Top-down Brew: Estimate Calories and Carbohydrates in a Beer Serving

Method #1: Gravity readings

Method #2: Alcohol by volume

Results

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Notes

This calculator estimates beer Calories (kcal) and carbohydrates. The measured Calories may be slightly different (< 1%) due to differences in protein content, real degree of fermentation, and unfermentable sugars (example: lactose).

Formula: Kcal = (6.9 kcal/g * ABW%) + (4 kcal/g * (RE - ash) where ABW: Alcohol by weight, RE: real extract, and ash = .1 (a commonly used constant for mineral solids; Oxford Companion to Beer, as cited in Stanley, 2021). The left side of the equation estimates the calories from alcohol. The right side calculates calories from unfermented carboydrates.

The formula is expressed for 1 deciliter (i.e., 0.1 L or 100 mL), which seems to be the standard for these calculations.

References

Fix, G.J., and Fix, L.A. (1997). An Analysis of Brewing Techniques, Brewers Publications, p. 141 - 142.

Stanley, S. (2021, October). Counting calories and carbs: Get the skinny on your homebrew. Brew Your Own, p. 32 - 36.