Chemical Safety
Calculators
Time Weighted Average
Threshold Limit Values for Silica
TLV for Liquids
Minimum Sampling Volume
NIOSH PPM to mg/m3
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Conversion Calculator
"mg/m
3
to ppm" or "ppm to mg/m
3
"
The conversion equation is based on 25 ºC and 1 atmosphere:
X ppm = (Y mg/m
3
)(24.45)/(molecular weight)
or
Y mg/m
3
= (X ppm)(molecular weight)/24.45
Fill in either the "ppm" value (X) or the "mg/m
3
" value (Y) AND the molecular weight of the compound. Then press the "Calculate" button.
ppm:
mg/m
3
:
molecular weight:
ppm value
mg/m
3
value
based on the molecular weight of
