The Brew Times

Porter vs. Stout: What's the Difference?

If you've ever ordered a dark beer and wondered whether it was a porter or a stout, you're not alone. These two classic beer styles share a lot of similarities — rich color, roasted flavors, and cozy winter vibes — but they're not quite the same. Guinness might be the most famous stout in the world, but it's far from the only one out there. There's a whole world of sub-styles to explore — from creamy milk stouts and bold imperial stouts to coffee-infused versions. But even with all that diversity, stouts are often confused with their close cousin: the porter. So, what exactly sets them apart? What Is a Stout Beer? The biggest difference between a stout and a porter comes down to the grain bill — specifically, the type of barley used. Stouts are typically brewed with unmalted roasted barley, which gives them their signature deep black color and bold, roasted flavor. That roasted barley also imparts coffee-like bitterness and a drier finish compared to the smoother sweetness of porters. What is Unmalted Roasted Barley? Unmalted roasted barley is raw barley roasted without undergoing the malting process. Skipping malting means the grain's starches aren't converted into fermentable sugars, so instead of contributing to the beer's alcohol content, it primarily adds color and flavor. This ingredient is what gives stouts their distinct, dry, coffee-like, and slightly bitter "bite." Its flavors are often described as smoky, roasted, or espresso-like, and it imparts that deep brown-to-black color you expect from a dark beer. Because of its intensity, brewers use it to create the bold roast character that separates stouts from their sweeter, malt-forward porter cousins. Stouts also tend to have a fuller body and higher alcohol content (ABV), though there are exceptions — take Guinness, for example, which is surprisingly light at just 4.2% ABV. Modern brewers love experimenting with the style, leading to popular sub-categories like: Milk Stouts - brewed with lactose for a creamy, slightly sweet flavor Oatmeal Stouts - smooth and silky thanks to oats in the grain bill Imperial Stouts - bold, boozy, and intense Pastry and Coffee Stouts - packed with dessert-like or roasted flavors What is Porter Beer? Before there were stouts, there were porters. The style dates back to 18th-century England and was named for the dock workers — or "porters" — who loved drinking it after long shifts. Originally, porters were a heartier offshoot of brown ales, brewed with malted barley rather than unmalted roasted barley. That gives them a smoother, sweeter flavor with notes of caramel, chocolate, and dark fruit rather than the sharper roast found in stouts. As brewers began producing stronger versions of the style, they called them "stout porters." Over time, "stout" became its own distinct category — though both styles still share common roots. Porter vs. Stout: Key Differences Feature Malt Flavor Color Body ABV Porter Roasted malted barley Smoother, sweeter, with caramel and chocolate notes Dark brown to black Lighter to medium-bodied Typically moderate Stout Roasted unmalted barley Bolder, roasted, coffee-like, and sometimes bitter Deep black sometimes with a purplish hue Fuller-bodied and more intense Often higher, though not always How to Tell Them Apart When in doubt, think of porters and stouts like siblings: related, but not identical. Porters are the easy-drinking, approachable older sibling; smooth, sweet, and perfectly balanced. Stouts are the bolder, more intense younger sibling; roasted, rich, and full-flavored. If you're sipping something that reminds you of chocolate or caramel, it's probably a porter. If it leans more toward espresso or dark roast coffee, you're likely drinking a stout. The Bottom Line The difference between porters and stouts might be subtle, but it's one worth exploring pint by pint. Whether you prefer the smooth sweetness of a porter or the bold roast of a stout, both offer the comforting, malt-forward character that makes dark beers so satisfying. Want an easy way to taste the difference for yourself? Try brewing them at home! Mr. Beer offers a variety of stout and porter kits, refills, and recipes. It's the perfect way to experiment with both styles and find your favorite. Just add water, follow the simple instructions, and enjoy your freshly brewed dark beer in just a few weeks.