A 1-cup serving of spaghetti with meat sauce and meatballs, spaghetti with meat sauce or spaghetti with tomato sauce and meatballs is estimated to be 323 calories. This can fluctuate depending on the brand of sauce used and the type of wheat or flour that the noodles are made from.
The best way to save calories on a plate of spaghetti is to swap the pasta noodles for spaghetti squash instead. A 1-cup portion of spaghetti squash is 42 calories, while a 1-cup portion of regular pasta is 221 calories. That small change will take a 1-cup serving of spaghetti from 323 calories to 144 calories.