Comparison
American stout vs Imperial stout
What is the difference between American stout and Imperial stout?
The short answer
The main difference is alcohol warmth: Imperial stout has far more of it than American stout. American stout also leads on hop aroma and dryness; Imperial stout on yeast fruitiness (esters).
Generated from the two style records. No editor has written this comparison up, so it carries no verdict beyond what the data supports.
Where they overlap
They share comparable bitterness, roast, coffee, the same style family — the boundary between them is narrower than the comparison suggests.
Side by side
| American stout | Imperial stout | |
|---|---|---|
| Family | Porter & stout | Porter & stout |
| Fermentation | Top-fermented (ale) | Top-fermented (ale) |
| Origin | United States | United Kingdom |
| Category status | Established | Established |
| Strength | 5–7% ABV | 8–14+% ABV |
| Bitterness (IBU) — IBU measures iso-alpha acids in the lab. It does not track perceived bitterness, which residual sweetness, body and roast all alter — compare the sensory rows below for how each actually tastes. | 35–75 IBU | 50–90 IBU |
| Colour — These are the same depth in the glass; colour is not what tells them apart. | Black — 30–40 SRM, 59–79 EBC | Opaque black — 30–40 SRM, 59–79 EBC |
| Original gravity | 1.050–1.075 | 1.075–1.115 |
| Final gravity | 1.010–1.022 | 1.018–1.030 |
| Serving temperature | 9–12°C | 12–15°C |
| Carbonation | 2–3 vol CO₂ | 1–2 vol CO₂ |
| Glassware | Tulip glass, Nonic pint | Snifter, Tasting glass |
| Clarity | opaque | opaque |
How they taste different
| Character | American stout | Imperial stout |
|---|---|---|
| Alcohol warmth | Not characteristic | High–Very high |
| Hop aroma | Moderate | Not characteristic |
| Dryness | Moderate | Not characteristic |
| Yeast fruitiness (esters) | Not characteristic | Moderate |
| Body | Moderate | Very high |
| Caramel & toffee | Not characteristic | Moderate |
| Citrus | Low–Moderate | Not characteristic |
| Resin & pine | Low–Moderate | Not characteristic |
| Sweetness | Low | Moderate–High |
| Malt intensity | Moderate–High | Very high |
Which should you choose?
- You want more alcohol warmth → Imperial stout
- You want more hop aroma → American stout
Derived from where the two actually differ. Neither is better — this is a question of which difference you want.