Convert Feet of Water to Centimeters of Water
Convert Feet of Water (ftH₂O) to Centimeters of Water (cmH₂O) instantly and accurately.
Conversion Formula
cmH₂O = ftH₂O × 30.48
About Feet of Water
One foot of water column (ftH₂O) ≈ 2,989 Pa - the US customary equivalent of cmH₂O used in civil and hydraulic engineering. Municipal water supply systems are designed for 40-80 psi head ≈ 92-184 ft; fire suppression sprinkler systems require minimum 7 psi ≈ 16 ft. Well pump specifications, sump pump head ratings, irrigation mainline pressure, and drainage calculations all use feet of head. 1 ft of water = 12 in WC = 0.4335 psi ≈ 2,989 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
| Feet of Water (ftH₂O) | Centimeters of Water (cmH₂O) |
|---|---|
| 1 ftH₂O | 30.48 cmH₂O |
| 2 ftH₂O | 60.96 cmH₂O |
| 5 ftH₂O | 152.4 cmH₂O |
| 10 ftH₂O | 304.8 cmH₂O |
| 25 ftH₂O | 762 cmH₂O |
| 50 ftH₂O | 1524 cmH₂O |
| 100 ftH₂O | 3048 cmH₂O |