Pressure
psitoftH₂O
Convert pounds-force per square inch (psi) to feet of water column (4 °C) (ftH₂O).
Factor1 psi = 2.306659 ftH₂O
Converter
psi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ftH₂O
Rendered to 6 significant figures.
Formula
Formula
ftH₂O = psi × 2.306659
Multiply any value in pounds-force per square inch by 2.306659 to obtain the value in feet of water column (4 °C).
Worked example
Convert 50 psi to ftH₂O.
- 01Start with 50 psi.
- 02Multiply by the conversion factor: 50 × 2.306659 = 115.333 ftH₂O.
Result50 psi = 115.333 ftH₂O
Conversion table
| psi | ftH₂O |
|---|---|
| 1 | 2.3067 |
| 2 | 4.6133 |
| 5 | 11.533 |
| 10 | 23.067 |
| 20 | 46.133 |
| 50 | 115.33 |
| 100 | 230.67 |
| 200 | 461.33 |
| 500 | 1153.3 |
| 1000 | 2306.7 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from psi to ftH₂O?
1 psi equals 2.306659 ftH₂O. To convert, multiply the value in pounds-force per square inch by 2.306659.
How do I convert 1 psi to ftH₂O?
1 psi = 2.30666 ftH₂O. For any value, multiply by 2.306659.
How do I convert ftH₂O back to psi?
Divide by the same factor — or equivalently, multiply by 0.4335275. So 1 ftH₂O = 0.433528 psi.
When would I need to convert pound-force per square inch to foot of water column (4 °C)?
Pressure conversions between psi 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).