Pressure
kPatoinH₂O
Convert kilopascals (kPa) to inches of water column (4 °C) (inH₂O).
Factor1 kPa = 4.014631 inH₂O
Converter
kPa
Accepts numbers or expressions, e.g. 150 + 14.7
Result
inH₂O
Rendered to 6 significant figures.
Formula
Formula
inH₂O = kPa × 4.014631
Multiply any value in kilopascals by 4.014631 to obtain the value in inches of water column (4 °C).
Worked example
Convert 1 kPa to inH₂O.
- 01Start with 1 kPa.
- 02Multiply by the conversion factor: 1 × 4.014631 = 4.01463 inH₂O.
Result1 kPa = 4.01463 inH₂O
Conversion table
| kPa | inH₂O |
|---|---|
| 1 | 4.0146 |
| 2 | 8.0293 |
| 5 | 20.073 |
| 10 | 40.146 |
| 20 | 80.293 |
| 50 | 200.73 |
| 100 | 401.46 |
| 200 | 802.93 |
| 500 | 2007.3 |
| 1000 | 4014.6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from kPa to inH₂O?
1 kPa equals 4.014631 inH₂O. To convert, multiply the value in kilopascals by 4.014631.
How do I convert 1 kPa to inH₂O?
1 kPa = 4.01463 inH₂O. For any value, multiply by 4.014631.
How do I convert inH₂O back to kPa?
Divide by the same factor — or equivalently, multiply by 0.2490889. So 1 inH₂O = 0.249089 kPa.
When would I need to convert kilopascal to inch of water column (4 °C)?
Pressure conversions between kPa 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).