How to use the pressure converter
This pressure converter lets you switch between common pressure units in one place. Choose the unit you are converting from and the unit you want to convert to, enter a non-negative value, and click "Convert" to see the result. A "Swap" button reverses the from and to units so you can check conversions in both directions without retyping. All conversions use the Pascal (Pa) as the base: every unit is defined relative to Pascals, so the tool stays consistent and accurate.
Pressure conversion is useful in many situations. Tire pressure is often given in psi in the US and in bar or kPa elsewhere. Weather reports may use bar, millibars, or inches of mercury. Blood pressure is usually measured in mmHg. Engineers and scientists work in Pascals or kilopascals. Scuba divers and pilots deal with atmospheres and bar. Whether you are checking your car's tire pressure, reading a weather map, comparing medical readings, or doing homework, having a single tool that handles Pa, kPa, bar, psi, atm, torr, and mmHg saves time and reduces errors.
The converter runs entirely in your browser. There is no sign-up, no download, and no delay. It is designed to be mobile-friendly: the two-column layout stacks on small screens, inputs have a comfortable touch size, and the result appears next to your input so you can compare at a glance. Results are shown with up to six decimal places when needed. Standard atmospheric pressure at sea level is 1 atm = 101,325 Pa; the converter uses these standard definitions for all units.
Bookmark this page for quick access whenever you need to convert pressure between different units. Whether you are at the gas station, in the lab, or in the cockpit, this free pressure converter provides fast, accurate, and easy-to-read results on any device.