Specification · Ch.4 engine
Spec calculator
Enter any two analyses you know and derive the complete specification — real and apparent extract, ABV, RDF, attenuation, calories and more.
Known analyses
Extract of the original wort, °Plato (% w/w).
Fraction of real extract fermented (% w/w).
Full analysis derived from your two inputs.
closed formGravity & extract
Original Gravity
13.00 °P
Original wort extract
Real Extract
4.771 °P
True (dealcoholised) extract
Apparent Extract
2.78 °P
Hydrometer reading
Beer Specific Gravity
1.0109
20/20 °C
Alcohol
ABV (20 °C)
5.46 % vol
Alcohol by volume
ABW
4.269 % w/w
Alcohol by weight
ABV (15.56 °C)
5.36 % vol
At 60 °F
RDF
64.9 %
Real degree of fermentation
Attenuation
RDA
63.3 %
Real attenuation
ADA
78.6 %
Apparent attenuation
E/A ratio
1.12
Extract-to-alcohol
Nutrition (per serving)
Calories
202 kJ / 100 mL
Energy
Carbohydrate
4.08 g / 100 mL
Protein
0.55 g / 100 mL
Estimated at 97 % malt
Ash
0.19 % w/w
Default estimate
Colour (SRM ⇄ EBC)
European Brewery Convention
Seeded specification library
3 example specifications. Select one to inspect its analysis lines (target with low/nominal/high band).