Pressure Converter
Convert pressure between Pascal, bar, PSI, atm, mmHg, and more. Free online pressure unit conversion tool.
About this calculator
Tyre pressure in psi, weather in millibars, blood pressure in mmHg and industrial gauges in bar or kgf/cm² all describe the same physical quantity. This converter moves between pascals, kilopascals, megapascals, bar, millibar, atmospheres, psi, mmHg or torr, inches of mercury and kgf/cm².
A quick anchor: 1 atmosphere is 101,325 pascals, 1.01325 bar, 14.6959 psi and 760 mmHg.
How to use it
- Type the Value.
- Choose the From Unit and To Unit.
- Press Convert.
Factors (to pascal)
1 bar = 100,000 Pa, 1 atm = 101,325 Pa, 1 psi = 6,894.757 Pa, 1 mmHg = 133.322 Pa and 1 kgf/cm² = 98,066.5 Pa. Formula: value × from ÷ to.
Worked example
Tyre pressure of 32 psi
| Bar | 2.2063 |
| Kilopascal | 220.63 |
| Atmospheres | 2.1773 |
| kgf/cm² | 2.2498 |
1 atm = 14.6959 psi = 760 mmHg = 1.01325 bar.
Tips and common mistakes
- Many Indian tyre gauges show kgf/cm², which is nearly the same as bar (1 kgf/cm² = 0.98 bar).
- Check tyre pressure cold, before driving.
- Gauge pressure ignores the atmosphere; absolute pressure includes it.
- Blood pressure in mmHg: 120 mmHg is about 16 kPa.
- Weather: standard sea-level pressure is 1,013.25 millibar.
Frequently asked questions
How many psi are in a bar?
14.5038.
How many pascals in an atmosphere?
101,325.
What is mmHg?
A millimetre of mercury, used for blood pressure and vacuum. 1 mmHg is 133.322 Pa.
What is kgf/cm²?
A common Indian industrial unit, close to 1 bar.
What is gauge pressure?
Pressure relative to the surrounding air.
What is 1 kPa in psi?
0.145 psi.