Vodka is often considered a 'clean' drink because it has zero carbs and zero sugar, but it is definitely not calorie-free. The calories in a vodka drink come almost entirely from the alcohol itself: pure ethanol supplies about 7 kcal per gram. This vodka calories per slice calculator turns that simple fact into a quick, practical estimate for any serving size, ABV, and number of drinks.
The word 'slice' here means one serving, generally a standard 1.5 oz shot. A typical 80-proof (40% ABV) vodka shot delivers about 97 kcal before any mixer is added. If you pour doubles, mix with juice or regular soda, or use higher-proof brands, the total climbs quickly. This tool helps you see exactly where those calories come from and plan your drink more intentionally.
🍸 Vodka Calories Per Slice
Estimate the calories in your vodka serving — one “slice” = one serving.
Step-by-step breakdown
How to Use This Tool
This calculator is designed for anyone who wants a quick, evidence-based estimate of the calories in vodka without breaking out a spreadsheet. Start by entering the volume of one serving in the box labeled Serving size, then choose the unit that matches your pour: fluid ounces (fl oz), milliliters (mL), or shots (where one shot equals 1.5 fl oz). If you usually pour from a bottle labeled by proof rather than ABV, use the quick buttons below the alcohol field to set the correct value automatically — for example, choosing 80 proof sets the ABV to 40 percent.
Next, enter how many servings you plan to drink. If you add a non-zero amount of mixer calories, the calculator includes that amount for every serving. Once you click Calculate, the result area shows four key numbers: calories per serving, total calories across all servings, alcohol by weight per serving, and the ABV you entered. A step-by-step breakdown underneath shows exactly how the numbers were derived, so you can double-check the math or adjust your inputs.
The Formula Behind Vodka Calories
The calorie content of plain vodka is almost entirely a function of its ethanol content. Ethanol has an energy density of roughly 7 kilocalories per gram, and pure alcohol weighs about 0.789 grams per milliliter at room temperature. Therefore, the calories from alcohol in any vodka serving can be written as:
To convert fluid ounces to milliliters, multiply by 29.5735. For example, one standard US shot is 1.5 fl oz, which equals 44.36 mL. If that shot is 40% ABV, the ethanol mass is 44.36 × 0.40 × 0.789 ≈ 14.0 g, and the alcohol calories are 14.0 × 7 ≈ 98 kcal. This aligns with the commonly quoted figure of around 97–100 kcal for an 80-proof shot. The same formula works for any serving size and ABV, making it useful for everything from a tiny sample to a large cocktail pour.
Worked Examples
Example 1: Standard shot. 1.5 fl oz of 80-proof vodka (40% ABV), no mixer. Volume = 44.36 mL; ethanol = 44.36 × 0.40 × 0.789 = 14.0 g; calories = 14.0 × 7 ≈ 98 kcal.
Example 2: Double high-proof pour. 3 fl oz of 100-proof vodka (50% ABV). Volume = 88.72 mL; ethanol = 88.72 × 0.50 × 0.789 ≈ 35.0 g; calories ≈ 245 kcal before mixers.
Example 3: Single with tonic. 1.5 fl oz of 80-proof vodka plus a 4 fl oz tonic mixer containing roughly 40 kcal. Alcohol calories = 98 kcal; mixer = 40 kcal; total = 138 kcal for one drink.
Factors That Affect Your Real Total
The formula above estimates calories from alcohol alone, which is accurate for unflavored vodka. Several real-world factors can push the actual total higher or lower:
- Proof and ABV. A higher-proof vodka contains more ethanol per ounce, so a 100-proof pour has roughly 25% more calories than an 80-proof pour at the same volume. The quick preset buttons make it easy to compare.
- Pour size. Home pours are often larger than the standard 1.5 oz shot. A heavy-handed 2 oz pour raises calories by about one-third compared with a standard shot.
- Mixers. Juice, regular soda, tonic, and sweet syrups add significant calories that do not come from alcohol. Tonic water, for example, is not calorie-free even though it looks like sparkling water.
- Flavored vodkas. Some flavored products contain added sugar or syrup. The calculator assumes pure vodka, so it may underestimate a sweetened product by a few calories per serving.
Standard Serving Reference
The table below shows alcohol-only calories for common vodka servings, using the US fluid ounce and the standard alcohol density values. Values are rounded to the nearest whole calorie.
| Vodka type | Volume | ABV | Calories (alcohol only) |
|---|---|---|---|
| 80 proof | 1 fl oz | 40% | 65 kcal |
| 80 proof | 1.5 fl oz shot | 40% | 98 kcal |
| 100 proof | 1.5 fl oz shot | 50% | 123 kcal |
| 120 proof | 1.5 fl oz shot | 60% | 147 kcal |
| 151 proof | 1.5 fl oz shot | 75.5% | 185 kcal |
These figures assume unflavored vodka with no mixer. If you add liqueur, cola, cranberry juice, or cream-based ingredients, add those calories separately — a single flavored mixer can easily double the final total.
Frequently Asked Questions
Does vodka really have zero carbs? Unflavored vodka contains no carbohydrates, fat, or protein. That makes it appealing on low-carb diets, but the alcohol itself still contributes roughly 7 kcal per gram. Zero carbs does not mean zero calories.
Why do different vodka brands seem to have different calories? The main variable is ABV. Two bottles with the same proof and the same pour size will have nearly identical alcohol calories. Small differences can come from traces of congeners, added sweeteners in flavored variants, or rounding on the label.
Can this calculator estimate calories for a mixed cocktail? It can estimate the vodka portion accurately. For a cocktail, add the calorie contributions from every other ingredient. Using the optional mixer field is the simplest way when the mixer calories per serving are known.
Is it safe to rely on the 7 kcal per gram figure? It is the standard Atwater energy value for alcohol and is widely used in food-composition databases, so it is an excellent approximation. Individual metabolism and drink temperature do not meaningfully change the calorie content.