Pressure
Convert megapascal (MPa) to pound per square inch (psi). Pressure is force per unit area. Process engineers move constantly between SI (kPa, bar) and US (psi) units, and between absolute and gauge.
1 MPa = 145.0377 psi
To convert megapascal to pound per square inch, multiply the MPa value by 145.0377. To go the other way, divide by 145.0377 (or multiply by 0.006894757).
| MPa | psi |
|---|---|
| 1 | 145.0377 |
| 2 | 290.0755 |
| 5 | 725.1887 |
| 10 | 1450.377 |
| 25 | 3625.944 |
| 50 | 7251.887 |
| 100 | 14503.77 |
| 250 | 36259.44 |
| 500 | 72518.87 |
| 1000 | 145037.7 |
Line and vessel ratings, pump discharge heads, and relief set points are all specified in pressure units — usually psi or barg in the field and kPa in calculations.
Always track whether a value is absolute or gauge: 0 barg equals about 101.3 kPa absolute, and mixing the two is a common and costly error.
Worked example. A pressure of 1 MPa is 145.0377 psi.
Multiply the value in MPa by 145.0377 to get psi. For example, 10 MPa = 1450.377 psi.
1 MPa equals 145.0377 psi.
Line and vessel ratings, pump discharge heads, and relief set points are all specified in pressure units — usually psi or barg in the field and kPa in calculations.