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 How to Measure your Fragrance 
Copyright © Bitter Creek
Finally... measuring for Bath & Body products made easy!
We created this chart based on fragrance oils, but also applies to any other additives.

Chart Based on 1 oz per Gallon
(cut these amounts in half for products you only use 1/2 oz per gallon in)
Amount of
Bath Base
you are making
to add
in Ounces
on a
digital scale
Amount in 
Table Spoons
in Tea Spoons
in Drops
(Based on an
average of 23
drops per gram
or 115 drops
per teaspoon.)
1 Gallon
(128 oz.)
 add 1 oz. 1 2 Tbsp 6 tsp 29.57 28.35 652
1/2 Gallon
(64 oz.)
 add 1/2 oz. .5 1 Tbsp 3 tsp 14.79 14.17 326
32 oz.
(1 quart)
 add 1/4 oz. .25 1/2 Tbsp 1 1/2 tsp 7.39 7.09 163
16 oz.
(1 pound)
 add 1/8 oz. .125 1/4 Tbsp 3/4 tsp 3.7 3.54 81
8 oz.  add 1/16 oz. .0625 1/8 Tbsp 3/8 tsp 1.85 1.77 40
4 oz.
1/32 oz. .03125 1/16 Tbsp 3/16 tsp .925 .885 20
Want to figure out what percentage you're adding when you add an ounce to the gallon?
Take the amount of additive in ounces (1), + the amount of the base (128 oz.) = 129 total ounces.
Now take the additive (1 oz) divided by the total (129 oz) and you get = .00775
Take that number and multiply (x) 100, and that gives you the percentage of .775%,
which is a little over 3/4ths of a percent.

Note:  As long as you are adding only 1% or less of an additive (fragrance, soy oil, etc.),
it will not upset the blend or compromise the effectiveness of the preservatives.
Any ingredient with a content of under 1% can be listed on the product label at the bottom
and is not required to be in any specific order as long as they are listed under ingredients
that have contents higher than 1%.

.5 (1/2)% would be .645 ounces (a little over half an ounce)
1% would be 1.29 ounces (a little over an ounce and 1/4)

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