Convert Centimeters of Water to Centimeters of Mercury
Convert Centimeters of Water (cmH₂O) to Centimeters of Mercury (cmHg) instantly and accurately.
Conversion Formula
cmHg = cmH₂O × 0.07355591353
About Centimeters of Water
One centimetre of water column (cmH₂O) ≈ 98.07 Pa - the clinical pressure unit for respiratory and intravascular measurements. Mechanical ventilator settings are in cmH₂O: peak inspiratory pressure (PIP) 15-30 cmH₂O; PEEP 5-15 cmH₂O; plateau pressure should stay below 30 cmH₂O to avoid lung injury. Lumbar puncture CSF opening pressure is normally 8-20 cmH₂O. CPAP/BiPAP therapy for sleep apnea: 4-20 cmH₂O. Central venous pressure is also reported in cmH₂O. 1 cmH₂O = 98.0665 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
| Centimeters of Water (cmH₂O) | Centimeters of Mercury (cmHg) |
|---|---|
| 1 cmH₂O | 0.0735559 cmHg |
| 2 cmH₂O | 0.147112 cmHg |
| 5 cmH₂O | 0.36778 cmHg |
| 10 cmH₂O | 0.735559 cmHg |
| 25 cmH₂O | 1.8389 cmHg |
| 50 cmH₂O | 3.6778 cmHg |
| 100 cmH₂O | 7.35559 cmHg |