Pressure
psftocmH₂O
Convert pounds-force per square foot (psf) to centimetres of water column (cmH₂O).
Factor1 psf = 0.4882428 cmH₂O
Converter
psf
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cmH₂O
Rendered to 6 significant figures.
Formula
Formula
cmH₂O = psf × 0.4882428
Multiply any value in pounds-force per square foot by 0.4882428 to obtain the value in centimetres of water column.
Worked example
Convert 100 psf to cmH₂O.
- 01Start with 100 psf.
- 02Multiply by the conversion factor: 100 × 0.4882428 = 48.8243 cmH₂O.
Result100 psf = 48.8243 cmH₂O
Conversion table
| psf | cmH₂O |
|---|---|
| 1 | 0.48824 |
| 2 | 0.97649 |
| 5 | 2.4412 |
| 10 | 4.8824 |
| 20 | 9.7649 |
| 50 | 24.412 |
| 100 | 48.824 |
| 200 | 97.649 |
| 500 | 244.12 |
| 1000 | 488.24 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from psf to cmH₂O?
1 psf equals 0.4882428 cmH₂O. To convert, multiply the value in pounds-force per square foot by 0.4882428.
How do I convert 1 psf to cmH₂O?
1 psf = 0.488243 cmH₂O. For any value, multiply by 0.4882428.
How do I convert cmH₂O back to psf?
Divide by the same factor — or equivalently, multiply by 2.048161. So 1 cmH₂O = 2.04816 psf.
When would I need to convert pound-force per square foot to centimetre of water column?
Pressure conversions between psf 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).