How do I calculate combined percentages?
May 10, 2014 1:40 PM Subscribe
Mathfail: I'm considering supplementing my cat's food with plain meat. I'd like a rough idea of how much it would bump percentage of calories from protein and fat.
posted by moira to Science & Nature (6 answers total) 1 user marked this as a favorite
Here are the numbers I'm working from:
Total calories: 215
Canned food calories: 180
% calories from protein: 32%
% calories from fat: 59%
Meat calories: 35
% calories from protein: 77%
% calories from fat: 8.5%
If I combine these together, what are the combined calories from fat and protein?
I'm looking at a couple of canned foods, and would be grateful if you could walk me through the calculation. I feel dumb asking this - I'm sure I learned how to do this at some point in my life, but my math skills are rusty.
(For the curious: this is to compare numbers of cheaper food + meat to more expensive food.)