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ppm to mg/m3 Conversion Calculator

  Input values below. (Disclaimer)
Enter either ppm or mg/m3 and the molecular weight then click the "Calculate" button
molecular weight:
Enter the molecular weight of the substance in the box above or select from the list below
Format: Chemical Name (CAS Registry Number)


ppm value:
mg/m3 value:
Based on molecular weight of: :

How it works

ppm = (mg/m3 value )(24.45)/(molecular weight)

mg/m3 = ( ppm value)(molecular weight)/24.45

24.45 is a conversion factor that represents the volume of one mole of gas.

To determine the molecular weight of a particular substance, add the atomic weights (look at the MSDS of the particular substance) of each atom present in the chemical formula of that particular substance

Note: this calculation assumes a temperature of 25°C (77°F) and a pressure of 1 atmosphere (760 torr or 760 mm Hg).



National Institute of Standards and Technology Periodic Table

National Institute of Standards and Technology Chemistry WebBook

American Chemical Society Chemical Abstracts Service (CAS) Registry

Disclaimer: Use this converter at your own risk. SKC Inc stives to ensure the acuracy of its data however SKC Inc makes no warranties to that effect, and SKC Inc shall not be liable for any damage that may result from use of this converter. For more information on our terms and conditions see





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