If you are one of those who make beautiful, long lasting soaps, this is not for you. I wrote this for people who might not realize the amount of water effects everything including the amount of oils and lye you use. If I have offended anybody I apologize and I readily admit that I have a lot to learn but I already know "Never to pour a whole bottle of salt in 30 oz of oil". I am so glad your reading this! Weight and type of fats and the superfat are NOT the only factors that determine the NaOH weight. " because it is what so many soapers don't realize which is also what stumped me because it is not taught - Especially from a bad program design of a soap calculator. (I know. I am a jobless programmer working in another field) This is where a soap calculator fails! You cannot see it but I can show you and give you background info. Follow me here, Get on your favorite soap calc. I used Wholesale supplies plus. Your scenario is "You only want 50 oz of Castille soap to fill your mold" CLick the radio button for NaOH of course Type in 37.1 oz of oil (I know this will make 50.01 oz @ .135 SAP Olive, Calc uses .131 probably. Close enough) Delete the "Water as % of Oils" Click on the "Water : Lye Ratio" radio button Type in "60:40" 5% SF and leave the rest blank no fragrance. (None of that matters anyways for this experiment) Double click Olive oil and make it 100% Make sure "Multiple tabs is selected" Click calculate Click "View or Print" Leave the tab it brought and go back to the original tab Leave everything the same but change the "Water : Lye Ratio" to 55:45 Click calculate Click "View or Print" Leave the tab it brought and go back to the original tab Leave everything the same but change the "Water : Lye Ratio" to 50:50 Leave those tabs up for now so I can explain something. I will start from the simple to more of a soaping point of view. First realize this - if you have a 16 oz cup and you wanted to fill it with 2 ingredients, whatever it may be, Ingredient 1 would be 8 oz and Ingredient 2 would be 8 oz. If you wanted to change those ingredients and still make 16 oz your next step would be Ingredient 1 changes to 7 oz and Ingredient 2 changes to 9 oz. to total 16. Next would be Ingredient 1 changes to 6 oz and Ingredient 2 changes to 10 oz for a total of 16 oz to fill the bottle. This relationship between Ingredient 1 and 2 depend on each other. When ever one changes the other changes to be able to get the same total oz. Now, lets make it a little more complicated. Lets put 3 ingredients in the bottle. Lets make 1 lye, 2 water, 3 oil. Each one of those depend on each other but much more intricate since it involves 3 values. This is actual numbers for this scenario to make 16 oz loaf Watch closely Water lye ratio 50:50 Olive oil: 358.62 gr (12.64 oz) Water: 47.45 gr (1.67 oz) Lye: 47.45 gr ( 1.67 oz.) Please keep in mind, ounces are not as accurate as grams when adding this. Results in 16 oz soap If I increase my water 4.69 grams I will now have a total of 16.16 oz of soap. I don't want that. I want 16 oz because that will waste soap. Besides that, how will I screw on my bottle cap? So something else will have to decrease. The only thing I have left to decrease is the oil. And if I decrease the oil, I will HAVE to decrease the lye! The new numbers will be Oil: 354.94 g (12.52 oz) Lye:46.96 g (1.66 oz) Water: 51.65 g (1.82 oz) Since I added more water, the oil in my recipe is now 354.94 gr (12.52 oz) which is less then the first scenario to make the same 16 oz of soap. This is also where the calc fails but going the opposite direction. Go back to those tabs that you pulled up separately so I can demonstrate where a calc fails please. If you look closely you will see a couple of things wrong and I'll point that out. The end result though means that the real difference between the 50:50 ratio and the last one at 60:40 should actually be 9 more grams of lye (which is significant because ((49.037 - 46.65) * .135) but yet it does not show the oil increasing or decreasing. It only shows your total oz. going up. Remember, in this scenario you only want a certain amount to stay constant. No matter what that may be. If you look through the tabs and add up all the weights (49.037 oz, 47.711 oz, 46.65 oz) You will see every thing, for some reason, stayed the same EXCEPT for your total amount. As you decreased (or increased) your water, your total weight ALSO went down. It went down to 46.65 oz and that is not what you wanted. You wanted 50oz. The only way to fix that is to go back to the original tab and increase your oil amount to 39.54 (which is 2.44 oz greater then originally which takes more lye.) So, you see, by adjusting the water your actually increasing or decreasing the amount of soap in the bar and possibly the loaf. Water does not turn into soap but it has everything to do with the amount of oil and lye that you use. Some people might think that controlling the water you do not effect the oil amount and lye amount but if you were patient I hope I showed this not to be the case. Hope this helps you. I really do. You will have more control and more soap in the same size bar.