Pressure Converter
Enter a value and choose your source and target units to convert instantly between psi, bar, kilopascals, atmospheres, and millimeters of mercury (mmHg).
Converted value
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How the Pressure Converter formula works
Every unit routes through kilopascals as a common base:
value_in_kPa = value × factor_of_source_unit result = value_in_kPa / factor_of_target_unit
For example, 1 psi = 6.89476 kPa and 1 atm = 101.325 kPa.
Step-by-step calculation
- Multiply the entered value by its unit's conversion factor to get kilopascals.
- Divide that value by the target unit's conversion factor.
- Round to a sensible number of decimal places.
Worked example
Converting 32 psi (a common tire pressure) to bar: 32 × 6.89476 = 220.6 kPa. 220.6 / 100 = 2.21 bar.
Frequently asked questions
Why do tire pressures use psi in the US but bar elsewhere?
It's largely a regional convention — psi (pounds per square inch) is standard in the US, while bar and kPa are more common in Europe and much of the rest of the world for the same underlying measurement.