Gin contains 64 calories per ounce, or about 97 calories per 1.5-ounce shot. The diet tonic does not contribute any extra calories, as diet sodas are generally calorie free. Even adding a squirt of lemon or lime juice will not add a significant number of calories.Apr 24, 2015 read more
On average, the gin and tonic cocktail mix contains between 120 and 166 calories per serving. It must be noted, however, that most bars and bartenders in the United States use soda water instead of tonic water. read more