Sweet spaghetti is heavier than it tastes because the sauce is half sugar. Banana ketchup, tomato sauce and added sugar make the sauce about 130 calories per 100g before the meat goes in. A solo serving gets around 120g of sauce with ground pork and hotdog slices, which is 230 calories. The 200g of cooked noodles is 280. FatSecret lists it at 560 per container, and a second listing for the Jolly Spaghetti at 610, so 560 to 610 is the range.
The protein is low for the calorie cost. About 15g in a solo serving, most of it from the hotdog and the sprinkle of cheese. Compare that to a 1-pc Chickenjoy with rice at 600 calories and 30g of protein. If you are choosing between the two for the same calories, the chicken meal keeps you full longer.
The combos are where it goes over 1,000. Chickenjoy with Jolly Spaghetti, which is the classic birthday plate, is about 860 calories. The family pan (about 1.2kg) is around 2,400, meant for 4 to 5 people but easily eaten by 3. At about 65 pesos for a solo it is cheap, and the sweetness means adults eat it fast and go back for the second serving at parties.