A standard 1.5-ounce (42 ml) shot of vodka at 80 proof (40% alcohol) contains approximately 96 to 97 calories. These calories come entirely from the alcohol content, as vodka contains no carbohydrates, fats, or proteins

. The calorie content varies with the proof (alcohol concentration):

• 70 proof (35% alcohol): about 85 calories
• 80 proof (40% alcohol): about 97 calories
• 90 proof (45% alcohol): about 110 calories
• 100 proof (50% alcohol): about 124 calories

For smaller or larger servings, the calories scale accordingly, for example, a 30 ml serving has around 67 calories, and a 25 ml single measure has about 55 calories

. In summary, vodka is relatively low in calories compared to many other alcoholic beverages, with roughly 96-97 calories per standard shot of 1.5 ounces at 80 proof.