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There are 64 calories in 1 fluid ounce of Vodka (90 Proof). Calorie breakdown: 0% fat, 0% carbs, 100% protein.
On average, 100 proof vodka (50% alcohol) has 130 calories per shot (1.5 ounces). This is approximately 85 calories per ounce. The greater the vodka proof (alcohol content), the more calories per ounce. For an easy way to estimate the number of calories per ounce of vodka, subtract 15 from the vodka proof.