How many calories are in a large slice of banana bread?
                                
                                
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                                    3 min read                                
                            
                                According to USDA data, a standard slice of banana bread has around 196-210 calories, but a large, bakery-style portion can easily contain 300 to over 400 calories. The answer to "How many calories are in a large slice of banana bread?" is highly dependent on the recipe and portion size, so the number can vary dramatically.