Okay, here is my think. I'm wanting to use some grain and stuff in with my commercial feed, I'm mixing 3 to 4 bags and I know the metzer feed calculator is out there but I'm looking more for some that I can tell it I hag 50 lbs of 28% 50 lbs of 20% and 100lbs of 12% and it tell me a percentage.... is that out there? Ive been looking but not found anything. Edited to add: okay here is a miss understanding. I'm not asking what that mix gives me... I KNOW that I went through all sorts of cr....stuff to figure it out. I want to know if here is an app, or webpage or seething that can plug 4 or 5 or more amounts and %'s and have it give me the protien % instantly. No math by me required.