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Beer Calorie Calculator

Enter serving size, ABV, and original gravity to estimate calories.

How it is calculated

The estimate adds an alcohol part and a leftover-sugar part. With serving size oz in US fluid ounces, ABV in percent and original gravity OG written as 1.050:

alcohol = oz × 29.5735 mL × ABV/100 × 0.789 g/mL × 7 kcal/g (about oz × 1.633 × ABV)
residual points = max(0, (OG − 1.000) × 1000 − 7.5 × ABV)
carbs = oz × 0.4 × residual points
total = round(alcohol + carbs)

The residual-points line assumes stronger beers ferment out more of the wort sugar, and it is floored at zero, so a strong, fully fermented beer has no carbohydrate part. If serving or OG is left empty they default to 12 oz and 1.050; ABV is required. A serving of zero or less, an ABV that is negative or above 70%, or an OG outside 1.000–1.200 gives no result. Results are rounded to whole kcal and are rough estimates, not label values.

Worked example

A 12 oz beer at 5% ABV and OG 1.050. Alcohol part: 12 × 1.633 × 5 ≈ 98 kcal (ethanol by volume, converted to grams, times 7). Gravity points: (1.050 − 1.000) × 1000 = 50; points used by fermentation: 7.5 × 5 = 37.5; residual = 50 − 37.5 = 12.5. Carbohydrate part: 12 × 0.4 × 12.5 = 60 kcal. Total = 98 + 60 = 158 kcal.

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Common mistakes

  • Entering ABV as a fraction (0.05) instead of a percent (5). With 0.05 the alcohol part falls to about 1 kcal, while the default OG still adds 238 kcal of carbohydrate, so the total looks plausible but is wrong.
  • Typing the serving in millilitres. The field is in US fluid ounces, so a 330 ml bottle is about 11.2 oz and a 500 ml pint about 16.9 oz.
  • Writing OG as 1050 or 50 instead of 1.050. Only specific gravities from 1.000 to 1.200 are accepted, so 1050 or 50 shows no result instead of a figure of millions of kcal.
  • Using the final gravity instead of the original gravity. The formula already estimates the leftover sugar from OG and ABV.
  • Expecting the carbohydrate part to appear in every beer. For a 9% ABV beer with OG 1.060 the residual points drop to zero, so the 176 kcal is alcohol only.

About this calculator

A beer's calorie count comes from two separate sources: alcohol itself (about 7 kcal per gram) and residual carbohydrates — the unfermented sugars left over from the brewing process. This calculator estimates both by combining the serving size with the alcohol by volume (ABV) and the original gravity (the wort's sugar density before fermentation), a method rooted in brewing chemistry that's more accurate than flat lookup tables since it accounts for how much sugar a particular beer actually fermented out.

The approach is used by homebrewers calibrating recipes, nutrition-conscious drinkers comparing styles, and brewery labeling teams estimating nutrition facts for lighter or specialty beers. Because original gravity varies widely between a light lager and a high-gravity stout, splitting alcohol calories from carbohydrate calories gives a clearer picture than ABV alone of why two beers with similar strength can differ in calorie count.

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Comments (1)

  • Editorial team

    The gravity field moves the answer a lot: as long as some residual sugar is left, each gravity point of OG adds 4.8 kcal to a 12 oz serving, so guessing 1.040 instead of 1.050 changes the total by 48 kcal. The result is an estimate, not a label value. Post the serving, ABV and gravity of a beer whose printed calories you want to compare.

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