“Cold brew” is sometimes used as slang for a cold beer — particularly in parts of the American South, Midwest, and in Australian slang, where “a cold one” and “a brew” both refer to beer, making “cold brew” a natural combination. But in the vast majority of contexts today, cold brew refers to a method of making coffee by steeping coarsely ground beans in cold or room-temperature water for 12 to 24 hours, producing a smooth, low-acid coffee that’s fundamentally different from regular iced coffee.
Here’s the quick rundown on the slang usage, and then everything you need to know about what cold brew coffee actually is.
Where “Cold Brew” Means Something Else
The slang usage is pretty straightforward. “Brew” has been slang for beer in English since at least the 1800s — beer is literally brewed, after all. Add “cold” in front, and you get a casual way to say “cold beer.” You’ll hear it in phrases like:
- “Grab me a cold brew from the fridge” (meaning beer)
- “Nothing beats a cold brew after mowing the lawn”
- “Cold brews on the patio tonight”
Context usually makes the meaning clear. If someone’s at a bar or a backyard barbecue, they probably mean beer. If they’re at a café or reading a coffee menu, they mean coffee. The coffee meaning has overtaken the beer slang significantly since the 2010s as cold brew coffee went mainstream.
In home brewing (beer) communities, “cold brew” can also refer to certain cold-temperature fermentation techniques, though craft brewers typically use more specific terms like “cold fermentation” or “cold crashing” to avoid confusion.
What Cold Brew Coffee Actually Is
Cold brew coffee is made by steeping coarsely ground coffee beans in cold or room-temperature water for an extended period — typically 12 to 24 hours. No heat is involved at any point in the process. This is the key difference from every other coffee brewing method.
Here’s why that matters: heat is what extracts the bitter compounds and acids from coffee beans quickly. Without heat, extraction happens slowly and selectively. Cold brewing extracts fewer of the acids that hot brewing pulls from the same beans — research published in Scientific Reports found cold brew has a lower total titratable acidity than hot brew, though pH is comparable. The result is a smoother, slightly sweet flavor profile with virtually no bitterness when done right.
For a complete breakdown of the cold brew process, check out our ultimate cold brew guide.
Cold Brew vs. Iced Coffee: They’re Not the Same Thing
This is the most common misconception about cold brew, and it’s worth clearing up:
- Iced coffee is regular hot-brewed coffee that’s been cooled down and poured over ice. It’s made in minutes. It tastes like cold coffee — with all the acidity and bitterness of a hot brew, just cold.
- Cold brew is never heated. It’s a fundamentally different extraction process that produces a different chemical profile in the cup. It takes 12–24 hours to make, and the flavor is smoother, heavier-bodied, and less acidic.
Think of it this way: iced coffee is hot coffee that got cold. Cold brew was never hot in the first place. The difference in taste is immediately noticeable — many people who try cold brew side-by-side with iced coffee prefer the cold brew for its smoothness.
Why Cold Brew Got So Popular
Cold brew went from a niche method to a mainstream category for a few reasons:
- Lower acidity: Cold brewing extracts fewer of the acids that hot brewing pulls from the same beans — research published in Scientific Reports found cold brew has a lower total titratable acidity than hot brew, though pH is comparable. If you have a digestive condition, talk to your doctor.
- Naturally smooth taste: No bitterness means you don’t need sugar or cream to make it drinkable. That makes cold brew a natural fit for zero-sugar and unsweetened coffee drinkers.
- Higher caffeine potential: Because cold brew uses more grounds per ounce of water, the caffeine content can be significantly higher. A single can of Bare Brew contains 320mg of caffeine — equivalent to about 3–4 cups of regular drip coffee.
- Convenience of RTD: Ready-to-drink canned cold brew means you don’t have to make it at home. Brands like Bare Brew use shelf-stable canning to deliver cold brew that keeps for months without refrigeration — making it portable for commutes, gym bags, and office desks.
How Cold Brew Is Made (The Process)
Whether you’re making it at home or buying it in a can, the core process is the same:
- Coarsely grind high-quality coffee beans (coarse grind reduces over-extraction and bitterness)
- Combine grounds with cold water at a ratio between 1:4 (concentrate) and 1:8 (ready-to-drink)
- Steep for 12–24 hours — no heat, no agitation
- Filter the grounds out through a mesh strainer or cheesecloth
- Serve over ice, diluted, or straight
Bare Brew uses Honduran Arabica beans and this same cold-steeping process, then cans the finished brew with nothing else added — just coffee and water. No sugar, no preservatives, no natural flavors. Two ingredients, period. You can see how that compares to other brands in our healthiest canned coffee guide.
What Research Says About Cold Brew Coffee
Cold brew contains the same compounds researchers study in coffee generally — antioxidants and caffeine among them — plus a few characteristics specific to the brewing method:
- Lower titratable acidity: Cold brewing extracts fewer acids than hot brewing. That is a property of the brewing method, not a health claim — if you have a digestive condition, talk to your doctor.
- No added sugar needed: The natural sweetness of cold brew means many drinkers take it black — skipping the 20–40g of sugar that lattes and flavored coffees add.
- No sugar spike: Black cold brew contains no added sugar, so there is no sugar spike to come down from. Individual responses to caffeine vary. For more on how cold brew compares to energy drinks, see our functional cold brew guide.
- Low calorie (black): A 12oz can of Bare Brew has 20 calories and 0g sugar. Whether that fits your keto or intermittent fasting protocol is up to you — check with your doctor.
Frequently Asked Questions
Is cold brew the same as cold drip coffee?
No. Cold drip (also called Kyoto-style or Dutch coffee) uses a slow drip of cold water through a bed of grounds — it’s a drip method, not an immersion method. Cold brew submerges all the grounds in water for the full steep time. Cold drip equipment is more expensive and produces a slightly different flavor profile.
Does cold brew have more caffeine than hot coffee?
It can. Caffeine content depends on the bean-to-water ratio and steep time. Most cold brew recipes use more coffee per ounce of water than hot drip methods, resulting in higher caffeine concentration. A can of Bare Brew has 320mg — more than double a typical 8oz cup of drip coffee.
Can you heat up cold brew?
Yes. Cold brew heated in a microwave or with hot water retains its low-acid, smooth flavor profile. The acids that make hot-brewed coffee harsh were never extracted in the first place, so adding heat to the finished product doesn’t recreate them.
Why is cold brew so smooth compared to regular coffee?
Heat extracts chlorogenic acid, quinic acid, and other bitter compounds very efficiently. Cold water extracts these compounds at a much lower rate — research published in Scientific Reports found cold brew has a lower total titratable acidity than hot brew, though pH is comparable. That’s why cold brew tastes smoother and sweeter even without any sugar added.
Is “cold brew” trademarked?
“Cold brew” is a generic term for a brewing method and cannot be trademarked. Individual brand names and logos can be trademarked, but the term itself describes a process — like “drip coffee” or “French press.”
