Skip to content
ENExplore Calculators

Final Gravity And ABV Calculator

Work out final gravity and abv instantly with clear inputs, formula shown and shareable results.

About Final Gravity And ABV Calculator

The standard approximation is ABV = (OG - FG) x 131.25, accurate to about 0.2% for beers below 1.070. Above that, the advanced formula 76.08(OG-FG)/(1.775-OG) x FG/0.794 is more reliable because the simple linear factor overstates alcohol in strong worts.

Formulas

Simple ABV

ABV % = (OG - FG) x 131.25

Advanced ABV

ABV % = 76.08 x (OG - FG) / (1.775 - OG) x FG / 0.794

Worked example

With the default values below, Final Gravity And ABV Calculator returns Alcohol By Volume of 5.6437%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Original Gravityaccepts 0.9–1.2
1.055
Final Gravityaccepts 0.9–1.2
1.012
Batch Volumeminimum 0 L
20 L
Priming Sugar Contributionaccepts 0–0.02 SG points
0.002 SG points

Results

Alcohol By Volume
5.6437%
ABV By Advanced Formula
5.7912%
ABV Including Priming
5.9062%
Total Alcohol Mass
890.6

Step by step

  1. 1Values used
  2. 2Simple ABV
  3. 3Advanced ABV
  4. 4Alcohol By Volume= 5.6437
  5. 5ABV By Advanced Formula= 5.7912
  6. 6ABV Including Priming= 5.9062
  7. 7Total Alcohol Mass= 890.6

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
  • Declared alcohol content is legally regulated with defined tolerances. Verify by an approved method before labelling.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Declared alcohol content is legally regulated with defined tolerances. Verify by an approved method before labelling.

Frequently Asked Questions

Why do the two formulas diverge?

The linear factor assumes a fixed relationship between gravity drop and alcohol, which breaks down at high alcohol because ethanol's effect on density is not linear. Above 8% ABV use the advanced form.

Does bottle conditioning change ABV?

Slightly. Priming sugar ferments to add roughly 0.2-0.4% ABV depending on the dose, which matters when declaring alcohol content on a label.

Related Calculators

Final Gravity And ABV Calculator | Calcrivo