Bars to Atmospheres Converter
Enter the pressure in bars below to convert it to atmospheres.
Convert Bars to Atmospheres
Enter a value in bars (bar) to convert to atmospheres (atm).
Bar to Standard Atmosphere Conversion Table
Table showing various bar measurements converted to atmospheres. Click any preset value or arrow to load it into the converter.
| Bars (bar) | Atmospheres (atm) |
|---|---|
| 1 bar | 0.9869233 atm |
| 2 bar | 1.9738465 atm |
| 5 bar | 4.9346163 atm |
| 10 bar | 9.8692327 atm |
| 15 bar | 14.803849 atm |
| 20 bar | 19.7384653 atm |
| 25 bar | 24.6730817 atm |
| 30 bar | 29.607698 atm |
| 50 bar | 49.3461633 atm |
| 75 bar | 74.019245 atm |
How to Convert Bars to Atmospheres
To convert bars to atmospheres, multiply the pressure by the following conversion ratio: 0.9869233 atmospheres/bar.
Since one bar is equal to 0.9869233 atmospheres, you can use this simple formula to convert:
The pressure in atmospheres is equal to the pressure in bars multiplied by 0.9869233.
For example, here's how to convert 10 bars to atmospheres using the formula above.
How Many Atmospheres Are in a Bar?
There are 0.9869233 atmospheres in a bar, which is why we use this value in the formula above.
Our bar to standard atmosphere calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Bars and atmospheres are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Bar?
A bar is a unit of pressure equal to 100,000 pascals (Pa), the base unit for pressure. Metric pressure unit equal to 100,000 Pascals (100 kPa). [1]
The bar is classified as a metric and SI-compatible unit of pressure. Bars can be abbreviated as bar; for example, 1 bar can be written as 1 bar.
When working with bars (bar) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, bars (bar) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Standard Atmosphere?
A standard atmosphere is a unit of pressure equal to 101,325 pascals (Pa), the base unit for pressure. Standard sea-level atmospheric pressure defined as 101,325 Pascals. [2]
The standard atmosphere is classified as a standard unit of pressure. Atmospheres can be abbreviated as atm; for example, 1 standard atmosphere can be written as 1 atm.
When working with atmospheres (atm) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, atmospheres (atm) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within international standard workflows, engineering documentation, and technical data sheets.
When converting pressure between bars (bar) and atmospheres (atm), keep full floating-point precision (1 bar = 0.9869233 atm; 1 atm = 1.01325 bar) during intermediate calculations and round only the final standard atmosphere figure to match your instrument tolerance.
More Bar & Standard Atmosphere Conversions
Need to calculate in the opposite direction? Use our atmospheres to bars converter (atm to bar) to switch your starting unit immediately. You can also explore related tools such as converting torr to atmospheres, converting bars to psi, or converting bars to kilopascals.
Convert from Bars
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Bars (bar) to Atmospheres (atm)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Bar (bar) & Standard Atmosphere (atm)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (bar to atm)