OK, I think I've got this one, dummy as I am in this area still. NP and MP, PLEASE correct any part of this where I'm incorrect so that I can learn as well.
Water/liquids - You have a RANGE to work within. The reason for this is that some people discount the water to have less water to evaporate, therefore less TIME til the soap is ready. Some, like NP use the maximum because it pours better and allows for you to do fun swirling or just to allow for more room for error. Some SAP calculators ask you to start with the percentage of water then work from there. This one just provides you a range to work within and allows you to make your best judgment. So far, since I'm not swirling, I'm aiming at a range between mid- to max since I need mine done within the next 4 weeks. After this Christmas rush, I'm going to go more toward NP's max level and play around further.
Oils - Each of these provide something to the soap. Do you have the
TSC book? If so, see page 96. There's a chart there that'll tell you what each oil contributes to the soap - hardness, cleansing, various kinds of lather, conditioning, and quick trace.
TSC also details this further in the following pages and recommends percentages for some of these oils. You can play with this some to make a soap that will work for what you're trying to accomplish.
If you don't have
TSC, this online source is pretty good:
http://www.soap-making-resource.com/soap-making-ingredients.html
Lye - This is dependent on the oils. Each oil has a different level of saponification. If you increase or decrease the amounts of one oil or another, the saponification level changes. This is why you run your recipe through the calculator to determine which amount of lye you need.
Along the lines with this, the MMS calculator gives you a CHART to determine which amount of lye you want to use depending on your level of
superfatting. Again, this is a range, and these are the numbers you're seeing on the right side. Some soapers prefer more excess fat, others less. Newbies like you and I are still working this one out. Most likely we've been using homemade soaps without knowing at what level they're superfatted. Until we get to try our own stuff and know what we did to it, we're going to be a bit lost. As for me, I've been aiming for the 7% - 8% range. It gives me a little room to make some mistakes, but not too much. After trying my soap when it's done, I may play with this further. In the meantime, I've been running it through two calculators, MMS and the one at Soapers Choice. SC wants more detailed information up front and asks you what percentage of water/liquid you want to use. I've been aiming for 37% because that's what
TSC is doing for her basic recipe. So, I use that info from the one site to give me a guideline (since otherwise I wouldn't know what to do) and the rest of the info from MMS. Each time, what SC has given for my 37% is within the range found at MMS. I know that's probably more detailed than either MP or NP would do, but until I've figured out exactly what I'm doing, I figure the more questions I ask, the better it is.
I appreciate all your questions. Each time you ask one, I learn something new as well!