Question 1

How do I calculate ABV from gravity readings?

Accepted Answer

Use the formula ABV = (OG − FG) × 131.25, where OG is Original Gravity and FG is Final Gravity in specific gravity units. For high-gravity brews above 6% ABV, the alternate formula ABV = (76.08 × (OG − FG) / (1.775 − OG)) × (FG / 0.794) gives more accurate results. Our calculator supports SG, Plato, and Brix units.

Question 2

How do I calculate cocktail ABV?

Accepted Answer

Multiply each ingredient's volume by its ABV percentage, sum up the total alcohol volume, then divide by the total drink volume. For example, 60 ml of 40% vodka plus 120 ml of juice gives 24 ml of alcohol in 180 ml total — about 13.3% ABV. The calculator also shows standard drink counts.

Question 3

What is the difference between ABV, Proof, and ABW?

Accepted Answer

ABV (Alcohol by Volume) measures alcohol as a percentage of total liquid volume. US Proof is simply double the ABV — so 40% ABV equals 80 proof. ABW (Alcohol by Weight) measures alcohol as a percentage of total weight, and is always lower than ABV because alcohol is lighter than water (density 0.789 g/ml).

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