Pressure
Convert kilopascal (kPa) to millimetre of mercury (mmHg). Pressure is force per unit area. Process engineers move constantly between SI (kPa, bar) and US (psi) units, and between absolute and gauge.
1 kPa = 7.500616 mmHg
To convert kilopascal to millimetre of mercury, multiply the kPa value by 7.500616. To go the other way, divide by 7.500616 (or multiply by 0.1333224).
| kPa | mmHg |
|---|---|
| 1 | 7.500616 |
| 2 | 15.00123 |
| 5 | 37.50308 |
| 10 | 75.00616 |
| 25 | 187.5154 |
| 50 | 375.0308 |
| 100 | 750.0616 |
| 250 | 1875.154 |
| 500 | 3750.308 |
| 1000 | 7500.616 |
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 1000 kPa is 7500.616 mmHg.
Multiply the value in kPa by 7.500616 to get mmHg. For example, 10 kPa = 75.00616 mmHg.
1 kPa equals 7.500616 mmHg.
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.