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How to Calculate ABV from Gravity
Formula
ABV (alcohol by volume) is calculated from the difference between original gravity (before fermentation) and final gravity (after fermentation).
Apparent attenuation measures what percentage of available sugars were fermented. Most ales achieve 70-80% attenuation.
Common use cases:
- Homebrewing ABV calculation
- Wine fermentation tracking
- Hard cider alcohol estimation
Frequently Asked Questions
Dr. David Park
Applied Mathematician, PhD Mathematics
David holds a PhD in Applied Mathematics from MIT. He has published research on numerical methods and computational algorithms used in engineering and scientific calculators.
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