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Pressure

cmH₂OtoN/mm²

Convert centimetres of water column (cmH₂O) to newtons per square millimetre (N/mm²).

Factor1 cmH₂O = 9.80665e-5 N/mm²

Converter

cmH₂O

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

Result
9.80665N/mm²

Rendered to 6 significant figures.

Formula

Formula
N/mm² = cmH₂O × 9.80665e-5

Multiply any value in centimetres of water column by 9.80665e-5 to obtain the value in newtons per square millimetre.

Worked example

Convert 100000 cmH₂O to N/mm².

  1. 01Start with 100000 cmH₂O.
  2. 02Multiply by the conversion factor: 100000 × 9.80665e-5 = 9.80665 N/mm².
Result100000 cmH₂O = 9.80665 N/mm²

Conversion table

cmH₂ON/mm²
19.8067e-5
20.00019613
50.00049033
100.00098067
200.0019613
500.0049033
1000.0098067
2000.019613
5000.049033
10000.098067

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cmH₂O to N/mm²?
1 cmH₂O equals 9.80665e-5 N/mm². To convert, multiply the value in centimetres of water column by 9.80665e-5.
How do I convert 1 cmH₂O to N/mm²?
1 cmH₂O = 9.80665e-5 N/mm². For any value, multiply by 9.80665e-5.
How do I convert N/mm² back to cmH₂O?
Divide by the same factor — or equivalently, multiply by 10197.16. So 1 N/mm² = 10197.2 cmH₂O.
When would I need to convert centimetre of water column to newton per square millimetre?
Pressure conversions between cmH₂O 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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