How many calories are in a tonic?
                                
                                
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                                    5 min read                                
                            
                                According to the USDA, a standard 12-ounce serving of regular tonic water contains approximately 114 calories, primarily due to added sugars. Knowing how many calories are in a tonic is crucial for anyone monitoring their sugar intake or counting calories, especially when mixing cocktails like a gin and tonic.