Pressure Converter
Convert between pressure units like bar, psi, pascal, and atm. Free online pressure converter with a full unit table.
From
To
Pascal (Pa) to other pressure units
| Unit | Value |
|---|---|
| Kilopascal (kPa) | 0.001 |
| Megapascal (MPa) | 0.000001 |
| Bar | 0.00001 |
| Pound per sq inch (psi) | 0.0001450377 |
| Atmosphere (atm) | 0.0000098692 |
| Millimeter mercury (mmHg) | 0.0075006158 |
| Kilogram per sq cm (kg/cm²) | 0.0000101972 |
How Does the Pressure Converter Work?
Enter a value and choose your source and target pressure units. The converter uses exact conversion factors (e.g. 1 atm = 101,325 Pa, 1 psi = 6,894.76 Pa) to compute the result instantly. Use the swap button to reverse the conversion, and the table below the fields converts your value to every other supported unit at once.
Example
Tire pressures are often quoted in psi. If a gauge reads 32 psi, that is 32 × 6,894.76 = 220,632 Pa, or about 2.21 bar. Converting the other way, 1 bar is roughly 14.5 psi.
Common Use Cases
- Reading tire or air-line pressures between psi and bar.
- Converting lab measurements between Pa, kPa, and mmHg.
- Engineering design across SI and Imperial pressure units.
- Comparing weather, scuba, and hydraulic pressure readings.
Conversion Factors
| Unit | Pascal (Pa) | psi | atm |
|---|---|---|---|
| 1 Pa | 1 | 0.000145 | 0.00000987 |
| 1 kPa | 1,000 | 0.145 | 0.00987 |
| 1 MPa | 1,000,000 | 145.038 | 9.869 |
| 1 bar | 100,000 | 14.504 | 0.987 |
| 1 psi | 6,894.76 | 1 | 0.068 |
| 1 atm | 101,325 | 14.696 | 1 |
| 1 mmHg | 133.322 | 0.0193 | 0.00132 |
| 1 kg/cm² | 98,066.5 | 14.223 | 0.968 |
FAQs
Are these conversions exact?
The factors are based on standard definitions and are exact to high precision (e.g. 1 atm = 101,325 Pa exactly). Results are rounded for display but calculated at full precision.
What is a mmHg and where is it used?
mmHg (millimeters of mercury), also called torr, measures pressure by the height of a mercury column. It is commonly used in medicine for blood pressure and in vacuum and weather measurements.
What is the difference between gauge and absolute pressure?
This converter handles absolute pressure values. Gauge pressure measures pressure relative to the surrounding atmosphere, so it excludes the ~1 atm that is always present. Always make sure you know which scale you are working with.