Grams, cups, oz, parts

Another question! Please. Hear me out :) What's a part in a recipe? I see lots of formulas that ask for 1 part lavender oil 1 part lemon oil etc. Equal amounts of each? 


  • PerryPerry Administrator, Professional Chemist
    Well, assuming that they are using the terms consistently, a part just refers to an equivalent amount. Specifically, when talking about a liquid I would think it is a volume measurement.

    So, if you have 1 part lavender oil and 1 part lemon oil, you would figure it out like this.

    1.  Add up all the parts.  (1+1=2)
    2.  Figure out the % by dividing parts by the whole.

      Lemon oil = 1/2 = 50%
      Lavendar oil = 1/2 = 50%

    The % should equal 100%

    If, for example, it was 3 parts lavender oil and 1 part lemon oil the calculation would be this

    1+3 = 4 total

    Lavender oil = 3/4 = 75%
    Lemon oil  = 1/4 = 25%

    Formulating should be done in % and all the measurements should be made in mass (grams).  Cups, ounces, parts shouldn't be used.
  • Thanks, that makes sense to me now. a-ha moment :) 
  • PharmaPharma Member, Pharmacist
    With fragrances, parts may actually be a 'valid' measure. Regarding scent profile, relative amounts of the different EO matter. Total amount simply imparts more or less scent to the final product and that is up to the manufacturer's likings.
  • Thanks 😊 
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