About this Pressure converter
Convert PSI, bar, pascal, kilopascal, and atmosphere values instantly. Enter a pressure value, choose your source and target unit, and get an accurate result for tyre pressure checks, industrial specifications, weather data, and engineering reference.
How to use this pressure converter
Enter the number you want to convert.
Choose the source unit and target unit from the dropdowns.
Review the live result or open a preset example to jump into a common conversion.
When to use this converter
Your car or bicycle tyre pressure is listed in bar on the sidewall but the pump gauge reads in PSI, and you need to find the correct target value before inflating.
An industrial or mechanical specification gives a working pressure in bar or kilopascal but your gauge or system is calibrated in PSI.
A weather report or barometric pressure reading is given in hectopascals or kilopascals and you want to convert it to a more familiar unit for comparison.
You are reviewing a product data sheet for a pump, compressor, or regulator and the rated pressure is expressed in a unit different from your system's gauge.
Common problems and fixes
The PSI result looks much higher than the bar value I entered.
PSI values are always much larger than bar values for the same pressure — one bar equals approximately 14.5 PSI. A tyre inflated to 2.5 bar is correctly about 36.3 PSI.
I need to convert hectopascals (hPa) but the option is not listed.
One hectopascal equals 100 pascals. Enter your hPa value, multiply it by 100 in your head, and use pascals as the source unit. Alternatively, one hPa equals 0.1 kilopascals, so dividing by 10 lets you use kilopascals as the source.
The atmosphere (atm) result does not match a reference I found.
This converter uses the standard atmosphere (atm), defined as exactly 101,325 pascals. Some references use the technical atmosphere (at), which equals 98,066.5 pascals and gives slightly different results.
Available units
Pascal
Pa
Kilopascal
kPa
Bar
bar
Pound per square inch
psi
Atmosphere
atm
Related unit converter pages
Frequently asked questions
How do I convert bar to PSI?
Select bar as the source unit and PSI as the target. One bar equals approximately 14.504 PSI.
What is 30 PSI in bar?
30 PSI equals approximately 2.07 bar.
How do I convert kPa to PSI?
Select kilopascal as the source and PSI as the target. One kilopascal equals approximately 0.145 PSI.
What is 1 atmosphere in bar?
One standard atmosphere equals approximately 1.013 bar.
Is this pressure converter free to use?
Yes. It is free and works directly in your browser with no account required.
What pressure units does this converter support?
Pascal, kilopascal, bar, PSI (pound per square inch), and atmosphere (atm).