Cold brew is the smoothest, least acidic coffee you can make — and it's also one of the easiest. No heat, no special equipment, no technique to master. You steep coarse ground coffee in cold water for 12 to 24 hours, strain it, and you have a rich, concentrated coffee that keeps in the fridge for up to two weeks.
The catch is patience. Cold brew doesn't rush. But the payoff — a coffee that's naturally sweet, incredibly smooth, and about 65% less acidic than hot-brewed coffee — is absolutely worth the overnight wait. This guide covers everything: the right ratio, grind, steep time, straining method, and how to serve it.
What You Need
Cold brew requires almost nothing:
- Coarsely ground coffee (or whole beans and a burr grinder)
- Cold or room-temperature filtered water
- A large jar, pitcher, or bowl
- A fine mesh strainer or cheesecloth (or a dedicated cold brew maker)
- A container to store the finished brew
That's it. You don't need a special cold brew maker, although they do make straining cleaner and easier. A mason jar and a coffee filter work just as well.
Cold Brew vs. Iced Coffee: What's the Difference?
They're not the same thing, and the difference matters. Iced coffee is hot-brewed coffee poured over ice — it's quick but the flavor is sharper, more acidic, and it dilutes as the ice melts. Cold brew is never heated at any point. The cold extraction process produces entirely different chemical compounds, which is why it tastes so different: smoother, sweeter, less bitter, and dramatically lower in acidity.
If you have a sensitive stomach or find regular coffee harsh, cold brew is often the fix.
The Right Ratio
Cold brew is typically made as a concentrate, then diluted before drinking. The most reliable starting ratio for concentrate is 1:4 by weight — one gram of coffee per four grams of water.
Small Batch (1 cup / 240ml concentrate)
Use 60g of coffee and 240ml of water. Dilute 1:1 with water or milk to serve — makes about 2 cups of finished cold brew.
Medium Batch (2 cups / 480ml concentrate)
Use 120g of coffee and 480ml of water. Dilute 1:1 to serve — makes about 4 cups. This is the sweet spot for most households.
Large Batch (1 quart / 950ml concentrate)
Use 235g of coffee and 950ml of water. Dilute 1:1 to serve — makes roughly 8 cups. Keeps refrigerated for up to 2 weeks.
If you prefer to brew straight-to-drink (not concentrate), use a 1:8 ratio instead and drink it undiluted over ice. It'll be lighter but still smooth.
Grind Size: Go Coarse
Cold brew requires a very coarse grind — coarser than French press. The grounds should look like rough breadcrumbs or coarse cornmeal. This is critical because cold water extracts much more slowly than hot water. If you use a medium or fine grind, the 12 to 24 hour steep will over-extract the coffee and make it bitter, harsh, and astringent — the opposite of what you want.
The coarse grind also makes straining far easier. Fine grounds clog filters and take forever to drain. Coarse grounds strain cleanly in minutes.
Step-by-Step Cold Brew Instructions
Step 1 — Grind Your Coffee
Grind your beans to a very coarse setting — the coarsest your grinder allows. Pre-ground coffee labeled "coarse" or "cold brew" works too, though freshly ground is always better.
Step 2 — Combine Coffee and Water
Add your ground coffee to a large jar or pitcher. Pour cold or room-temperature filtered water over the grounds. Stir well to make sure all grounds are fully saturated — dry pockets on top won't extract at all.
Step 3 — Cover and Steep
Cover the jar loosely (a lid, plate, or plastic wrap is fine) and place it in the refrigerator. Steep for 12 to 24 hours. Most people find 16 to 18 hours hits the perfect balance — smooth and rich without being over-extracted. You can also steep at room temperature for 8 to 12 hours for a slightly brighter flavor.
Step 4 — Strain the Coffee
Set a fine mesh strainer over a clean jar or pitcher. Pour the steeped coffee through the strainer. For the cleanest results, line the strainer with a paper coffee filter or cheesecloth. The first strain removes the bulk of the grounds; a second pass through a paper filter removes the remaining fine sediment.
Step 5 — Store and Serve
Transfer the strained concentrate to a sealed jar or bottle. Refrigerate for up to 2 weeks. To serve, dilute 1:1 with cold water, milk, or a milk alternative over ice. Adjust the ratio to your taste — stronger or weaker is entirely up to you.
Steep Time: How Long Is Too Long?
The longer you steep, the stronger and more concentrated the cold brew. Here's a general guide:
8–12 hours (room temperature)
Lighter, slightly brighter flavor with more acidity than longer steeps. Good option when you forget to start it the night before.
12–18 hours (refrigerator)
The sweet spot for most people. Smooth, rich, and balanced — the classic cold brew profile.
20–24 hours (refrigerator)
Stronger and more intense. Best if you plan to dilute heavily or use it in cocktails or recipes. Can become slightly bitter at the very high end.
Choosing the Right Coffee for Cold Brew
Cold brew works with any coffee, but certain roasts and origins shine more than others:
- Medium roast: The most versatile choice. Produces a well-rounded cold brew with chocolate, caramel, and nutty notes. Hard to go wrong here.
