The number of calories in a stromboli depends on which ingredients are used, ranging up to 890 calories. One stromboli usually contains many fat calories. For example, pepperoni stromboli can contain a minimum of 396 fat calories. This count is based on a stromboli of 300 grams.
A stromboli is a turnover filled with cheese and other ingredients of choice, such as pepperoni, ham, salami, bresaola and vegetables. It's very similar to a calzone since they both use Italian bread dough. The difference is that the stromboli is rolled up. To keep the calorie intake low, it's best to make stromboli with a low calorie cheese, low carbohydrate dough and vegetables.