#### BrewerGeorge

##### Well-Known Member

I

*have*read the sticky thread fully and understand how to calculate the weight of oils for regular-shaped molds (though I am still a bit shaky on how to account for differing lye concentrations.) My uncertainty is around irregular molds. Since it would be relatively easy with the scale to find the volume of any mold by weighing it while filled with pure water, I think that is the best starting point for me personally and I'm hoping that someone can confirm my understanding from the sticky.

I believe that I should be able to find the total grams of oils needed to fill a given mold by multiplying its volume in ml by 0.7. Is this correct? If so, at what lye concentration is that correct?

Also, soapcalc gives a result titled, "Soap weight before CP cure or HP cook.' Is that number useful at all in accounting for differing lye concentrations?