- Dark roast: Creates a bold, rich cold brew with deep chocolate and smoky undertones. Excellent for those who love intense coffee.
- Light roast: Works but is less common. Light roasts can produce a more complex, fruity cold brew — but they're less forgiving with steep time and may taste thin if under-extracted.
- Single-origin beans: Ethiopian beans produce a distinctly fruity, almost wine-like cold brew. Colombian beans yield chocolate and caramel. Worth experimenting with.
Our Favorite Coffee for Cold Brew
Death Wish Coffee (Organic Dark Roast) — $16
Bold, smooth, and low-acid — Death Wish is purpose-built for intense cold brew. The organic dark roast produces a rich concentrate with deep chocolate notes that holds up perfectly when diluted over ice.
Check it out →Best No-Gear Cold Brew Setup
Mueller French Press Coffee Maker — $34
A French press is the easiest cold brew tool you already (almost) have. Steep your grounds directly in it overnight, press, and pour. No separate straining needed. The double-wall insulation also keeps it cold while it steeps in the fridge. Perfect for cold brew batches up to 34 oz.
Check it out →Straining Options
Clean Methods
- Paper coffee filter: Produces crystal-clear cold brew with no sediment. Slow but worth it for the cleanliness.
- Dedicated cold brew maker: Filters built in, easy to pour and store. Most convenient option.
- Nut milk bag: Reusable, easy to squeeze, excellent filtration. Great for large batches.
Quick Methods
- Fine mesh strainer only: Fast but leaves fine sediment. Coffee will be slightly cloudy and have more texture at the bottom of the cup.
- Cheesecloth: Better than a mesh strainer alone, slightly less clean than paper. Good middle ground.
- French press: Excellent built-in filter. Press and pour straight from the press. One of the best no-gear solutions.
How to Serve Cold Brew
If you made concentrate, always dilute before drinking. The most common ways to serve it:
- Classic over ice: Fill a glass with ice, add equal parts concentrate and cold water. Add a splash of milk or cream if desired.
- Cold brew latte: Dilute concentrate with milk or oat milk instead of water. Incredibly smooth and creamy.
- Nitro-style: Pour cold brew into a cream whipper with a nitrogen cartridge and dispense over ice. Silky, foam-topped cold brew at home.
- Cold brew tonic: Add concentrate to sparkling tonic water over ice. Refreshing and slightly bitter in the best way.
- In recipes: Cold brew concentrate works beautifully in smoothies, overnight oats, tiramisu, and coffee cocktails.
Frequently Asked Questions
How long does homemade cold brew last in the fridge?
Cold brew concentrate keeps well for up to 2 weeks when stored in a sealed container in the refrigerator. Straight-to-drink (not concentrate) cold brew is best within 7 to 10 days. If it starts to taste flat or sour, it's past its prime. Keeping it sealed and cold is key to maximizing shelf life.
Do I need a special cold brew maker?
No. A mason jar and a coffee filter or fine mesh strainer produce cold brew just as good as dedicated equipment. Cold brew makers are convenient — they have built-in filters and make straining easier — but they're a nice-to-have, not a requirement. Start with what you have at home.
Can I make cold brew with pre-ground coffee?
Yes, as long as it's a coarse grind. Look for bags labeled "coarse grind" or "cold brew grind." Avoid using regular medium or fine ground coffee — the long steep time will over-extract it and make it bitter. If you only have medium ground, reduce the steep time to 10 to 12 hours to compensate.
Why does my cold brew taste bitter?
Bitterness in cold brew is almost always caused by one of three things: grind too fine, steep time too long, or ratio too strong. Try coarsening your grind first — this is the most common culprit. If grind size isn't the issue, reduce the steep time by 2 to 4 hours. If it's still too intense, dilute more aggressively when serving.
Is cold brew stronger than regular coffee?
Cold brew concentrate is significantly stronger than regular hot coffee — roughly 2 to 3 times the caffeine concentration. But when you dilute it 1:1 before drinking, the caffeine content ends up comparable to a regular cup of drip coffee. If you drink the concentrate undiluted, yes, it's much stronger. Be mindful of dilution if you're sensitive to caffeine.
Can I make hot coffee from cold brew concentrate?
Absolutely. Add 1 part cold brew concentrate to 1 part hot water instead of cold water. It heats up instantly and produces a very clean, smooth hot coffee with none of the acidity of traditionally brewed hot coffee. Many people with sensitive stomachs prefer this method year-round.
The Short Version
Use a 1:4 coffee-to-water ratio, grind very coarse, steep 12 to 18 hours in the fridge, strain through a paper filter, dilute 1:1 to serve. That's the whole recipe. The only thing standing between you and exceptional cold brew is overnight patience — and that's a very low barrier for a coffee that keeps for two weeks.
Once you start making cold brew at home, buying bottled cold brew at the store becomes hard to justify. Homemade is fresher, cheaper, and completely customizable to your taste.