My crockpot is standard-size, I guess (I have seen smaller ones and bigger ones). I did make a crockpot of chili for my son's football team dinner a few years ago, but now I don't recall how much chopped meat I used.
I want to make a full crock of it. It's for my son's wrestling tournament; his team is hosting it and we will be selling food.
When I make chili I use three pounds of meat, two 19 oz. cans of beans and four cans of diced tomatoes with jalepenos, several onions the size of softballs and that makes a crockpot full of chili that would feed a small army with rice or biscuits. I buy the big package of meat at BJs because it is cheaper per pound to buy the big package.
If you are worried about running out how about doing a "chili dump"? It is done around here frequently. Have several people each make a pot of chili, bring them together and dump them all into one big pot. You do not need to all use the same recipe. Just make what you usually make. It may sound strange but it always ends up tasting good!
3 pounds of hamburger, 3 cans of tomato sauce and/or diced tomatoes, and 3 cans of beans. Then I chop up about a 1/2 cup of onion and use two packages of chili seasoning. That's just about the right amount for my big crockpot.