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Pressure

N/mm²toinH₂O

Convert newtons per square millimetre (N/mm²) to inches of water column (4 °C) (inH₂O).

Factor1 N/mm² = 4014.631 inH₂O

Converter

N/mm²

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

Result
4014.63inH₂O

Rendered to 6 significant figures.

Formula

Formula
inH₂O = N/mm² × 4014.631

Multiply any value in newtons per square millimetre by 4014.631 to obtain the value in inches of water column (4 °C).

Worked example

Convert 1 N/mm² to inH₂O.

  1. 01Start with 1 N/mm².
  2. 02Multiply by the conversion factor: 1 × 4014.631 = 4014.63 inH₂O.
Result1 N/mm² = 4014.63 inH₂O

Conversion table

N/mm²inH₂O
14014.6
28029.3
520073
1040146
2080293
502.0073e+5
1004.0146e+5
2008.0293e+5
5002.0073e+6
10004.0146e+6

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from N/mm² to inH₂O?
1 N/mm² equals 4014.631 inH₂O. To convert, multiply the value in newtons per square millimetre by 4014.631.
How do I convert 1 N/mm² to inH₂O?
1 N/mm² = 4014.63 inH₂O. For any value, multiply by 4014.631.
How do I convert inH₂O back to N/mm²?
Divide by the same factor — or equivalently, multiply by 0.0002490889. So 1 inH₂O = 0.000249089 N/mm².
When would I need to convert newton per square millimetre to inch of water column (4 °C)?
Pressure conversions between N/mm² and inH₂O 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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