mmHg to kPa Converter
To convert mmHg to kPa, multiply by 0.133322, or divide by 7.50062. 760 mmHg, one standard atmosphere, is 101.325 kPa, and 120 mmHg is 15.9987 kPa.
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How It Works
mmHg survives in medicine, vacuum work and laboratory data, while engineering and SI-based standards use the kilopascal. One millimetre of conventional mercury (13,595.1 kg/m³ under standard gravity) exerts 133.322 Pa, which is 0.133322 kPa.
A quick check: 7.5 mmHg is very close to 1 kPa (0.999918 kPa), so dividing mmHg by 7.5 gets you within 0.01%.
Formula
kPa = mmHg × 0.133322
Dividing by 7.50062 gives the same result. The torr (exactly 1/760 atm) converts with the same factor to six significant figures.
Worked Example
A vacuum oven is set to 50 mmHg absolute:
50 × 0.133322 = 6.6661 kPa
mmHg to kPa Table
| mmHg | kPa | psi |
|---|---|---|
| 1 mmHg | 0.133322 kPa | 0.0193368 psi |
| 5 mmHg | 0.666612 kPa | 0.0966839 psi |
| 10 mmHg | 1.33322 kPa | 0.193368 psi |
| 20 mmHg | 2.66645 kPa | 0.386736 psi |
| 50 mmHg | 6.66612 kPa | 0.966839 psi |
| 60 mmHg | 7.99934 kPa | 1.16021 psi |
| 80 mmHg | 10.6658 kPa | 1.54694 psi |
| 90 mmHg | 11.999 kPa | 1.74031 psi |
| 100 mmHg | 13.3322 kPa | 1.93368 psi |
| 120 mmHg | 15.9987 kPa | 2.32041 psi |
| 140 mmHg | 18.6651 kPa | 2.70715 psi |
| 160 mmHg | 21.3316 kPa | 3.09388 psi |
| 200 mmHg | 26.6645 kPa | 3.86736 psi |
| 500 mmHg | 66.6612 kPa | 9.66839 psi |
| 760 mmHg | 101.325 kPa | 14.696 psi |
Going the other way? Use the kPa to mmHg converter. For atmospheres, use the mmHg to atm converter.
FAQ
Common questions about converting mmHg to kPa.
Frequently Asked Questions
How do I convert mmHg to kPa?
Multiply mmHg by 0.133322. For example, 760 mmHg × 0.133322 = 101.325 kPa.
How many kPa is 1 mmHg?
1 mmHg is 0.133322 kPa, or 133.322 Pa.
What is 120/80 mmHg in kPa?
120 mmHg is 16 kPa and 80 mmHg is 10.7 kPa, so a blood pressure of 120/80 mmHg reads 16/10.7 kPa.
How do I convert mmHg to psi?
Multiply by 0.0193368, or divide by 51.7149. 100 mmHg is 1.93368 psi.
Is mmHg an SI unit?
No. The SI unit of pressure is the pascal, and 1 kPa is 1,000 Pa. mmHg is a non-SI unit kept in use for blood pressure and some vacuum and laboratory work, where instruments and records read in it.
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