Pressure Converter●
From bar to psi, and pascals to atmospheres. The same pressure, in your preferred unit.
Pressure
Converts units only: gauge stays gauge and absolute stays absolute. No atmospheric offset is applied.
Definitions: NIST pressure conversions ↗Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Common conversions
Pick an example to startAll equivalent units
The same value, in every supported unit.
Change the unit, keep the reference.
Gauge stays gauge; absolute stays absolute. Converting between those references requires the ambient pressure. Torr is listed explicitly, rather than treated as an exact synonym for mmHg.
- 1 bar
- 100 kPa
- 1 atm
- 101.325 kPa
- 1 hPa
- 1 mbar
Calculation details & precision
Pressure conversions use pascals as the base unit. One bar is exactly 100,000 Pa; one standard atmosphere is exactly 101,325 Pa; one Torr is 1/760 of a standard atmosphere. PSI uses the international pound-force and inch: 1 psi is approximately 6,894.75729317 Pa. Converting units preserves the pressure reference.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
How do I convert bar to psi?
One bar is approximately 14.503773773 psi. Multiply a value in bar by this factor to express it in psi. The converter calculates using the underlying definitions before rounding the displayed result.
Are bar and standard atmosphere the same?
No. One bar is exactly 100,000 Pa, while one standard atmosphere (atm) is exactly 101,325 Pa. Therefore 1 atm equals 1.01325 bar.
Does converting psi to bar change gauge pressure into absolute pressure?
No. Unit conversion preserves the reference: gauge stays gauge, absolute stays absolute, and a pressure difference stays a difference. Gauge-to-absolute conversion also requires ambient pressure.
Are hPa and mbar equivalent?
Yes. One hectopascal and one millibar both equal exactly 100 Pa.
Is Torr exactly the same as mmHg?
A Torr is exactly 1/760 of a standard atmosphere. Conventional millimetres of mercury use a slightly different definition, so this converter offers Torr rather than silently treating the two as identical.