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Pressure

mH₂OtoN/mm²

Convert metres of water column (mH₂O) to newtons per square millimetre (N/mm²).

Factor1 mH₂O = 0.00980665 N/mm²

Converter

mH₂O

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

Result
9.80665N/mm²

Rendered to 6 significant figures.

Formula

Formula
N/mm² = mH₂O × 0.00980665

Multiply any value in metres of water column by 0.00980665 to obtain the value in newtons per square millimetre.

Worked example

Convert 1000 mH₂O to N/mm².

  1. 01Start with 1000 mH₂O.
  2. 02Multiply by the conversion factor: 1000 × 0.00980665 = 9.80665 N/mm².
Result1000 mH₂O = 9.80665 N/mm²

Conversion table

mH₂ON/mm²
10.0098067
20.019613
50.049033
100.098067
200.19613
500.49033
1000.98067
2001.9613
5004.9033
10009.8066

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mH₂O to N/mm²?
1 mH₂O equals 0.00980665 N/mm². To convert, multiply the value in metres of water column by 0.00980665.
How do I convert 1 mH₂O to N/mm²?
1 mH₂O = 0.00980665 N/mm². For any value, multiply by 0.00980665.
How do I convert N/mm² back to mH₂O?
Divide by the same factor — or equivalently, multiply by 101.9716. So 1 N/mm² = 101.972 mH₂O.
When would I need to convert metre of water column to newton per square millimetre?
Pressure conversions between mH₂O 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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