Pressure
Convert pound per square inch (psi) to megapascal (MPa). Pressure is force per unit area. Process engineers move constantly between SI (kPa, bar) and US (psi) units, and between absolute and gauge.
1 psi = 0.006894757 MPa
To convert pound per square inch to megapascal, multiply the psi value by 0.006894757. To go the other way, divide by 0.006894757 (or multiply by 145.0377).
| psi | MPa |
|---|---|
| 1 | 0.006894757 |
| 2 | 0.01378951 |
| 5 | 0.03447378 |
| 10 | 0.06894757 |
| 25 | 0.1723689 |
| 50 | 0.3447378 |
| 100 | 0.6894757 |
| 250 | 1.723689 |
| 500 | 3.447379 |
| 1000 | 6.894757 |
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 145.0377 psi is 1 MPa.
Multiply the value in psi by 0.006894757 to get MPa. For example, 10 psi = 0.06894757 MPa.
1 psi equals 0.006894757 MPa.
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.