Pressure Converter
Convert pressure between pascals, kilopascals, bar, PSI, atmospheres and torr — free, instant and private. Every conversion is worked out right in your browser.
How to use the pressure converter
- Enter a value. Type the pressure you want to convert into the Value box — for example, 32 to convert 32 psi.
- Choose your units. Pick the unit to convert from and the unit to convert to, and use the ⇄ button to swap them instantly.
- Read the result. The converted pressure appears at once, with a full table showing the same value across every other pressure unit.
About this tool
This free pressure converter is built for tyre pressures given in PSI, bar or kPa, weather readings in millibar and atmospheres, scuba and industrial gauges, and vacuum or blood-pressure figures measured in torr (millimeters of mercury). The pascal is the SI base unit, and every other unit is defined against it: 1 bar is exactly 100,000 Pa, 1 atmosphere is 101,325 Pa, and 1 psi is about 6,894.76 Pa.
Because pressure units come from so many different fields, converting between them by hand is error-prone; this tool does it instantly and shows the whole conversion table at a glance. All calculations run locally in your browser with JavaScript, so nothing you enter leaves your device, and the converter continues to work offline once the page has loaded.
Frequently asked questions
How many PSI are in one bar?
One bar equals about 14.5038 psi. So a tyre inflated to 2.2 bar is roughly 31.9 psi. To convert bar to psi, multiply by 14.5038; to go the other way, divide.
What is one atmosphere of pressure?
One standard atmosphere (atm) is defined as 101,325 pascals. That equals 1.01325 bar, about 14.696 psi, or exactly 760 torr — roughly the average air pressure at sea level.
What is torr, and how does it relate to mmHg?
One torr is 1/760 of an atmosphere, about 133.322 pascals, and is virtually identical to one millimeter of mercury (mmHg). It is common in vacuum science and in blood-pressure readings.
What pressure should my car tyres be?
Most passenger cars call for around 30–35 psi (about 2.1–2.4 bar or 210–240 kPa), but always follow the figure on the sticker inside the driver's door or in the owner's manual.