A white bread tuna fish sub with lettuce and tomato has 219 calories per 100 grams. Because the 6 inch sub weighs 237 grams, this means that the calorie count for this sandwich is 517 calories.
A 12 inch sub weighs 474 grams, so its calorie count is 1033 calories. Along with this, the sandwich has 12.33 grams of protein, 12.04 grams of fat, 15.95 grams of carbohydrates and 0.7 grams of dietary fiber. It is rich in sodium and has a fair amount of calcium, potassium and phosphorus. The vitamin count is rather paltry, with niacin being the most abundant vitamin at 7.727 milligrams per 100 grams of sandwich.