In 1 bars there are 0.986923 atmospheres. Meanwhile in 1 atmospheres there are 1.01325 bars. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Atmospheres to Bars calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert bar to atmospheres (atm), use a fixed pressure ratio based on pascals.
atm = bar × (100,000 ÷ 101,325)
So, 1 bar ≈ 0.986923 atm
Tip: For a fast estimate, multiply bar by 0.987 to get atm.
1 bar equals about 0.986923 atm.
To convert bar to atm, multiply the bar value by 0.986923.
Use this formula: atm = bar × 0.986923.
Example: 5 bar × 0.986923 = 4.934615 atm.
There are about 0.986923 atmospheres in 1 bar.
There are about 1.01325 bar in 1 atm.
To convert atm to bar, multiply by 1.01325.
They’re based on different reference pressures.
Yes, bar and atm both measure absolute pressure by default.
If you see barg (bar gauge), it means pressure relative to the air around you, not absolute.
They all measure pressure, just in different sizes.
For quick estimates, treat 1 bar as about 1 atm.
For better accuracy, subtract about 1.3% from the bar value.
Example: 10 bar is close to 9.87 atm.
Here are a few quick conversions (rounded):
You may need bar to atm conversion when comparing pressure specs across tools and fields, such as:
No. The conversion factor stays the same because it’s a unit change.
Temperature matters when pressure changes in a closed space, but it doesn’t change how bar converts to atm.
It depends on your use.
An atmosphere (atm) is a unit of pressure.
“Atmospheric pressure” is the air pressure around you, which changes with weather and altitude. At sea level, it’s close to 1 atm, but not always exactly.
The Calculate Box tool to convert bars to atmospheres uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a bars value in the box and have it instantly converted to atmospheres.