Homebrew Beer Recipe Scaler
Batch Size Scaler
Scale a recipe to a different batch size
OG/FG & ABV Calculator
Calculate original gravity, final gravity, and ABV
Formula
Scale Factor = Target Volume / Original Volume | OG = 1 + (Grain lbs × PPG × Efficiency / Volume) / 1000 | ABV = (OG - FG) × 131.25
Frequently Asked Questions
How do I scale a homebrew recipe?
Multiply all grain and hop amounts by the ratio of new batch size to original batch size. For example, scaling a 5-gallon recipe to 10 gallons means multiplying everything by 2.0. Yeast should be rounded up, and hop utilization may change slightly with volume.
What is a good mash efficiency for homebrewing?
Beginning all-grain brewers typically achieve 65-70% efficiency. Experienced brewers with refined processes get 75-80%. Brew-in-a-bag (BIAB) typically yields 60-70%. Extract brewing is effectively 100% since the sugars are already extracted.
How do I calculate ABV from gravity readings?
ABV = (OG - FG) x 131.25. For example, a beer with OG 1.050 and FG 1.010 has ABV = (1.050 - 1.010) x 131.25 = 5.25%. Always measure gravity at the same temperature (typically 60F/15.5C) for accuracy.
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