Pressure
Convert millibar (mbar) 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 mbar = 0.01450377 psi
To convert millibar to pound per square inch, multiply the mbar value by 0.01450377. To go the other way, divide by 0.01450377 (or multiply by 68.94757).
| mbar | psi |
|---|---|
| 1 | 0.01450377 |
| 2 | 0.02900755 |
| 5 | 0.07251887 |
| 10 | 0.1450377 |
| 25 | 0.3625944 |
| 50 | 0.7251887 |
| 100 | 1.450377 |
| 250 | 3.625944 |
| 500 | 7.251887 |
| 1000 | 14.50377 |
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 10000 mbar is 145.0377 psi.
Multiply the value in mbar by 0.01450377 to get psi. For example, 10 mbar = 0.1450377 psi.
1 mbar equals 0.01450377 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.