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We regularly receive questions regarding weight vs. volume, so we hope that you will find these calculators to be useful. We always recommend measuring by weight, so as to be precise when formulating. For your convenience, we have included a "Volume Calculator" conversion, but we would like to explain why we recommend measuring by weight, not volume.

First, manufacturers determine the capacity of a container by volume, not weight and this means that water was used as the unit of measure. For instance, if you are using 1 cup to measure, it holds 8 oz of water. But, let's say you're working with something fluffy (like lavender buds). 1 cup will hold only 1 oz by weight, but 8 oz by volume. The difference may not be as dramatic in carrier oils, butters, fragrances, etc, but the varying densities in each ingredient causes notable differences between the weight & volume. Ultimately, measuring by volume can lead to inconsistent finished product from one batch to the next. It's much easier to increase or decrease your formula using weight measurements as well. Because our fragrances, flavor oils & carrier oils are measured by weight, you may notice that the fill levels vary. Again, this is due to the density & weight differences in each raw ingredient.

Remember the riddle "Which weighs more? A pound of feathers or a pound of bricks?" Of course, one doesn't weigh more than the other. A pound of bricks or a pound of feathers ways the exact same (1 pound). The pound of bricks is more dense than the pound of feathers, though.

Weight Conversion


Calculate how much fragrance, essential oil, or additive to add to base

  of base  x   % of additive  =  

Volume Calculator

fl oz
tsp (US)
Tbs (US)