Pressure
psftoftH₂O
Convert pounds-force per square foot (psf) to feet of water column (4 °C) (ftH₂O).
Factor1 psf = 0.01601846 ftH₂O
Converter
psf
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ftH₂O
Rendered to 6 significant figures.
Formula
Formula
ftH₂O = psf × 0.01601846
Multiply any value in pounds-force per square foot by 0.01601846 to obtain the value in feet of water column (4 °C).
Worked example
Convert 100 psf to ftH₂O.
- 01Start with 100 psf.
- 02Multiply by the conversion factor: 100 × 0.01601846 = 1.60185 ftH₂O.
Result100 psf = 1.60185 ftH₂O
Conversion table
| psf | ftH₂O |
|---|---|
| 1 | 0.016018 |
| 2 | 0.032037 |
| 5 | 0.080092 |
| 10 | 0.16018 |
| 20 | 0.32037 |
| 50 | 0.80092 |
| 100 | 1.6018 |
| 200 | 3.2037 |
| 500 | 8.0092 |
| 1000 | 16.018 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from psf to ftH₂O?
1 psf equals 0.01601846 ftH₂O. To convert, multiply the value in pounds-force per square foot by 0.01601846.
How do I convert 1 psf to ftH₂O?
1 psf = 0.0160185 ftH₂O. For any value, multiply by 0.01601846.
How do I convert ftH₂O back to psf?
Divide by the same factor — or equivalently, multiply by 62.42796. So 1 ftH₂O = 62.428 psf.
When would I need to convert pound-force per square foot to foot of water column (4 °C)?
Pressure conversions between psf and ftH₂O 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).