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Pressure

ftH₂OtocmH₂O

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

Factor1 ftH₂O = 30.48 cmH₂O

Converter

ftH₂O

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

Result
304.8cmH₂O

Rendered to 6 significant figures.

Formula

Formula
cmH₂O = ftH₂O × 30.48

Multiply any value in feet of water column (4 °C) by 30.48 to obtain the value in centimetres of water column.

Worked example

Convert 10 ftH₂O to cmH₂O.

  1. 01Start with 10 ftH₂O.
  2. 02Multiply by the conversion factor: 10 × 30.48 = 304.8 cmH₂O.
Result10 ftH₂O = 304.8 cmH₂O

Conversion table

ftH₂OcmH₂O
130.48
260.96
5152.4
10304.8
20609.6
501524
1003048
2006096
50015240
100030480

Reference values rounded to 5 significant figures for display.

FAQ

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

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