pressure conversions on the homepage work by converting via pascals (Pa) as the internal base unit, so you can chain between bar, atm, psi, kPa, mbar and more with consistent results.
Last updated: 2 December 2025