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Pressure

ftH₂OtoN/mm²

Convert feet of water column (4 °C) (ftH₂O) to newtons per square millimetre (N/mm²).

Factor1 ftH₂O = 0.002989067 N/mm²

Converter

ftH₂O

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

Result
0.298907N/mm²

Rendered to 6 significant figures.

Formula

Formula
N/mm² = ftH₂O × 0.002989067

Multiply any value in feet of water column (4 °C) by 0.002989067 to obtain the value in newtons per square millimetre.

Worked example

Convert 100 ftH₂O to N/mm².

  1. 01Start with 100 ftH₂O.
  2. 02Multiply by the conversion factor: 100 × 0.002989067 = 0.298907 N/mm².
Result100 ftH₂O = 0.298907 N/mm²

Conversion table

ftH₂ON/mm²
10.0029891
20.0059781
50.014945
100.029891
200.059781
500.14945
1000.29891
2000.59781
5001.4945
10002.9891

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from ftH₂O to N/mm²?
1 ftH₂O equals 0.002989067 N/mm². To convert, multiply the value in feet of water column (4 °C) by 0.002989067.
How do I convert 1 ftH₂O to N/mm²?
1 ftH₂O = 0.00298907 N/mm². For any value, multiply by 0.002989067.
How do I convert N/mm² back to ftH₂O?
Divide by the same factor — or equivalently, multiply by 334.5526. So 1 N/mm² = 334.553 ftH₂O.
When would I need to convert foot of water column (4 °C) to newton per square millimetre?
Pressure conversions between ftH₂O and N/mm² 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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