Convert Centimeters of Water to Pounds per Square Inch
Convert Centimeters of Water (cmH₂O) to Pounds per Square Inch (psi) instantly and accurately.
Conversion Formula
psi = cmH₂O × 0.01422334331
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 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 Water (cmH₂O) | Pounds per Square Inch (psi) |
|---|---|
| 1 cmH₂O | 0.0142233 psi |
| 2 cmH₂O | 0.0284467 psi |
| 5 cmH₂O | 0.0711167 psi |
| 10 cmH₂O | 0.142233 psi |
| 25 cmH₂O | 0.355584 psi |
| 50 cmH₂O | 0.711167 psi |
| 100 cmH₂O | 1.42233 psi |