Pressure
psitocmH₂O
Convert pounds-force per square inch (psi) to centimetres of water column (cmH₂O).
Factor1 psi = 70.30696 cmH₂O
Converter
psi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cmH₂O
Rendered to 6 significant figures.
Formula
Formula
cmH₂O = psi × 70.30696
Multiply any value in pounds-force per square inch by 70.30696 to obtain the value in centimetres of water column.
Worked example
Convert 1 psi to cmH₂O.
- 01Start with 1 psi.
- 02Multiply by the conversion factor: 1 × 70.30696 = 70.307 cmH₂O.
Result1 psi = 70.307 cmH₂O
Conversion table
| psi | cmH₂O |
|---|---|
| 1 | 70.307 |
| 2 | 140.61 |
| 5 | 351.53 |
| 10 | 703.07 |
| 20 | 1406.1 |
| 50 | 3515.3 |
| 100 | 7030.7 |
| 200 | 14061 |
| 500 | 35153 |
| 1000 | 70307 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from psi to cmH₂O?
1 psi equals 70.30696 cmH₂O. To convert, multiply the value in pounds-force per square inch by 70.30696.
How do I convert 1 psi to cmH₂O?
1 psi = 70.307 cmH₂O. For any value, multiply by 70.30696.
How do I convert cmH₂O back to psi?
Divide by the same factor — or equivalently, multiply by 0.01422334. So 1 cmH₂O = 0.0142233 psi.
When would I need to convert pound-force per square inch to centimetre of water column?
Pressure conversions between psi and cmH₂O 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).