A frozen strawberry margarita from Red Lobster contains 350 calories per serving. A strawberry frozen margarita from Olive Garden contains 340 calories per serving. A Jose Cuervo Authentic Strawberry Margarita contains 440 calories in a 12-ounce serving.
The average margarita without ice contains 45 calories per ounce. Margarita glasses typically hold 8 to 16 ounces of liquid, or 360 to 720 calories. Less commonly, margaritas are served in low-ball glasses, which hold 4 to 9 ounces, or 180 to 405 calories worth of liquid.
A traditional margarita contains tequila, triple sec and lime juice or margarita mix. Eighty-proof tequila contains about 100 calories per 1.5-ounce shot. Triple sec contains about 110 calories per 1.5-ounce shot. Lime juice or margarita mix contains approximately 15 to 25 calories per ounce.