mmHg to kPa Calculator
Convert millimeters of mercury (mmHg) to kilopascals (kPa) instantly. Enter your mmHg value and get the kPa equivalent — used in medical, meteorological, and engineering applications.
mmHg to kPa Conversion Formula
The conversion between mmHg and kPa uses the following formula:
kPa = mmHg × 0.133322
Or inversely: mmHg = kPa ÷ 0.133322. The factor 0.133322 comes from the physical definition of one millimeter of mercury — the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity (9.80665 m/s²). This gives exactly 133.322 Pa per mmHg, or 0.133322 kPa per mmHg.
mmHg to kPa Conversion Table
Common mmHg to kPa conversions:
- 80 mmHg = 10.67 kPa
- 100 mmHg = 13.33 kPa
- 120 mmHg = 16.00 kPa
- 760 mmHg = 101.33 kPa (1 atm)
- 1000 mmHg = 133.32 kPa
Blood pressure is typically reported in mmHg in clinical settings, while kPa is standard in European medical and engineering contexts.
Medical and Scientific Applications
mmHg remains the dominant unit for blood pressure worldwide — a normal reading of 120/80 mmHg equals roughly 16.0/10.7 kPa. In respiratory medicine, blood gas values like PaO₂ and PaCO₂ are measured in mmHg in the US but kPa in the UK and Europe, making this conversion essential for international clinical data. In vacuum technology and semiconductor manufacturing, pressures are specified in either unit depending on the equipment standard. Weather stations in some countries use hPa (equivalent to mbar), but scientific reports often require kPa or mmHg depending on the discipline.
Frequently Asked Questions
How do you convert mmHg to kPa?
To convert mmHg to kPa, multiply the mmHg value by 0.133322. Formula: kPa = mmHg × 0.133322. For example, 760 mmHg = 760 × 0.133322 = 101.325 kPa (standard atmospheric pressure).
What is 1 mmHg in kPa?
1 mmHg equals 0.133322 kPa. This is the standard conversion factor based on the definition of mmHg (pressure exerted by a 1 mm column of mercury at 0°C).
What is 120 mmHg in kPa?
120 mmHg equals 15.999 kPa. This value is commonly referenced in blood pressure readings (systolic pressure).
What is 760 mmHg in kPa?
760 mmHg = 101.325 kPa. This is the standard atmospheric pressure at sea level, also expressed as 1 atm.
Where is mmHg to kPa conversion used?
This conversion is widely used in medicine (blood pressure, blood gas analysis), meteorology (barometric pressure), vacuum technology, and industrial gas systems.
Is mmHg the same as torr?
For practical purposes, 1 mmHg ≈ 1 torr. They differ by less than 0.000015%, so they are used interchangeably in most applications.