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How do I convert ppm to mg/m3 and ppb to µg/m3?

The two formulae used are:

Unit conversion

For more information on calculating atmospheric concentrations, refer to Application Note 025.

 

Note that the ppm and ppb concentrations in these formulae are by volume, and the molar volume at 1 atm and 25°C is 24.45 L.

 



Conversion Calculator



To convert units based on 25°C and 1 atm, fill in the ppm value (or the mg/m3 value) and the molecular mass, and click “Calculate”.
ppm:
mg/m3:
molecular mass:
      

ppm value
mg/m3 value
based on the molecular mass of


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