How Many Calories Are in an In-N-Out 3x1 Protein Style?
                                
                                
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                                    5 min read                                
                            
                                Based on official In-N-Out nutritional information, a standard 1x1 Protein Style cheeseburger contains 270 calories, making the secret menu 3x1 a popular but much more calorie-dense choice. This high-protein, low-carb option is a favorite among dieters, but its custom nature requires careful calculation to determine the total caloric intake.