Type a value, choose the units and get an instant answer. The table below the converter shows the same value in every pressure unit, and all factors use exact or internationally standard definitions.
How to convert pressure units
- Enter the value.
- Pick the unit to convert from and to (⇄ swaps them).
- Read the result, formula and the table of all units.
Pressure units
| Unit | Symbol | About |
|---|---|---|
| Pascal | Pa | The SI unit of pressure: one newton per square metre. |
| Kilopascal | kPa | 1,000 pascals. Used for tyre pressure in many countries. |
| Bar | bar | 100 kPa, close to atmospheric pressure at sea level. |
| PSI | psi | Pounds per square inch. Used for tyre pressure in the US, UK and Pakistan. |
| Atmosphere | atm | Standard atmospheric pressure at sea level, 101.325 kPa. |
| Millimeter of mercury | mmHg | Used for blood pressure and vacuum measurements. |
| Millibar | mbar | One thousandth of a bar (the same as a hectopascal). Used in weather reports. |
Popular pressure conversions
PSI to Bar · Bar to PSI · kPa to PSI · PSI to kPa · ATM to PSI · mmHg to kPa · Bar to kPa
Frequently asked questions
How accurate is the pressure converter?
It uses exact definitions where they exist and shows up to 10 significant figures, more than enough for everyday, school and engineering use.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested