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Malted barley is barley grain that’s been soaked, allowed to sprout, and then dried — a process called malting that unlocks natural enzymes inside the grain and converts some of its starch into fermentable sugar. It’s the base ingredient in beer and whisky, and it’s also one of the most useful (and most misunderstood) ingredients a home baker can add to a sourdough routine. The confusion usually starts here: most information about malted barley online is written for brewers, not bakers, and the two uses actually call for different types of malt. This guide covers both worlds — what malted barley is, how it’s made, and specifically how it works in sourdough baking.
Quick Answer: What Is Malted Barley?
- ✓ Barley grain that’s been soaked, sprouted, and dried (malted)
- ✓ The malting process activates enzymes that break starch into sugar
- ✓ Comes in two functional types for bakers: diastatic (active enzymes) and non-diastatic (enzymes deactivated by heat)
- ✓ Sold as whole grain, flour, or syrup, depending on the use
- ✓ In sourdough: boosts fermentation speed, crust color, and flavor in small amounts
- ✓ In brewing: converted into fermentable sugar to make beer and whisky
- ✓ Naturally contains B vitamins, iron, potassium, and calcium
Barley Malt vs. Malted Barley: Are They the Same?
Yes. Barley malt and malted barley are the same thing: barley grain that has been soaked, sprouted, and dried. The difference is the form you buy. Barley malt shows up as malt syrup (sometimes labeled “barley malt syrup”), malt powder, or malted barley flour. For sourdough, a small amount of diastatic barley malt feeds your starter’s yeast and deepens crust color, while non-diastatic barley malt adds flavor and sweetness only.
How Barley Becomes Malt: The 3-Stage Process
Malting sounds technical, but the process is simple once you break it into its three stages. Every malted barley product — whether it ends up in a beer, a loaf of bread, or a malted milkshake — goes through the same basic sequence.
1. Steeping
Raw barley kernels are soaked in water for several hours to bring their moisture content up to roughly 45%. This “wakes up” the dormant grain and tells it that conditions are right to start growing. The grain is alternated between water immersion and air rests so it doesn’t drown or suffocate.
2. Germination
Once hydrated, the barley is spread out and allowed to sprout for several days in a controlled, humid environment. This is the most important stage for bakers and brewers alike: as the grain germinates, it produces enzymes (mainly amylase) whose job is to break down the starch inside the kernel into simple sugars the growing seedling can use for energy. This enzyme activity is exactly what makes malted barley valuable in both beer and bread.
3. Kilning (Drying)
Germination is stopped by drying the grain with heat, called kilning. This is the stage that determines whether the final malt is diastatic or non-diastatic, and it’s the single most important detail for anyone using malted barley in sourdough.
- Low-temperature kilning preserves the enzymes created during germination. This produces diastatic malt — still enzymatically active, meaning it can continue converting starch to sugar once it’s mixed into dough.
- Higher-temperature kilning (used for darker, more flavorful malts) destroys the enzymes through heat. This produces non-diastatic malt — added purely for color, flavor, and sweetness, with no fermentation-boosting effect left.
This distinction is the single biggest point of confusion for home bakers buying malt for the first time, and it’s covered in full in our diastatic malt powder guide and non-diastatic malt powder guide.
Two-Row vs. Six-Row Barley: Does It Matter for Bread?
Barley used for malting comes in two main types, classified by the arrangement of kernels on the plant’s seed head: two-row and six-row. Brewers care about this distinction a lot — two-row barley tends to produce plumper kernels with a milder, sweeter flavor and is generally preferred for beer, while six-row barley has higher enzyme content and slightly more protein.
For bakers, the practical impact is smaller. What matters far more for bread is whether the malt is diastatic or non-diastatic, not which row-type of barley it started as — most malted barley flour and malt powder sold for baking doesn’t specify row type at all, and it doesn’t need to. If you’re buying malt specifically to formulate your own brewing recipes, row type matters. If you’re buying it to improve your sourdough, focus on the diastatic question instead.
Malted Barley Nutrition
Malted barley isn’t just a flavor and fermentation ingredient — it carries a real nutritional profile inherited from the whole grain. It’s a natural source of B vitamins, iron, potassium, and calcium. It contains complex carbohydrates and a modest amount of protein, including essential amino acids, though it isn’t a significant protein source on its own.
Malt syrup specifically — the thick, dark, extracted form of malted barley — is roughly 65% maltose, 30% complex carbohydrates, and 3% protein by composition. It’s about half as sweet as refined white sugar and carries a distinctive malty flavor. For the full nutritional and usage breakdown of the syrup form, see our malt syrup guide.
