🧪 Bar to atm Converter
Translate industrial pressure readings into atmospheres.
Great for chemical engineering, scuba calculations, and comparing gauge data to atmospheric baseline.
2.5 Bar (bar) equals
2.467308 Atmospheres (atm)
SI Reference
Pascals: 250,000 Pa
How to Use This Calculator
Enter bar
Type the pressure in bar from your process data.
Read atmospheres
The calculator outputs the equivalent atm value and the SI pascal reference.
Document the conversion
Use the results in reports, design notes, or compliance forms requiring atm.
Formula
1 bar = 100,000 Pa
1 atm = 101,325 Pa
atm = bar × (100,000 ÷ 101,325) ≈ bar × 0.986923
Use the formula breakdown to confirm the calculation logic or perform the conversion manually if needed.
Full Description
Bar is a convenient metric unit close to atmospheric pressure. Converting to atm helps when comparing line pressures to ambient conditions or when working with legacy formulas that expect atmospheric units.
This converter uses exact SI relationships, delivering reliable results for engineering calculations and lab logbooks.
The pascal reference is included so you can double-check calculations with software that expects SI base units.
Frequently Asked Questions
Is bar an SI unit?
Bar is not an SI unit but is widely used. 1 bar equals 100 kPa exactly, making conversions straightforward.
How many atm is 1 bar?
Approximately 0.986923 atm. This converter uses the precise ratio derived from Pascals.
Does this handle gauge pressure?
This calculator uses absolute pressure. For gauge values use the bar-to-psig page.
Can I convert atm back to bar?
Yes. Use the atm conversion tool or divide atm by 0.986923 to get bar.