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AHA Guideline

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British-Style Imperial Stout

British-Style Imperial Stouts are dark copper to very dark. Hop aroma is very low to medium, with qualities such as floral, -citrus or -herbal. Extremely rich malty flavor, often characterized as toffee-like or caramel-like, is sometimes accompanied by very low (sometimes absent) roasted malt astringency. Hop flavor is very low to medium. Hop bitterness is medium, and should not overwhelm the overall balance. The bitterness may be higher in darker versions yet balanced with sweet malt. High alcohol content is evident. High fruity-ester character may be present. Diacetyl should be absent.


  • Original Gravity (°Plato) 1.080 - 1.100 (19.3 - 23.7)
  • Apparent Extract/Final Gravity (°Plato) 1.020 - 1.030 (5.1 - 7.6)
  • Alcohol by Weight (Volume) 5.50% - 9.50% (7.00% - 12.00%)
  • Bitterness (IBU) (45 - 65)
  • Color SRM (EBC) 20 - 35+ (40 - 70+)