Malted Barley in Brewing vs. Malted Barley in Baking
The word “malt” gets used the same way in both industries, but the goal is different — and that changes which type of malted barley you actually want.
| Brewing | Sourdough Baking | |
|---|---|---|
| Goal | Convert starch to fermentable sugar for alcohol production | Boost fermentation speed, crust color, and flavor |
| Form used | Whole malted grain, milled and mashed | Malt powder, malted barley flour, or malt syrup |
| Diastatic or non-diastatic | Diastatic (enzyme activity is the whole point) | Usually diastatic in small amounts; non-diastatic for color/flavor only |
| Typical quantity | The majority of the grain bill | A small percentage of total flour weight (often under 1%) |
| Row-type relevance | Significant — affects flavor and yield | Minimal — diastatic activity matters more |
This is the gap most malted barley content online misses entirely — nearly everything written about malted barley is aimed at brewers, and it rarely mentions that the same base ingredient, in a different form and a much smaller quantity, does something genuinely useful in a loaf of sourdough.
Why Sourdough Bakers Use Malted Barley
Adding a small amount of diastatic malted barley (usually as malt powder) to sourdough dough does three things:
- Feeds the yeast faster. The active amylase enzymes break down starch in your flour into sugars your starter’s yeast can access immediately, giving fermentation a small but noticeable boost — especially useful in cooler kitchens or sluggish starters.
- Improves crust color. The extra available sugar caramelizes during baking, producing a deeper golden-brown crust than flour alone typically achieves.
- Adds subtle flavor and sweetness. Even in small amounts, malted barley contributes a faint malty note that rounds out the bread’s overall flavor without tasting distinctly “malty” if used correctly.
The key word throughout is small — diastatic malt is powerful in tiny amounts, and overuse leads to gummy, over-fermented dough that won’t hold its structure. See our full high-rise sourdough recipe using malt for exact ratios that work.
Forms of Malted Barley You’ll Find for Sale
Malted barley is sold in several forms depending on what you’re making:
- Whole malted barley grain — used mainly by brewers and distillers, milled and mashed to extract fermentable sugar
- Malt powder (diastatic or non-diastatic) — the most common form for home bakers, added by the teaspoon to dough; see our diastatic malt powder guide
- Malted barley flour — barley that’s been malted and then milled into a whole flour, used to replace a small percentage of a recipe’s flour for flavor and structure; see our malted barley flour guide
- Malt syrup — a thick, extracted liquid form used for sweetness and browning; see our malt syrup guide
Not sure which one applies to you? Our complete malt guide breaks down every type side by side, and our what is malting page covers the process in more depth if you want to try malting your own grain at home.
Other Everyday Uses of Malted Barley
Beyond beer and bread, malted barley shows up in more everyday products than most people realize: whisky, malt vinegar, malted milk drinks (Horlicks, Ovaltine, Milo), confections, and classic malted milkshakes. If you’ve ever had a flavor you couldn’t quite place as “malty,” there’s a good chance malted barley was behind it.
Frequently Asked Questions
What is barley malt?
Barley malt is another name for malted barley: barley grain that has been soaked, sprouted, and dried. It is sold as malt syrup, malt powder, or malted barley flour. In sourdough, a small amount of diastatic barley malt speeds fermentation and improves crust color, while non-diastatic barley malt adds flavor and sweetness only.
What is malted barley made of?
Malted barley is barley grain (Hordeum vulgare) that has been soaked, allowed to sprout, and then dried. The process converts some of the grain’s starch into fermentable sugar and activates enzymes, mainly amylase, that continue breaking down starch when the malt is added to dough or mash.
Is malted barley the same as malt powder?
Not exactly. Malted barley is the malted grain itself. Malt powder is a processed product made from malted barley (or another malted grain) that’s been dried and ground into a fine powder, sold specifically for baking in diastatic or non-diastatic form. See our diastatic malt powder guide for the full difference.
Can I use malted barley in sourdough bread?
Yes. A small amount of diastatic malt powder or malted barley flour added to your dough can speed up fermentation, improve crust color, and add subtle flavor. Use it sparingly — usually well under 1% of your total flour weight — since too much active enzyme content can break down dough structure and lead to gummy bread.
What’s the difference between diastatic and non-diastatic malted barley?
Diastatic malt still has active enzymes from the malting process, because it was dried at a low temperature. It continues converting starch to sugar once mixed into dough, boosting fermentation. Non-diastatic malt was dried at a higher temperature, which destroys the enzymes — it’s added purely for color, flavor, and sweetness with no fermentation effect.
Is malted barley gluten-free?
No. Barley naturally contains gluten, and the malting process doesn’t remove it. Malted barley and any products made from it (malt powder, malt syrup, malted barley flour) are not suitable for a gluten-free diet.
Why is malted barley used in beer?
Beer requires fermentable sugar, and raw barley doesn’t have enough of it in an accessible form. Malting activates the enzymes needed to convert the grain’s starch into fermentable sugar during the brewing mash, which yeast then converts into alcohol. Barley is preferred over other grains for its flavor, husk (which helps with filtering during brewing), and reliable enzyme content.
Related Malt Guides
- What is malt? — the complete guide to every malt type
- What is diastatic malt powder? — the active-enzyme form used to boost fermentation
- What is non-diastatic malt powder? — for color and flavor only
- What is malt syrup? — the liquid form and its uses
- What is malted barley flour? — whole malted barley milled into flour
- What is malting? — the full malting process explained
- How to malt your own grain for baking — DIY malting at home
- High-rise sourdough recipe using malt — exact ratios and technique