Pressure Converter
Convert between pascal, bar, PSI, atmosphere, mmHg, torr, and more pressure units instantly.
Result
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All conversions
What is Pressure Converter?
A pressure converter lets you switch between units of pressure used in science, engineering, meteorology, and everyday applications. The SI unit is the pascal (Pa), but bar and PSI are common in industrial settings, atmospheres in chemistry, and mmHg in medicine for blood pressure readings. Different industries have settled on different units making conversions frequently necessary.
How to use
- 1 Enter the pressure value in the Value field.
- 2 Select the source unit from the From dropdown.
- 3 Select the target unit from the To dropdown.
- 4 The result and a full conversion table appear immediately.
- 5 Use the swap button to reverse the direction of conversion.
Formula
Example calculation
Standard atmospheric pressure is 1 atm = 101,325 Pa = 1.01325 bar = 14.696 PSI = 760 mmHg. To convert 2 bar to PSI: 2 × 100000 Pa / 6894.757 Pa/psi = 29.01 PSI.
Frequently asked questions
What is the difference between PSI and bar?
PSI (pounds per square inch) is an imperial unit common in the US for tire pressure and hydraulics. Bar is a metric unit slightly below one atmosphere. 1 bar = 14.504 PSI. Tire pressure gauges sold in the US typically show PSI; European ones show bar.
What is standard atmospheric pressure?
Standard atmospheric pressure is defined as 101,325 pascals, or 1 atm. It equals 1.01325 bar, 14.696 PSI, or 760 mmHg. This is the average air pressure at sea level.
Why is blood pressure measured in mmHg?
Blood pressure is historically measured in millimetres of mercury because early instruments used a column of mercury to measure pressure. The unit persists in medicine despite mercury no longer being used in modern sphygmomanometers.
What is the pascal in everyday terms?
One pascal is a very small pressure: roughly the weight of a small apple spread over one square metre. Atmospheric pressure is about 101,325 Pa, so kilopascals (kPa) and megapascals (MPa) are more practical for most applications.
How do I check if my tire pressure needs to be in bar or PSI?
Check your vehicle door jamb or owner manual for the recommended pressure. US vehicles typically list PSI (e.g. 32 PSI), while European vehicles list bar (e.g. 2.2 bar). Use this converter to switch between them.