When I started making soap, my internet connection was somewhat unstable at times. I was afraid that I might be stranded offline without a soap calculator the next time I planned a new soap. So I made my own offline Excel soap calculator with the saponification values gathered from different free online calculators.
In the picture below you can see how the amount of sodium hydroxide is calculated for a given percentage of superfatting (oh well, I guess it's too small, you'll have to click on the picture to enlarge it).
The offline soap calculator has the added advantage of acting as a file for my recipes:
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