Frozen, fruit-flavored margaritas tend to have more calories because they contain some kind of fruit or juice, according to FitSugar.com. Keep alcohol intake moderate to prevent adverse health effects, such as accidental injury, cardiovascular disease or liver disease.
The margarita is a drink consisting of tequila, orange liqueur and lime juice. Some people substitute lemon juice for lime juice. The rim of the cocktail glass is dipped in salt. The drink is served either frozen or "on the rocks," with ice.
A 12 oz. margarita on the rocks has about 250 calories, while a frozen flavored margarita will have about 320 calories, according to the MyFitnessPal website.
If you want a low-calorie margarita, make it yourself. The Margarita Texas website recommends combining one tub of powdered lemon-lime drink mix, 2 cups water, the juice of one lime, 8 oz. tequila, 6 oz. orange liqueur and 4 oz. of brandy in a blender and mixing. Serves 4, on the rocks with a lime wedge.