Pressure Converter
A tire gauge in psi, a weather report in bar, a lab reading in pascals — pick the unit you have and read the rest off the grid.
How it works
The pascal is the base unit, though it's tiny — one newton spread over a square meter. Your value converts to pascals first, then out to kPa, bar, psi, and atmospheres, all updating as you type.
Everyday pressures are big multiples of a pascal, which is why the other units exist. One bar is 100,000 Pa and sits close to sea-level air pressure, so weather and diving both lean on it.
Tires and plumbing in the US run on psi. A pound per square inch is 6,894.76 Pa, and typical car tires sit around 32 psi. Converting to bar or kPa is common when a manual uses metric specs.
Frequently asked questions
How many psi are in a bar?
One bar is about 14.5 psi. Since a bar is close to normal atmospheric pressure, that's a handy anchor: 2 bar of tire pressure is roughly 29 psi.
What's the difference between bar and atm?
They're close but not equal. One standard atmosphere is 101,325 Pa, while a bar is exactly 100,000 Pa — so an atm is about 1.3 percent larger than a bar.
How do I convert psi to kPa?
Multiply by 6.895. So 30 psi is roughly 207 kPa. Set the from-unit to psi, type the reading, and the kilopascal row gives you the exact figure.