Nutrition data and methodology
This page uses USDA SR Legacy FoodData Central record 174818, Alcoholic beverage, distilled, vodka, 80 proof: 231 kcal per 100 g and zero protein, carbohydrate, fat and fiber. The USDA-derived University Hospitals tables report 97.02 kcal per 1.5 fl oz serving and 64.22 kcal per 1 fl oz serving, matching the 42 g and 27.8 g weight references.
All displayed portions use per-100-g values multiplied by serving weight and divided by 100. Calories are rounded to whole kcal. The result is a reference for unsweetened 40% ABV vodka, not every drink sold as vodka.