A mass to quantity ratio is the weight of one unit (mls/tablets/capsules)


  • The quantity to mass conversion will only be shown if a container is being tracked by weight
  • For a substance denser than water - you will need to do a conversion ratio calculation
    1. First weigh your container (in grams) - This is a pre weight
    2. Second, withdraw 10mls of the substance
    3. Then weigh the container again (in grams) - This is a post weight
    4. Place the substance back into the container
    5. Calculate the conversion ratio as follows:
      • Step 1:

        (pre weight) - (post weight) = (difference)


      • Step 2: 

        (quantity drawn) / (difference)   = the weight of 1ml (mass to quantity conversion)


        Example: Pre weight =152.60 grams, post weight = 141.60 grams

                                                   Ratio = 10 divided by 11 (11 gram difference between pre and post weight)

                                                   Ratio = 0.9 - This would be the conversion ratio you enter in



* Having the correct conversion rate is important to ensure you do not have inaccurate weights of containers when they are finished and empty. Also, do not forget to account for hub loss once a container is physically empty*



*** Keep in mind that while tracking by weight is good backup measure, it is most important to ensure your quantity of volume used (mLs) is accurate in your log to ensure DEA compliance***





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