How Beer Is Made: From Grain to Glass, Explained Simply

Beer has been made from the same four ingredients for centuries: water, malted grain, hops and yeast. That simplicity hides some genuinely clever science. Between the raw barley and the pint in your hand, a brewer coaxes starch into sugar, sugar into alcohol, and a bitter flower into flavour and shelf life. Here is exactly how beer is made, step by step and in plain English, with the important bits sourced.

1. The four ingredients

For hundreds of years brewers have used just four things to make beer: malt, hops, yeast and water[1]. Each has a clear job. For a deeper look at everything that can end up in the glass, from adjuncts to additives, see our full beer ingredients guide.

Malt usually means malted barley, and it is the engine of the whole process. It carries the starch that becomes fermentable sugar, and without that sugar there is no alcohol[1]. Malt also gives beer much of its colour, flavour and body. Water makes up most of the finished drink, and its mineral content quietly nudges a beer toward one style or another. Hops are the flower that balances malt sweetness with bitterness while adding aroma and helping the beer keep[3]. Yeast is the living ingredient that does the actual magic, eating sugar and giving back alcohol and carbon dioxide[4].

Some countries even wrote this simplicity into law. Germany’s famous purity rule limited beer to these basics for centuries, one of several oddities we cover in our weird beer laws guide.

2. The eight steps, at a glance

Brewing is a sequence. The grain is prepared, its sugar is extracted and boiled with hops, then yeast ferments it and the beer is matured and packaged. The standard steps run like this[2]:

The rest of this guide walks through the stages that do the real work: malting, mashing, the boil, fermentation and conditioning.

3. Malting: turning grain into malt

Raw barley is not much use to a brewer. Malting fixes that. The grain is steeped in water to wake it up, allowed to germinate so it starts sprouting, then dried in a kiln to stop the process[2]. Germination unlocks the starches inside the grain and builds the natural enzymes that will later convert those starches into sugar.

The kilning stage is also where a lot of a beer’s character is set. A light kilning gives the pale malt behind a lager; longer, hotter roasting gives the deep brown and black malts behind stouts and porters. That is the direct link between malt and how a beer looks, which we cover in full in our beer colour and SRM guide. The malt is then milled, cracked open so water can reach the starch inside. Since it starts with a farmed grain, people sometimes ask about pesticide residue – we looked at the actual test data in is there glyphosate in beer.

4. Mashing: starch into sugar

Mashing is the step that makes beer possible. The milled malt is mixed with hot water and held at carefully chosen temperatures, and the enzymes built during malting go to work, breaking the grain’s starch down into fermentable sugars[1][2]. Get the temperature right and you get a sweet, sugary liquid; get it wrong and the enzymes stop working before the job is done.

The sugary liquid produced is called wort, and it is essentially unfermented beer. Once the sugars have been released, the wort is separated from the spent grain in a step called lautering, then moved to the kettle for the boil[2]. Not every scrap of starch is converted, but enough is to feed the yeast later on.

5. The boil and the hops

The wort is boiled, which sterilises it and concentrates the sugars, and this is where hops enter. Hops are added at different times for different reasons. Bittering hops go in near the start of the boil, where a long exposure to heat extracts their bitterness to balance the malt’s sweetness. Aroma hops go in late, anywhere from about 30 minutes before the end down to the very last moment, because their delicate oils would simply boil away if added early[3].

Beyond flavour, hops earn their place by doing real work: they add bitterness, improve the beer’s microbiological stability so it keeps longer, and help hold a good head of foam[3]. A brewer who wants a big hop aroma without extra bitterness can also add hops to the finished, fermented beer, a technique called dry hopping[3]. After the boil the wort is cooled, ready for the one ingredient that has been waiting in the wings.

6. Fermentation: sugar into beer

Now the yeast goes in, and the wort becomes beer. Yeast is a single-celled microbe that consumes the sugars in the wort and produces alcohol and carbon dioxide as it goes[4]. Almost every beer in the world is made with one of two yeast species, and the choice defines the two great families of beer.

Ale yeast (Saccharomyces cerevisiae) ferments warm and is often called top-fermenting. Lager yeast (Saccharomyces pastorianus) ferments cooler and settles to the bottom[4]. The two behave differently in their ideal temperatures, the sugars they prefer, and how cleanly they settle out, and those differences are a big part of why an ale tastes fruitier and a lager tastes crisp and clean[4].

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7. Conditioning and how long it takes

Fresh out of fermentation, beer is not quite ready. A conditioning or maturing stage lets the yeast clean up rough by-products and the flavours settle. This is where ales and lagers part company most dramatically.

Most ales take a short warm conditioning of roughly 5 to 10 days after the main fermentation, and can be ready to drink around 3 to 4 weeks from brew day[5]. Lagers get an extended cold maturation, traditionally around 4 to 12 weeks near freezing, the slow process that gives lager its clean, smooth character and bright clarity[5]. That long cold rest, called lagering, is the main reason a proper lager takes so much longer to make than an ale. Finally the beer is filtered if needed, carbonated and packaged into bottles, cans or kegs. For the full timeline breakdown, including homebrew schedules, see our how long it takes to brew beer guide.

Curious how all this scales up worldwide, from the biggest brewing nations to what a pint costs where? Our global beer statistics page has the numbers.

8. Frequently asked questions

Sources and references

1. Cicerone Certification Program, How is Beer Made – The Basics
2. Wikipedia, Brewing (steps in the brewing process)
3. The Oxford Companion to Beer, hops
4. Beer Judge Certification Program, Yeast and Fermentation
5. BeerFYI, Fermentation, Conditioning and Aging

General information for curious drinkers and beginner brewers. Please drink responsibly. Reviewed August 2026.