1 cup for 1 serving
A typical serving of pasta is 2 ounces of pasta and 1/4 cup of sauce. However, most Americans consume more than the standard size. I would double it to 4 ounces of pasta and 1/2 of sauce per serving. Therefore, I'd use 25 cups of sauce to feed 50 people, however, you may want to add another 5 cups just to be on the safe side.
I'd go with about 8-10 cups of onion per 48oz batch
That is a subjective answer, so in my opinion, I normally serve 2 cups of sauce per pound of pasta. or 30 cups (2 #10 cans, or just less than 2 gallons) for 15 lbs of pasta. Some use more sauce, some use less.
2 cups of cooked pasta is usually between 200 to 400 calories, depending on what kind of pasta(whole grain pasta 200) and a cup of spaghetti tomato sauce is around 330 calories which also varies.
I can of 28 oz. tomatoes will usually get you through a pound of pasta. Sometimes you will have a little leftover.
Make sure your pasta sauce is thick and the pasta is well drained. A good restaurant trick is to put several ladles of sauce into a large skillet and add just enough pasta for two people at a time. Heat sauce and pasta together shaking pan well to thoroughly coat the pasta.
In my opinion, if your serving along side other food, you should assume 1 serving per person. One serving of pasta is generally 1/4 a cup of dry pasta. Therefore you should cook 17.5 cups of dry pasta, for your pasta salad.
9 cups
Somewhere between 100 and 125 cups in 60 lbs of sauce
What that means is 3 cups of pasta measured after you have boiled it. It does NOT mean to measure it out THEN cook it.
According to the National Pasta Association , 8 ounces of uncooked long pasta, such as spaghetti will yield 4 cups of cooked pasta. Thus, a "serving" of 2 oz. uncooked spaghetti will be the nutritional equivalent of 1 cup of cooked spaghetti.
as a side dish 6people, as a main dish 4 people. When you cook 16oz. of pasta(2cups) this will double when cooked.