Pressure
hPatoftH₂O
Convert hectopascals (hPa) to feet of water column (4 °C) (ftH₂O).
Factor1 hPa = 0.03345526 ftH₂O
Converter
hPa
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ftH₂O
Rendered to 6 significant figures.
Formula
Formula
ftH₂O = hPa × 0.03345526
Multiply any value in hectopascals by 0.03345526 to obtain the value in feet of water column (4 °C).
Worked example
Convert 1000 hPa to ftH₂O.
- 01Start with 1000 hPa.
- 02Multiply by the conversion factor: 1000 × 0.03345526 = 33.4553 ftH₂O.
Result1000 hPa = 33.4553 ftH₂O
Conversion table
| hPa | ftH₂O |
|---|---|
| 1 | 0.033455 |
| 2 | 0.066911 |
| 5 | 0.16728 |
| 10 | 0.33455 |
| 20 | 0.66911 |
| 50 | 1.6728 |
| 100 | 3.3455 |
| 200 | 6.6911 |
| 500 | 16.728 |
| 1000 | 33.455 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from hPa to ftH₂O?
1 hPa equals 0.03345526 ftH₂O. To convert, multiply the value in hectopascals by 0.03345526.
How do I convert 1 hPa to ftH₂O?
1 hPa = 0.0334553 ftH₂O. For any value, multiply by 0.03345526.
How do I convert ftH₂O back to hPa?
Divide by the same factor — or equivalently, multiply by 29.89067. So 1 ftH₂O = 29.8907 hPa.
When would I need to convert hectopascal to foot of water column (4 °C)?
Pressure conversions between hPa 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).