I got this formula from our guild but will look who gave it. It was a chemist
oops is 0.55 not 0.44 for KOH I am sooo sorry DeeAnna like always is right ,
Glycerin calulations:
NaOH it is lye amount x 0.77 = glycerin e.g. 136g x 0.77 = 104.72 g of glycerin
KOH it is lye x 0.55 = glycerin amount
Here is the calculation in use and why from Scott:
1g NaOH gives 0.77g glycerine
1.4g KOH gives 0.77g glycerine
so 1g KOH gives you 0.55g glycerine
Quick explanation - it's the OH part of the alkali (lye) that "makes" glycerine in the saponification reaction - K atom is heavier than Na atom so you need more KOH (weight) than NaOH to provide the same amount of OH
When using NaOH, 1g of oil/fat gives 1 g soap salts
When using KOH, 1g of oil /fat gives 1.4g soap salts
Scott owns
http://www.cosmeticsafetyassessment.com/
There is link to follow. ........