Convert Centimeters of Mercury to Hectopascals
Convert Centimeters of Mercury (cmHg) to Hectopascals (hPa) instantly and accurately.
Conversion Formula
hPa = cmHg × 13.33223874
About Centimeters of Mercury
One centimetre of mercury (cmHg) = 10 mmHg ≈ 1,333.22 Pa. Historical medical and physiological literature used cmHg for intracardiac and intravascular pressures before mmHg became universal. Left ventricular systolic pressure ~12 cmHg; pulmonary artery systolic 2-3 cmHg. Some older European cardiological textbooks and pre-1970s surgical literature report pressures in cmHg. Central venous pressure, cerebral perfusion pressure, and intra-abdominal pressure are occasionally cited in cmHg in legacy datasets. 1 cmHg = 1,333.22 Pa.
About Hectopascals
A hectopascal (hPa) = 100 Pa = 1 mbar - the WMO-official SI-compatible meteorological pressure unit since 1986, replacing millibar with no numerical change. All modern surface observations (METAR, SYNOP), digital barometers, aviation weather, and weather apps report in hPa. QNH altimeter settings outside North America are in hPa. ICAO standard sea-level pressure is 1013.25 hPa. Continental high-pressure record exceeds 1084 hPa; Typhoon Tip (1979) holds the low record at ~870 hPa. 1 hPa = 100 Pa.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Hectopascals (hPa) |
|---|---|
| 1 cmHg | 13.3322 hPa |
| 2 cmHg | 26.6645 hPa |
| 5 cmHg | 66.6612 hPa |
| 10 cmHg | 133.322 hPa |
| 25 cmHg | 333.306 hPa |
| 50 cmHg | 666.612 hPa |
| 100 cmHg | 1333.22 hPa |