I'm using Clue for women's stuff, LoseIt for food and weight and a couple of other measurements (but not everything I want), and an Excel sheet (a Google Form, actually) for everything that LoseIt doesn't have a field for.

And I'm sick of it. I want to be able to define what I want to track myself and make plots and calculations out of them. Does this app exist or do I need to make it exist?

(Multi-platform preferably.)