First, your avatar is almost annoying enough for me to not reply. Just sayin.
Second, you can do a two-stage starter for ramping up a big beer (either a big batch or a heavy beer). The idea is instead of having a big single starter, make a smaller starter run it to completion, cold crash it, decant off the wort, and follow up with a second starter.
1) fiddle with the OG and volume settings until you get a suggested starter size equal to whatever your first stage starter is (500 mL maybe?). Make sure the growth-factor slider is set all the way to the right so the calc doesn't tell you to use two vials.
2) Write down the target number of yeast cells (240 billion or whatever) that the calculator gives in (1).
3) Manually set the OG, volume of the calc to the actual brew you're making.
4) Manually set the viability percentage in the calc to whatever number you wrote down in (2). So if it claims you'll have 120 billion cells after your first stage, set the viability to 120%. That's the main trick here.
5) This new volume is the size of your second step, provided you ferment the first step nearly completely, crash cool, and decant off the liquid.
I've done this a few times, mainly for my big beers that require more than 1.5L in a 1-step starter, as I only have a 2L flask. Works pretty well so far.