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There are 64 calories in 1 fluid ounce of Vodka (90 Proof). Calorie breakdown: 0% fat, 0% carbs, 100% protein.
1 80-proof vodka (40% alcohol; the most common type) has 64 calories per 1oz. 2  86-proof vodka (43% alcohol) has 70 calories/1 oz. 3  90-proof vodka (45% alcohol) has 73 calories/1 oz.  100-proof vodka (50% alcohol) has 82 calories/1 oz.