How many calories in a 12 inch blt depends on ingredients and preparation
                                
                                
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                                    4 min read                                
                            
                                A 12-inch Subway footlong BLT with 9-Grain Wheat bread and regular mayo contains 950 calories, but restaurant and homemade versions can vary drastically. The ultimate answer to how many calories in a 12 inch blt is not a single number, but rather a wide range influenced by every ingredient choice, from the bread to the bacon to the spread.