Millimetres of mercury to kilopascals
Multiply millimetres of mercury by 0.133322 to get kilopascals.
120 mmHg = 15.9987 kPa
How to convert millimetres of mercury to kilopascals
The kilopascal is one thousand pascals (10³ Pa), the metric pressure unit. The millimetre of mercury is the conventional millimetre of mercury, exactly 101325/760 pascals (about 133.322 Pa), equal to the torr.
Worked example — 120 mmHg: 120 × 0.133322 = 15.9987 kPa.
Millimetres of mercury to kilopascals table
| Millimetres of mercury | Kilopascals |
|---|---|
| 60 mmHg | 7.9993 kPa |
| 80 mmHg | 10.6658 kPa |
| 90 mmHg | 11.999 kPa |
| 100 mmHg | 13.3322 kPa |
| 120 mmHg | 15.9987 kPa |
| 140 mmHg | 18.6651 kPa |
| 160 mmHg | 21.3316 kPa |
| 200 mmHg | 26.6645 kPa |
| 760 mmHg | 101.325 kPa |
Reverse and related
About millimetres of mercury and kilopascals
Millimetre of mercury (mmHg)
1 mmHg = 0.133322 kPaDefinition. The conventional millimetre of mercury, exactly 101325/760 pascals (about 133.322 Pa), equal to the torr
History and origin
The millimetre of mercury comes from mercury barometers, where pressure was read as the height of a mercury column. It is now fixed conventionally as one 760th of a standard atmosphere, essentially equal to the torr.
Current use
mmHg is the standard unit for blood pressure — a reading of 120/80 mmHg — and for measuring vacuums.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Kilopascal (kPa)
1 kPa = 7.5006 mmHgDefinition. One thousand pascals (10³ Pa), the metric pressure unit
History and origin
The kilopascal is one thousand pascals, a metric multiple of the SI pressure unit. It gives conveniently sized numbers for everyday pressures.
Current use
Kilopascals are used for tyre pressure in metric countries and throughout engineering.
Source: NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi)
Where people use this
Millimetres of mercury: blood pressure, vacuum measurement. Kilopascals: tyre pressure (metric), engineering. A 120 mmHg blood-pressure reading is about 16 kPa.
Every value is carried to full double precision; the display is rounded.
Both units are defined in NIST SP 811, App. B; ISO 80000-4. Exact SI values are definitional (bar = 10⁵ Pa, atm = 101 325 Pa) or derived from the pound (NIST HB 44) and standard gravity 9.80665 m/s² (psi).
Questions people ask
How many kPa is 120 mmHg?
A 120 mmHg reading is about 16 kPa. To convert mmHg to kPa, multiply by 0.1333.
How many kPa in a mmHg?
One mmHg is about 0.133 kPa.
What is 120/80 mmHg in kPa?
A 120/80 mmHg blood pressure is about 16/10.7 kPa.
How many kPa is 760 mmHg?
760 mmHg, which is one atmosphere, is about 101.3 kPa.