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Pressure

mH₂OtoftH₂O

Convert metres of water column (mH₂O) to feet of water column (4 °C) (ftH₂O).

Factor1 mH₂O = 3.28084 ftH₂O

Converter

mH₂O

Accepts numbers or expressions, e.g. 150 + 14.7

Result
3.28084ftH₂O

Rendered to 6 significant figures.

Formula

Formula
ftH₂O = mH₂O × 3.28084

Multiply any value in metres of water column by 3.28084 to obtain the value in feet of water column (4 °C).

Worked example

Convert 1 mH₂O to ftH₂O.

  1. 01Start with 1 mH₂O.
  2. 02Multiply by the conversion factor: 1 × 3.28084 = 3.28084 ftH₂O.
Result1 mH₂O = 3.28084 ftH₂O

Conversion table

mH₂OftH₂O
13.2808
26.5617
516.404
1032.808
2065.617
50164.04
100328.08
200656.17
5001640.4
10003280.8

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mH₂O to ftH₂O?
1 mH₂O equals 3.28084 ftH₂O. To convert, multiply the value in metres of water column by 3.28084.
How do I convert 1 mH₂O to ftH₂O?
1 mH₂O = 3.28084 ftH₂O. For any value, multiply by 3.28084.
How do I convert ftH₂O back to mH₂O?
Divide by the same factor — or equivalently, multiply by 0.3048. So 1 ftH₂O = 0.3048 mH₂O.
When would I need to convert metre of water column to foot of water column (4 °C)?
Pressure conversions between mH₂O and ftH₂O 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).

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