Please help me figure out the calories home made chili

Here's what I've come up with. Tell me if this makes sense:
I'm making a serving size = 1 cup
I used 3 cans light red kidney beans
The lable says serving size =1/2 cup, 3.5 servings per can so I used about .5 cups x 3.5 x 3 cans = 5.25 cups. Calories per serving =100 so 100 x 3.5 x 3 cans = 1050 calories
so:
Beans = 5.25 cups, 1050 calories

same formula for stewed tomatoes but only 35 cal per serving so:

Tomatoes = 5.25 cups, 367.5 calories

I also used 1lb of 97/3 ground beef. serving size is 4 oz, calories per serving is 130 and cooked, I'm not sure how much volume it was. (any ideas how many cups a lb of ground beef is?) I'm gonna just use 2 cups as an estimate.

Beef = 2 cups, 520 calories

Onion = .5 cups, 40 calories

Then what I did is add up all the cups which = 13, then add all the calories which = 1977.5

I'm going to cook it for several hours uncovered so I'm guessing about a cup of water is going to evaporate so I'm subtracting that from the total cups, so now the total is 12 cups and 1977.5 calories. Divide 1977.5 by 12 and I have about 165 calories per 1 cup serving.

Does my math check out? My reasoning? I know it's not exact because the serving sizes in the beans and tomatoes arent exact, etc, but is this about right, ya think? Should I just measure for volume once its finished?

Thanks for the help!
-niki

Why don't you just plug it into the recipe analyzer?

That's what I do. :)

because the recipe analyzer never seems to be able to find the ingredients that I use.

you have to kind of trial and error some of the ingredients. Everything above is in the catalogue, however.

I went ahead and measured it out of the pot and it cooked down to about 8 cups so I'm glad I measured! That works out to about 247 calories per cup. Not too bad since it's full of protien and quite satisfying!