Pressure Converter
Enter a pressure and its unit to see the equivalent in pascals, kilopascals, bar, atmospheres, and PSI.
How pressure conversion works
The pascal (Pa) is the SI base unit of pressure, defined as one newton of force per square meter. Kilopascals (1,000 Pa) and bar (100,000 Pa) are common metric multiples used in weather, engineering, and tire pressure contexts.
One standard atmosphere (atm) is defined as exactly 101,325 Pa — roughly the average air pressure at sea level. PSI (pounds per square inch), common in the US, equals about 6,894.76 Pa.
Frequently asked questions
How many PSI is one bar?
1 bar is approximately 14.504 PSI.
What's standard atmospheric pressure?
Standard atmospheric pressure at sea level is defined as 101,325 Pa (1 atm), though actual local pressure varies with weather and altitude.
Why do tire pressures use different units in different countries?
PSI is common in the US, while bar or kPa are more common in Europe and most of the rest of the world — all describe the same physical quantity, just with different unit conventions.