How many calories are in 1 cup of chopped white onion? A comprehensive nutritional guide
                                
                                
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                                    4 min read                                
                            
                                According to USDA data, a standard cup of chopped white onion contains approximately 64 calories. This versatile and low-calorie vegetable adds significant flavor and nutritional value to a wide variety of meals without substantially increasing your overall caloric intake.