Pressure
inHgtocmH₂O
Convert inches of mercury (0 °C) (inHg) to centimetres of water column (cmH₂O).
Factor1 inHg = 34.53156 cmH₂O
Converter
inHg
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cmH₂O
Rendered to 6 significant figures.
Formula
Formula
cmH₂O = inHg × 34.53156
Multiply any value in inches of mercury (0 °C) by 34.53156 to obtain the value in centimetres of water column.
Worked example
Convert 10 inHg to cmH₂O.
- 01Start with 10 inHg.
- 02Multiply by the conversion factor: 10 × 34.53156 = 345.316 cmH₂O.
Result10 inHg = 345.316 cmH₂O
Conversion table
| inHg | cmH₂O |
|---|---|
| 1 | 34.532 |
| 2 | 69.063 |
| 5 | 172.66 |
| 10 | 345.32 |
| 20 | 690.63 |
| 50 | 1726.6 |
| 100 | 3453.2 |
| 200 | 6906.3 |
| 500 | 17266 |
| 1000 | 34532 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from inHg to cmH₂O?
1 inHg equals 34.53156 cmH₂O. To convert, multiply the value in inches of mercury (0 °C) by 34.53156.
How do I convert 1 inHg to cmH₂O?
1 inHg = 34.5316 cmH₂O. For any value, multiply by 34.53156.
How do I convert cmH₂O back to inHg?
Divide by the same factor — or equivalently, multiply by 0.02895902. So 1 cmH₂O = 0.028959 inHg.
When would I need to convert inch of mercury (0 °C) to centimetre of water column?
Pressure conversions between inHg and cmH₂O 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).