Recipe calorie calculator

l thought at one time that there was a recipe calculator where you added all the ingredients; 2 cans diced tomatoes, 15.5 oz., 1 medium onion, 1/2 cup panko bread crumbs, 2 Tbsp butter. You could then choose how many servings this would make and get the total number of calories per serving, but I can't figure out where to find it or has this changed? If so, can anyone recommend a site where I can find something like this?

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