Convert Centimeters of Mercury to Inches of Mercury
Convert Centimeters of Mercury (cmHg) to Inches of Mercury (inHg) instantly and accurately.
Conversion Formula
inHg = cmHg × 0.3937007874
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 Inches of Mercury
One inch of mercury (inHg) ≈ 3,386 Pa - the primary barometric pressure unit in US aviation and meteorology. ASOS weather stations, METARs, and altimeter settings in the US report in inHg. Standard sea-level pressure is 29.92 inHg. Altimeters are set to local QNH in inHg to maintain altitude reference. US barometers for home weather stations display inHg. Typical pressure range: 28.5-31.0 inHg in continental weather systems. Record low: ~25.70 inHg (Typhoon Tip, 1979). 1 inHg = 3,386.39 Pa.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Inches of Mercury (inHg) |
|---|---|
| 1 cmHg | 0.393701 inHg |
| 2 cmHg | 0.787402 inHg |
| 5 cmHg | 1.9685 inHg |
| 10 cmHg | 3.93701 inHg |
| 25 cmHg | 9.84252 inHg |
| 50 cmHg | 19.685 inHg |
| 100 cmHg | 39.3701 inHg |