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Pressure

ftH₂OtomH₂O

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

Factor1 ftH₂O = 0.3048 mH₂O

Converter

ftH₂O

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

Result
3.048mH₂O

Rendered to 6 significant figures.

Formula

Formula
mH₂O = ftH₂O × 0.3048

Multiply any value in feet of water column (4 °C) by 0.3048 to obtain the value in metres of water column.

Worked example

Convert 10 ftH₂O to mH₂O.

  1. 01Start with 10 ftH₂O.
  2. 02Multiply by the conversion factor: 10 × 0.3048 = 3.048 mH₂O.
Result10 ftH₂O = 3.048 mH₂O

Conversion table

ftH₂OmH₂O
10.3048
20.6096
51.524
103.048
206.096
5015.24
10030.48
20060.96
500152.4
1000304.8

Reference values rounded to 5 significant figures for display.

FAQ

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