Popular pressure conversions
Pressure units
Pressure is force per unit area. The SI unit is the pascal, one newton per square meter. Tire pressures are given in psi or bar, weather in hectopascals or millibars, and blood pressure in millimeters of mercury.
| Unit | Symbol | In pascals | Definition |
|---|---|---|---|
| Pascal | Pa | 1 Pa | The SI unit of pressure: one newton per square meter. |
| Hectopascal | hPa | 100 Pa | One hundred pascals, identical to the millibar. Used in weather reports. |
| Kilopascal | kPa | 1,000 Pa | One thousand pascals. |
| Megapascal | MPa | 1,000,000 Pa | One million pascals, used for material strength. |
| Bar | bar | 100,000 Pa | Exactly 100,000 pascals, close to atmospheric pressure at sea level. |
| Millibar | mbar | 100 Pa | |
| Standard atmosphere | atm | 101,325 Pa | Exactly 101,325 pascals, average sea-level pressure. |
| Pound per square inch | psi | 6,894.757293 Pa | About 6.895 kilopascals, the usual unit for US tire pressure. |
| Millimeter of mercury | mmHg | 133.3223874 Pa | About 133.3 pascals, still the unit for blood pressure. |
| Torr | Torr | 133.3223684 Pa | |
| Inch of mercury | inHg | 3,386.389 Pa |
Calculate with pressure
The smart calculator does arithmetic across pressure units and picks a sensible unit for the answer. Try 32 psi to bar.
Questions and answers
Which pressure units can I convert?
All 11: pascals, hectopascals, kilopascals, megapascals, bar, millibars, standard atmospheres, pounds per square inch, millimeters of mercury, torr, inches of mercury.
What is the SI unit of pressure?
This converter uses the pascal (Pa) as its base unit. Pressure is force per unit area. The SI unit is the pascal, one newton per square meter. Tire pressures are given in psi or bar, weather in hectopascals or millibars, and blood pressure in millimeters of mercury.
What tire pressure is 32 psi in bar?
32 psi is about 2.21 bar, or 220.6 kPa.
How precise are the results?
Factors are the exact legal definitions where one exists (an inch is exactly 2.54 cm, a pound exactly 0.45359237 kg). Results show 10 significant digits by default; the precision menu offers 4 to 15.
Does the pressure converter work offline?
Yes. ConvertEasy is a progressive web app: after your first visit it keeps working with no connection, and you can install it to your home screen from the browser menu.