Most soapers actually use percentages, because then it doesn't matter whether one uses metric or imperial measurements (as long as you stay with weight, and not volume, lol). It also allows you to put those percentages into the soap calculator, and scale the batch size up and down as desired.Interesting calculation, thank you for sharing. I wish everyone would just use a single weight measurement (preferably grams) for everything. I did my own calculations are found that per 100g of water you add ~1.56g of both sea salt and baking soda. But I realize those things are all different densities so your idea might be better. I also assumed one quart of water is equal to 946.35g, not your 907g. I'm probably missing something lol.
I did ask the soap calculator developers if they would add "% of water" as one of the options for additives. So far that hasn't been added, but hopefully one day it will. Until then, I simply multiple my total weight of water by 1.7% and 1.9% to get the amount salt and bicarb needed for that specific batch size. That works whether you are using grams or ounces.
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