How many calories are in 1 tablespoon diced red onion?
                                
                                
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                                    4 min read                                
                            
                                According to the USDA, a standard tablespoon of chopped raw onion contains roughly 4.2 calories, making it an incredibly low-calorie ingredient. The exact number of calories in 1 tablespoon diced red onion can vary slightly depending on the size and moisture content, but it is consistently very minimal. This means you can add a flavorful crunch to your meals without worrying about your calorie intake.