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Pressure

cmH₂OtoftH₂O

Convert centimetres of water column (cmH₂O) to feet of water column (4 °C) (ftH₂O).

Factor1 cmH₂O = 0.0328084 ftH₂O

Converter

cmH₂O

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

Result
3.28084ftH₂O

Rendered to 6 significant figures.

Formula

Formula
ftH₂O = cmH₂O × 0.0328084

Multiply any value in centimetres of water column by 0.0328084 to obtain the value in feet of water column (4 °C).

Worked example

Convert 100 cmH₂O to ftH₂O.

  1. 01Start with 100 cmH₂O.
  2. 02Multiply by the conversion factor: 100 × 0.0328084 = 3.28084 ftH₂O.
Result100 cmH₂O = 3.28084 ftH₂O

Conversion table

cmH₂OftH₂O
10.032808
20.065617
50.16404
100.32808
200.65617
501.6404
1003.2808
2006.5617
50016.404
100032.808

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cmH₂O to ftH₂O?
1 cmH₂O equals 0.0328084 ftH₂O. To convert, multiply the value in centimetres of water column by 0.0328084.
How do I convert 1 cmH₂O to ftH₂O?
1 cmH₂O = 0.0328084 ftH₂O. For any value, multiply by 0.0328084.
How do I convert ftH₂O back to cmH₂O?
Divide by the same factor — or equivalently, multiply by 30.48. So 1 ftH₂O = 30.48 cmH₂O.
When would I need to convert centimetre of water column to foot of water column (4 °C)?
Pressure conversions between cmH₂O 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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