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Pressure

inH₂OtoftH₂O

Convert inches of water column (4 °C) (inH₂O) to feet of water column (4 °C) (ftH₂O).

Factor1 inH₂O = 0.08333333 ftH₂O

Converter

inH₂O

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

Result
10ftH₂O

Rendered to 6 significant figures.

Formula

Formula
ftH₂O = inH₂O × 0.08333333

Multiply any value in inches of water column (4 °C) by 0.08333333 to obtain the value in feet of water column (4 °C).

Worked example

Convert 120 inH₂O to ftH₂O.

  1. 01Start with 120 inH₂O.
  2. 02Multiply by the conversion factor: 120 × 0.08333333 = 10 ftH₂O.
Result120 inH₂O = 10 ftH₂O

Conversion table

inH₂OftH₂O
10.083333
20.16667
50.41667
100.83333
201.6667
504.1667
1008.3333
20016.667
50041.667
100083.333

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from inH₂O to ftH₂O?
1 inH₂O equals 0.08333333 ftH₂O. To convert, multiply the value in inches of water column (4 °C) by 0.08333333.
How do I convert 1 inH₂O to ftH₂O?
1 inH₂O = 0.0833333 ftH₂O. For any value, multiply by 0.08333333.
How do I convert ftH₂O back to inH₂O?
Divide by the same factor — or equivalently, multiply by 12. So 1 ftH₂O = 12 inH₂O.
When would I need to convert inch of water column (4 °C) to foot of water column (4 °C)?
Pressure conversions between inH₂O 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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