mmHg to Kilopascal Converter

About this calculator

Millimeters of mercury (mmHg) is a pressure unit based on the height of a mercury column a given pressure can support, still the standard unit for reporting blood pressure and widely used in respiratory and anesthesia medicine. By definition, 1 mmHg = 133.322 pascals, so this converter multiplies your mmHg value by 0.133322 to get kilopascals (kPa), and can also express the result in plain pascals or bar.

Clinicians, respiratory therapists and lab technicians convert between mmHg and kPa constantly because blood pressure readings (like 120/80 mmHg) and manometer-based measurements are traditionally in mmHg, while blood gas values (PaO₂, PaCO₂) and many European and scientific instruments report in kPa — getting the conversion factor exactly right matters clinically, since a partial pressure of oxygen misread by a wrong conversion can look dangerously low or normal.