Pressure
inH₂OtoPa
Convert inches of water column (4 °C) (inH₂O) to pascals (Pa).
Factor1 inH₂O = 249.0889 Pa
Converter
inH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
Pa
Rendered to 6 significant figures.
Formula
Formula
Pa = inH₂O × 249.0889
Multiply any value in inches of water column (4 °C) by 249.0889 to obtain the value in pascals.
Worked example
Convert 10 inH₂O to Pa.
- 01Start with 10 inH₂O.
- 02Multiply by the conversion factor: 10 × 249.0889 = 2490.89 Pa.
Result10 inH₂O = 2490.89 Pa
Conversion table
| inH₂O | Pa |
|---|---|
| 1 | 249.09 |
| 2 | 498.18 |
| 5 | 1245.4 |
| 10 | 2490.9 |
| 20 | 4981.8 |
| 50 | 12454 |
| 100 | 24909 |
| 200 | 49818 |
| 500 | 1.2454e+5 |
| 1000 | 2.4909e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inH₂O to Pa?
1 inH₂O equals 249.0889 Pa. To convert, multiply the value in inches of water column (4 °C) by 249.0889.
How do I convert 1 inH₂O to Pa?
1 inH₂O = 249.089 Pa. For any value, multiply by 249.0889.
How do I convert Pa back to inH₂O?
Divide by the same factor — or equivalently, multiply by 0.004014631. So 1 Pa = 0.00401463 inH₂O.
When would I need to convert inch of water column (4 °C) to pascal?
Pressure conversions between inH₂O and Pa 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).