Pressure
psftoinH₂O
Convert pounds-force per square foot (psf) to inches of water column (4 °C) (inH₂O).
Factor1 psf = 0.1922216 inH₂O
Converter
psf
Accepts numbers or expressions, e.g. 150 + 14.7
Result
inH₂O
Rendered to 6 significant figures.
Formula
Formula
inH₂O = psf × 0.1922216
Multiply any value in pounds-force per square foot by 0.1922216 to obtain the value in inches of water column (4 °C).
Worked example
Convert 100 psf to inH₂O.
- 01Start with 100 psf.
- 02Multiply by the conversion factor: 100 × 0.1922216 = 19.2222 inH₂O.
Result100 psf = 19.2222 inH₂O
Conversion table
| psf | inH₂O |
|---|---|
| 1 | 0.19222 |
| 2 | 0.38444 |
| 5 | 0.96111 |
| 10 | 1.9222 |
| 20 | 3.8444 |
| 50 | 9.6111 |
| 100 | 19.222 |
| 200 | 38.444 |
| 500 | 96.111 |
| 1000 | 192.22 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from psf to inH₂O?
1 psf equals 0.1922216 inH₂O. To convert, multiply the value in pounds-force per square foot by 0.1922216.
How do I convert 1 psf to inH₂O?
1 psf = 0.192222 inH₂O. For any value, multiply by 0.1922216.
How do I convert inH₂O back to psf?
Divide by the same factor — or equivalently, multiply by 5.20233. So 1 inH₂O = 5.20233 psf.
When would I need to convert pound-force per square foot to inch of water column (4 °C)?
Pressure conversions between psf and inH₂O 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).