Convert Centimeters of Mercury to Pounds per Square Inch
Convert Centimeters of Mercury (cmHg) to Pounds per Square Inch (psi) instantly and accurately.
Conversion Formula
psi = cmHg × 0.1933677746
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 Pounds per Square Inch
One pound per square inch (psi) ≈ 6,894.76 Pa - the dominant pressure unit in US industry and consumer products. Car tyres: 32-36 psi; truck tyres 80-120 psi; bicycle road tyres 80-130 psi. Home water supply: 40-80 psi; residential maximum 80 psi per plumbing code. Compressed air tools: 90-150 psi. Steam autoclave sterilisation: 15-30 psi. The distinction between gauge (psig) and absolute (psia) pressure is critical: gauge pressure is relative to ambient; absolute = gauge + ~14.696 psi. 1 psi = 6,894.76 Pa.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Pounds per Square Inch (psi) |
|---|---|
| 1 cmHg | 0.193368 psi |
| 2 cmHg | 0.386736 psi |
| 5 cmHg | 0.966839 psi |
| 10 cmHg | 1.93368 psi |
| 25 cmHg | 4.83419 psi |
| 50 cmHg | 9.66839 psi |
| 100 cmHg | 19.3368 psi |