The 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  



* 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*


We do have the mass to quantity calculator that can make this process easier. 

Use this article to assist you - Mass to Quantity Calculator



*** 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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