Pressure
mbartoftH₂O
Convert millibars (mbar) to feet of water column (4 °C) (ftH₂O).
Factor1 mbar = 0.03345526 ftH₂O
Converter
mbar
Accepts numbers or expressions, e.g. 150 + 14.7
Result
ftH₂O
Rendered to 6 significant figures.
Formula
Formula
ftH₂O = mbar × 0.03345526
Multiply any value in millibars by 0.03345526 to obtain the value in feet of water column (4 °C).
Worked example
Convert 100 mbar to ftH₂O.
- 01Start with 100 mbar.
- 02Multiply by the conversion factor: 100 × 0.03345526 = 3.34553 ftH₂O.
Result100 mbar = 3.34553 ftH₂O
Conversion table
| mbar | 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 mbar to ftH₂O?
1 mbar equals 0.03345526 ftH₂O. To convert, multiply the value in millibars by 0.03345526.
How do I convert 1 mbar to ftH₂O?
1 mbar = 0.0334553 ftH₂O. For any value, multiply by 0.03345526.
How do I convert ftH₂O back to mbar?
Divide by the same factor — or equivalently, multiply by 29.89067. So 1 ftH₂O = 29.8907 mbar.
When would I need to convert millibar to foot of water column (4 °C)?
Pressure conversions between mbar 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).