Convert Centimeters of Mercury to Centimeters of Water
Convert Centimeters of Mercury (cmHg) to Centimeters of Water (cmH₂O) instantly and accurately.
Conversion Formula
cmH₂O = cmHg × 13.5951
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 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.
Quick Reference Table
| Centimeters of Mercury (cmHg) | Centimeters of Water (cmH₂O) |
|---|---|
| 1 cmHg | 13.5951 cmH₂O |
| 2 cmHg | 27.1902 cmH₂O |
| 5 cmHg | 67.9755 cmH₂O |
| 10 cmHg | 135.951 cmH₂O |
| 25 cmHg | 339.877 cmH₂O |
| 50 cmHg | 679.755 cmH₂O |
| 100 cmHg | 1359.51 cmH₂O |