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Pressure

cmH₂OtomH₂O

Convert centimetres of water column (cmH₂O) to metres of water column (mH₂O).

Factor1 cmH₂O = 0.01 mH₂O

Converter

cmH₂O

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

Result
1mH₂O

Rendered to 6 significant figures.

Formula

Formula
mH₂O = cmH₂O × 0.01

Multiply any value in centimetres of water column by 0.01 to obtain the value in metres of water column.

Worked example

Convert 100 cmH₂O to mH₂O.

  1. 01Start with 100 cmH₂O.
  2. 02Multiply by the conversion factor: 100 × 0.01 = 1 mH₂O.
Result100 cmH₂O = 1 mH₂O

Conversion table

cmH₂OmH₂O
10.01
20.02
50.05
100.1
200.2
500.5
1001
2002
5005
100010

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cmH₂O to mH₂O?
1 cmH₂O equals 0.01 mH₂O. To convert, multiply the value in centimetres of water column by 0.01.
How do I convert 1 cmH₂O to mH₂O?
1 cmH₂O = 0.01 mH₂O. For any value, multiply by 0.01.
How do I convert mH₂O back to cmH₂O?
Divide by the same factor — or equivalently, multiply by 100. So 1 mH₂O = 100 cmH₂O.
When would I need to convert centimetre of water column to metre of water column?
Pressure conversions between cmH₂O and mH₂O 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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