Pressure
inH₂Otopsf
Convert inches of water column (4 °C) (inH₂O) to pounds-force per square foot (psf).
Factor1 inH₂O = 5.20233 psf
Converter
inH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psf
Rendered to 6 significant figures.
Formula
Formula
psf = inH₂O × 5.20233
Multiply any value in inches of water column (4 °C) by 5.20233 to obtain the value in pounds-force per square foot.
Worked example
Convert 10 inH₂O to psf.
- 01Start with 10 inH₂O.
- 02Multiply by the conversion factor: 10 × 5.20233 = 52.0233 psf.
Result10 inH₂O = 52.0233 psf
Conversion table
| inH₂O | psf |
|---|---|
| 1 | 5.2023 |
| 2 | 10.405 |
| 5 | 26.012 |
| 10 | 52.023 |
| 20 | 104.05 |
| 50 | 260.12 |
| 100 | 520.23 |
| 200 | 1040.5 |
| 500 | 2601.2 |
| 1000 | 5202.3 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inH₂O to psf?
1 inH₂O equals 5.20233 psf. To convert, multiply the value in inches of water column (4 °C) by 5.20233.
How do I convert 1 inH₂O to psf?
1 inH₂O = 5.20233 psf. For any value, multiply by 5.20233.
How do I convert psf back to inH₂O?
Divide by the same factor — or equivalently, multiply by 0.1922216. So 1 psf = 0.192222 inH₂O.
When would I need to convert inch of water column (4 °C) to pound-force per square foot?
Pressure conversions between inH₂O and psf 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).