Conversion Calculator

"mg/m3 to ppm" or "ppm to mg/m3"

The conversion equation is based on 25 ºC and 1 atmosphere:
X ppm   =   (Y mg/m3)(24.45)/(molecular weight)
or
Y mg/m3   =   (X ppm)(molecular weight)/24.45

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.

To determine molecular weight, add the atomic weights of all atoms present in the chemical formula for a particular substance.

Periodic Table

(courtesy of Los Alamos National Laboratory).