Pressure Converter
Convert pressure between psi, bar, kilopascal, atmosphere, and mmHg.
How to use the pressure converter
Type a value, pick the unit you have, and choose the unit you want. The result updates as you type, and the swap button flips the two units to read the conversion the other way.
It covers the units people actually reach for: psi for tires, bar and kPa for engineering, atmospheres for diving and chemistry, and mmHg (torr) for blood pressure and vacuum work.
Common pressure conversions
| 1 bar | 14.5038 psi |
| 1 psi | 6.89476 kilopascal |
| 1 atmosphere | 101.325 kilopascal |
| 1 atmosphere | 760 mmHg (torr) |
| 1 bar | 100 kilopascal |
| 1 kilopascal | 0.145038 psi |
About pressure units
The pascal is the SI unit of pressure: one newton spread over one square meter. It is small, so everyday readings use bigger multiples like the kilopascal and the bar, which sits close to normal air pressure at sea level.
The United States still uses psi for tires, pumps, and pipes, while weather reports lean on hectopascals and millibars. Medicine and vacuum systems keep the older mmHg. This tool holds each factor exact, so a bar always reads as 14.5038 psi.
Frequently asked questions
- How many psi are in a bar?
- One bar equals about 14.5038 psi. So a tire at 2 bar sits near 29 psi. To go from psi to bar, divide by that same figure or use the swap button.
- What is the difference between bar and atmosphere?
- They are close but not equal. One atmosphere is 101.325 kilopascal, while one bar is exactly 100 kilopascal. An atmosphere is about 1.3 percent higher than a bar.
- How do I convert kPa to psi?
- Multiply kilopascals by 0.145038. So 200 kPa is about 29 psi. Many tire gauges show both scales, and this converter matches them.
- What is mmHg used for?
- Millimeters of mercury, also called torr, measure blood pressure and vacuum levels. One atmosphere equals 760 mmHg, which is why a normal reading sits well below that.