The number of calories in ribs varies, but there are approximately 90 calories in one small barbecued pork spare rib with sauce. There are approximately 900 calories in a half slab of St. Louis Style ribs from Famous Dave's BBQ Restaurant, which has six bones.
A half slab of ribs from Famous Dave's has about 58 grams of fat, 22 grams of saturated fat and 27 grams of carbohydrates. Famous Dave's citrus grilled naked ribs, which are served without sauce, have 690 calories with 40 grams of fat. Beef ribs are higher in calories and more popular in America than pork ribs.