Convert Inches of Mercury to Centimeters of Mercury
Convert Inches of Mercury (inHg) to Centimeters of Mercury (cmHg) instantly and accurately.
Conversion Formula
cmHg = inHg × 2.54
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.
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.
Quick Reference Table
| Inches of Mercury (inHg) | Centimeters of Mercury (cmHg) |
|---|---|
| 1 inHg | 2.54 cmHg |
| 2 inHg | 5.08 cmHg |
| 5 inHg | 12.7 cmHg |
| 10 inHg | 25.4 cmHg |
| 25 inHg | 63.5 cmHg |
| 50 inHg | 127 cmHg |
| 100 inHg | 254 cmHg |