Conversion Calculator

"mg/m3 to ppm" or "ppm to mg/m3" UK version as per EH40/2005

The UK conversion equation is based on 20 ºC and 1 atmosphere:
X ppm   =   (Y mg/m3)(24.05526)/(molecular weight)
or
Y mg/m3   =   (X ppm)(molecular weight)/24.05526

Fill in either the "ppm" value (X) or the "mg/m3" value (Y) AND the molecular weight of the compound. Then press the "Calculate" button.
ppm:
mg/m3:
molecular weight:
      
ppm value
 mg/m3 value
 based on the molecular weight of
Remember to consider significant digits in your use of the answer.
UK Guidance for expressing ppm in mg/m3 is to use 1 significant figure for anything less than 0.1 mg/m3, 2 significant figures for anything between 0.1 and less than 100 mg/m3 and 3 significant figures for anything 100 mg/m3 or over.

Adapted by David M. Bloor of dmboh from JavaScript courtesy of Edward T. Bartosh, Jr., CIH, Health Risk Associates, Dixon, California. This script may be freely used as public domain software.