Pressure
bartoinH₂O
Convert bar (bar) to inches of water column (4 °C) (inH₂O).
Factor1 bar = 401.4631 inH₂O
Converter
bar
Accepts numbers or expressions, e.g. 150 + 14.7
Result
inH₂O
Rendered to 6 significant figures.
Formula
Formula
inH₂O = bar × 401.4631
Multiply any value in bar by 401.4631 to obtain the value in inches of water column (4 °C).
Worked example
Convert 1 bar to inH₂O.
- 01Start with 1 bar.
- 02Multiply by the conversion factor: 1 × 401.4631 = 401.463 inH₂O.
Result1 bar = 401.463 inH₂O
Conversion table
| bar | inH₂O |
|---|---|
| 1 | 401.46 |
| 2 | 802.93 |
| 5 | 2007.3 |
| 10 | 4014.6 |
| 20 | 8029.3 |
| 50 | 20073 |
| 100 | 40146 |
| 200 | 80293 |
| 500 | 2.0073e+5 |
| 1000 | 4.0146e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from bar to inH₂O?
1 bar equals 401.4631 inH₂O. To convert, multiply the value in bar by 401.4631.
How do I convert 1 bar to inH₂O?
1 bar = 401.463 inH₂O. For any value, multiply by 401.4631.
How do I convert inH₂O back to bar?
Divide by the same factor — or equivalently, multiply by 0.002490889. So 1 inH₂O = 0.00249089 bar.
When would I need to convert bar to inch of water column (4 °C)?
Pressure conversions between bar and inH₂O 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).