Pressure Converter Calculator
Convert pressure among pascals, kilopascals, bar, atmospheres, pounds per square inch, and millimeters of mercury. The calculator asks for a Value, From unit, and To unit, then returns the selected conversion and all supported units.
Pressure is force spread over area, so unit choice depends on context. Tires often use psi, weather and engineering may use kPa or bar, and medical readings often use mmHg. For a focused imperial-metric pressure conversion, see the bar to PSI converter; for medical context, use the blood pressure calculator.
How to use this calculator
- Enter a nonnegative pressure value.
- Select the unit the value is currently in.
- Select the target unit.
- Use the converted value with the precision your specification requires.
Conversion formula
The calculator converts to pascals first.
| Unit | Factor in pascals |
|---|---|
| 1 Pa | 1 Pa |
| 1 kPa | 1,000 Pa |
| 1 bar | 100,000 Pa |
| 1 atm | 101,325 Pa |
| 1 psi | 6,894.76 Pa |
| 1 mmHg | 133.322 Pa |
Worked example: 35 psi × 6,894.76 = 241,316.6 Pa. Divide by 1,000 to get 241.317 kPa.
For physics problems involving load over area, the force converter can be useful alongside this pressure conversion.