How Many Calories in a 6 Inch BLT Sub?
                                
                                
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                                    4 min read                                
                            
                                The average 6 inch BLT sub from a chain like Subway contains around 303 to 320 calories, but this number can change dramatically based on customization. The total calorie count for a 6 inch BLT sub is heavily dependent on the choice of bread, the amount of mayonnaise used, and any added cheese or extra ingredients.