Pressure
PatoinH₂O
Convert pascals (Pa) to inches of water column (4 °C) (inH₂O).
Factor1 Pa = 0.004014631 inH₂O
Converter
Pa
Accepts numbers or expressions, e.g. 150 + 14.7
Result
inH₂O
Rendered to 6 significant figures.
Formula
Formula
inH₂O = Pa × 0.004014631
Multiply any value in pascals by 0.004014631 to obtain the value in inches of water column (4 °C).
Worked example
Convert 1000 Pa to inH₂O.
- 01Start with 1000 Pa.
- 02Multiply by the conversion factor: 1000 × 0.004014631 = 4.01463 inH₂O.
Result1000 Pa = 4.01463 inH₂O
Conversion table
| Pa | inH₂O |
|---|---|
| 1 | 0.0040146 |
| 2 | 0.0080293 |
| 5 | 0.020073 |
| 10 | 0.040146 |
| 20 | 0.080293 |
| 50 | 0.20073 |
| 100 | 0.40146 |
| 200 | 0.80293 |
| 500 | 2.0073 |
| 1000 | 4.0146 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Pa to inH₂O?
1 Pa equals 0.004014631 inH₂O. To convert, multiply the value in pascals by 0.004014631.
How do I convert 1 Pa to inH₂O?
1 Pa = 0.00401463 inH₂O. For any value, multiply by 0.004014631.
How do I convert inH₂O back to Pa?
Divide by the same factor — or equivalently, multiply by 249.0889. So 1 inH₂O = 249.089 Pa.
When would I need to convert pascal to inch of water column (4 °C)?
Pressure conversions between Pa 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).