I assume you are referring to November's tool at http://foodsim.unclesalmon.com/.
Since November knows the assumptions and math he used to devise the tool, I will defer to his explanation of those factors. However, I believe he based his calculations on straight-sided measuring cups. And he used a default value of 2.243" (depth) for his 1-cup measuring cup. My 1-cup measuring cup is different from his. It is 1 3/4" deep. In addition to my straight-sided measuring cups, I also have a different set of measuring cups that are sloped with different top and bottom diameters. I may be wrong, but I don't think the tool is intended to be used with such measuring cups. But there is little doubt in my mind that there are many different types of measuring cups, and measuring spoons as well. Some measuring spoons aren't even round. Maybe in a laboratory somewhere there is such a thing as a "standard" set of measuring cups and spoons, but not in the home.
I think it would be highly irregular that one would only
have a 1/2-cup measuring cup to measure out quantities of flour. That's not to say that one won't get acceptable results, but the measurements will not be accurate. November's tool provides accuracy and is flexible enough to allow one to use the measuring cups and spoons on hand to convert weights of ingredients like flour (including the KASL) into volume measurements. In my case, for example, my set includes 1 cup, 1/2 c., 1/3 c., 1/4 c., 1 T, 1 t., plus lesser size measuring spoons. As long as I enter the correct cup depth as called for by the tool and select the measuring cups and spoons I have available to me (by checking/unchecking the boxes), the tool will convert weights into volumes using my specific set of measuring cups and spoons. If I got this wrong, I'm sure November will correct me. November's tool also accommodates several types and brands of flour. Different types of flours have different compaction dynamics and the tool takes those differences into account. It is an ingenious tool. So ingenious, in fact, that I think I threw husker3in4 off stride by asking for his measuring cup measurements. No doubt he thought I was loony.