Pressure converter
Type a value and pick the starting unit: PSI, bar, atmospheres, pascals and mmHg convert in real time, with a practical reference for car tire pressure.
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Tire pressure: PSI and bar
In the US tire pressure is measured in PSI, while most of Europe uses bar: a typical passenger car runs between 32 and 35 PSI, which is roughly 2.2 to 2.4 bar, often with different values for the front and rear axles and higher settings when fully loaded. Always check the pressure when the tires are cold — after just a few miles of driving it rises noticeably. Keep in mind these numbers are only ballpark figures and don't replace the manufacturer's specs: always follow the values in your owner's manual or on the sticker inside the driver's door jamb.
Pressure units explained in a nutshell
The pascal is the SI unit, but it's so tiny that in practice we use its multiples: 1 bar is exactly 100,000 pascals, while 1 atmosphere (101,325 Pa) is the average air pressure at sea level — which is why bar and atm are nearly identical. PSI (pounds per square inch) dominates in the US for everything from tires to plumbing, kPa shows up on many tire placards and weather reports, and mmHg — the "millimeter of mercury" — lives on in meteorology and blood pressure monitors.