Pressure Converter
Convert between pascal, bar, psi, atmosphere, torr and more. Enter a value in any unit and see it instantly expressed in every other common unit of pressure.
Pressure usually travels with the other physics units: Energy and Power sit alongside it, and Temperature often appears in the same calculation.
How to use the Pressure Converter
- 1 Enter the pressure value.
- 2 Choose the source unit — pascal, kilopascal, bar, PSI, atmosphere, torr or millibar.
- 3 Read the equivalent in all the other units, which is handy for comparing a tyre gauge with a weather report.
- 4 Swap the units to convert the other way.
How It Works
Every unit is defined as a fixed multiple of the pascal, the SI base unit of pressure. Your input is first normalised to pascals and then rescaled, so the conversion is exact to the precision shown.
- Nine common pressure units
- All-unit conversion table
- Choose your output precision
- Handles very large and small values
- Runs entirely offline
Frequently asked questions
What is the difference between bar and atmosphere?
They are close but not identical. One standard atmosphere is 101,325 Pa and one bar is exactly 100,000 Pa, so an atmosphere is about 1.3% larger. That gap is small enough to ignore in casual use but not in engineering.
Why are tyre pressures in PSI?
A convention inherited from imperial measurement. Pounds per square inch is still the norm in the US, the UK and much of the world for consumer tyres, while Europe and vehicle manufacturers increasingly specify kilopascals or bar on the same placard.
What is one atmosphere in pascals?
Exactly 101,325 Pa, by definition — it was chosen to match the average sea-level pressure so the unit would be intuitive. Meteorologists often prefer hectopascals, which are numerically identical to millibars.
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