A distilled spirit, Ketel One vodka contains significantly fewer calories per serving than most beers or sweet liqueurs. However, a serving of vodka is a single shot of just 1 to 1.5 ounces. Calories can add up quickly if you pour with a heavy hand or consume a martini-sized drink, so stick with just one or two shots to avoid splurging on calories.
Ketel One vodka is 80 proof, meaning it contains 40 percent alcohol. All unflavored vodkas of this proof contain 64 calories per ounce, and a large shot of 1.5 ounces would contain 96 calories. Adding mixers such as orange or cranberry juice will increase the calorie content of your vodka drink, so mix with club soda and a splash of fresh lime juice to keep your beverage on the light side.