Kirkland Signature Wine, Irish Country Cream: Calories, Nutrition ... Here's a simply way how to figure it out how many calories are in your wine: 1.) Multiply the serving size (in ounces) by the percentage of alcohol. 2.) Multiply the result by 1.6. Example: A 5 oz glass of wine with 12% alcohol will have 96 calories. 5 x 12 = 60. 60 x 1.6 = 96. Enjoy your wine (responsibly)!