Pressure
cmH₂Otopsi
Convert centimetres of water column (cmH₂O) to pounds-force per square inch (psi).
Factor1 cmH₂O = 0.01422334 psi
Converter
cmH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psi
Rendered to 6 significant figures.
Formula
Formula
psi = cmH₂O × 0.01422334
Multiply any value in centimetres of water column by 0.01422334 to obtain the value in pounds-force per square inch.
Worked example
Convert 1000 cmH₂O to psi.
- 01Start with 1000 cmH₂O.
- 02Multiply by the conversion factor: 1000 × 0.01422334 = 14.2233 psi.
Result1000 cmH₂O = 14.2233 psi
Conversion table
| cmH₂O | psi |
|---|---|
| 1 | 0.014223 |
| 2 | 0.028447 |
| 5 | 0.071117 |
| 10 | 0.14223 |
| 20 | 0.28447 |
| 50 | 0.71117 |
| 100 | 1.4223 |
| 200 | 2.8447 |
| 500 | 7.1117 |
| 1000 | 14.223 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from cmH₂O to psi?
1 cmH₂O equals 0.01422334 psi. To convert, multiply the value in centimetres of water column by 0.01422334.
How do I convert 1 cmH₂O to psi?
1 cmH₂O = 0.0142233 psi. For any value, multiply by 0.01422334.
How do I convert psi back to cmH₂O?
Divide by the same factor — or equivalently, multiply by 70.30696. So 1 psi = 70.307 cmH₂O.
When would I need to convert centimetre of water column to pound-force per square inch?
Pressure conversions between cmH₂O and psi are common when working with mixed-vendor instrumentation, when piping codes use different units to process datasheets, or when converting field readings into SI for hydraulic calculations.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).