kPa to mmHg Conversion

Use this free online kPa to mmHg conversion calculator to instantly convert pressure values from kilopascals (kPa) to millimeters of mercury (mmHg) and vice versa. Whether you're a medical professional checking blood pressure equivalents, a meteorologist interpreting barometric pressure readings, an engineer working with pressure systems, or a student learning about pressure units, this converter provides fast and accurate results.

The conversion is based on the physical relationship between these two pressure units. One millimeter of mercury (mmHg) is defined as the pressure exerted by a 1 mm column of mercury at 0°C under standard gravity, which equals 133.322 pascals. Since 1 kilopascal equals 1000 pascals, the conversion factor is: 1 kPa = 1000 / 133.322 = 7.50062 mmHg. To convert, simply multiply your kPa value by 7.50062 to get mmHg. For reverse conversion, multiply mmHg by 0.133322 to get kPa.

Standard atmospheric pressure at sea level is 101.325 kPa, which equals exactly 760 mmHg. This relationship is fundamental in meteorology where barometric pressure is reported in both units depending on the region — Canada and Europe commonly use kPa while the United States uses inches of mercury (inHg) or mmHg.

Regional Notes

• India: Blood pressure is commonly measured in mmHg, while industrial and engineering applications use kPa. The Indian Meteorological Department reports atmospheric pressure in hPa (hectopascals), where 1 hPa = 0.1 kPa.
• United States: Blood pressure readings are always in mmHg. Weather reports use inches of mercury (inHg, where 1 inHg = 3.38639 kPa). Industrial gauges may use PSI or kPa depending on the application.
• United Kingdom: The NHS measures blood pressure in mmHg. Weather reports from the Met Office use both hPa and mmHg. Engineering and scientific contexts use kPa as part of the SI system.