Pressure
mH₂Otopsi
Convert metres of water column (mH₂O) to pounds-force per square inch (psi).
Factor1 mH₂O = 1.422334 psi
Converter
mH₂O
Accepts numbers or expressions, e.g. 150 + 14.7
Result
psi
Rendered to 6 significant figures.
Formula
Formula
psi = mH₂O × 1.422334
Multiply any value in metres of water column by 1.422334 to obtain the value in pounds-force per square inch.
Worked example
Convert 10 mH₂O to psi.
- 01Start with 10 mH₂O.
- 02Multiply by the conversion factor: 10 × 1.422334 = 14.2233 psi.
Result10 mH₂O = 14.2233 psi
Conversion table
| mH₂O | psi |
|---|---|
| 1 | 1.4223 |
| 2 | 2.8447 |
| 5 | 7.1117 |
| 10 | 14.223 |
| 20 | 28.447 |
| 50 | 71.117 |
| 100 | 142.23 |
| 200 | 284.47 |
| 500 | 711.17 |
| 1000 | 1422.3 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mH₂O to psi?
1 mH₂O equals 1.422334 psi. To convert, multiply the value in metres of water column by 1.422334.
How do I convert 1 mH₂O to psi?
1 mH₂O = 1.42233 psi. For any value, multiply by 1.422334.
How do I convert psi back to mH₂O?
Divide by the same factor — or equivalently, multiply by 0.7030696. So 1 psi = 0.70307 mH₂O.
When would I need to convert metre of water column to pound-force per square inch?
Pressure conversions between mH₂O and psi 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).