Cold Brew Coffee Guide

Cold brew is the easiest way to make smooth, low-acid coffee at home — and it's almost impossible to mess up. No special equipment, no temperature control, no precise timing. You combine coffee and water, wait twelve to twenty-four hours, and strain. This guide covers the five recipes, the ratios that matter, the gear that helps, and the Doctopus coffees that shine in cold brew.

What cold brew actually is

Cold brew is coffee made with cold or room-temperature water and a long steep — typically twelve to twenty-four hours. That's the whole definition. The temperature is what makes it taste different from any hot-brewed coffee you've had: hot water extracts coffee in five minutes by aggressively dissolving acids, oils, and sugars all at once; cold water extracts the sugars and most of the body but leaves a large fraction of the acids behind. The cup ends up smoother, sweeter, and noticeably less acidic.

Cold brew is not the same as iced coffee. Iced coffee is hot-brewed coffee poured over ice — it keeps the bright, acidic profile of the original brew, just cold. Cold brew is its own brewing method with its own flavor signature: chocolate, caramel, vanilla, low acidity, and a thick mouthfeel that drinks more like a coffee milkshake than a hot cup. If your stomach reacts to the acidity in hot coffee, cold brew is often a comfortable alternative.

Two more things to know before you start. First, cold brew is typically made as a concentrate that you dilute 1:1 with water, milk, or ice — so 32 oz of finished brew becomes 64 oz of drinkable coffee. Second, cold brew keeps in the fridge for ten to fourteen days without losing much flavor, which is why it pairs so well with batch brewing.

Cold brew ratios: finding your perfect strength

Ratio is the single biggest taste lever in cold brew. Steep time is a smaller correction; grind size matters mostly for filtration; ratio sets whether you're making a concentrate or a ready-to-drink brew.

Style Ratio Coffee Water How to drink it
Strong concentrate 1:5 150 g 750 g Dilute 1:1 with water or milk
Standard concentrate 1:8 100 g 800 g Dilute 1:1 with water or milk
Light concentrate 1:10 80 g 800 g Dilute 1:1 or pour over more ice
Ready-to-drink 1:12 75 g 900 g Drink straight from the fridge
Mild ready-to-drink 1:16 60 g 960 g Drink straight, light strength

The 1:8 standard concentrate is the recipe to start with — it produces a forgiving brew with enough strength to handle dilution by ice melt and milk, and it's what every recipe on the rest of this page assumes. Once you've made it a few times, lean toward 1:5 if you drink cold brew with a lot of milk (latte-style), or toward 1:12 if you'd rather skip the dilution step entirely.

How to dilute concentrate

  • 1:1 with cold water — the standard. Pour 4 oz concentrate + 4 oz water over ice in an 8 oz glass.
  • 1:1 with milk — instant cold-brew latte. Pour 4 oz concentrate + 4 oz whole milk or oat milk over ice.
  • Straight over ice — the ice melts and dilutes the brew to roughly 1:1 strength as you drink it.
  • Splash of milk — keeps the brew strong for caffeine, adds creaminess without diluting much.

Equipment you'll need

  • A vessel — anything that holds at least 1 liter (32 oz) of liquid and seals shut. A wide-mouth mason jar (2 quart) is the cheapest and works perfectly. A French Press, a Hario Mizudashi bottle, or a Toddy system all work too — they just have built-in filtration that saves you the straining step.
  • A burr grinder — coarse grind is what cold brew needs. Blade grinders produce uneven particles, which cause some grounds to over-extract while others under-extract, leaving a muddier cup. A Baratza Encore or Wilfa Svart is plenty.
  • A kitchen scale with 1 g precision. Volume measurements aren't accurate enough for a 12-hour brew.
  • A filter — cheesecloth, a coffee filter, a nut milk bag, or a fine-mesh sieve. The brew gets strained twice, so layered filtration helps.
  • A storage container — a glass bottle or pitcher with a lid. The brew lives in the fridge for up to two weeks.
  • Fresh whole-bean coffee — within four to six weeks of roast date. Cold brew is more forgiving with slightly older coffee than hot brew is, but freshness still helps.

The standard cold brew recipe

This is the recipe to start with. It produces a smooth 1:8 concentrate that dilutes 1:1 for about six 8 oz servings of finished coffee. Once it's consistent, vary one variable at a time — ratio, grind, steep time — to find your preference.

Variable Value
Coffee 100 g, coarse grind
Water 800 g, cold or room temperature
Ratio 1:8
Steep time 16 hours (fridge) or 12 hours (room temp)
Yield Roughly 700 g concentrate, makes 6 servings diluted

Step-by-step

  1. Weigh and grind the coffee. 100 g of whole beans, ground to a coarse setting — about the texture of kosher salt or breadcrumbs. Cold brew tolerates a slightly coarser grind than French Press because the long steep makes up for less surface area.
  2. Combine coffee and water in the vessel. Add the grounds first, then pour 800 g of cold or room-temperature filtered water on top. The water level should leave at least an inch of headspace at the top of the jar.
  3. Stir gently to fully saturate the grounds. A spoon or chopstick is fine. You want every ground wet — dry pockets won't extract. Stir for about thirty seconds.
  4. Seal and steep. Put the lid on and place the jar in the fridge for sixteen hours, or leave it at room temperature for twelve. Fridge steep is slower and produces a slightly sweeter, smoother cup; room-temp steep is faster and slightly more intense.
  5. First strain — coarse. Pour the brew through a fine-mesh sieve into a clean container to remove the bulk of the grounds. Don't press or squeeze the grounds — that pushes fines and bitter compounds into the cup.
  6. Second strain — fine. Pour the once-strained brew through a coffee filter, cheesecloth, or a nut milk bag into your storage vessel. This pass catches the silt and produces a clean, clear concentrate.
  7. Store and serve. Seal the storage bottle and refrigerate. To serve, pour 4 oz of concentrate over a tall glass of ice, then top with 4 oz of cold water or milk. Keeps in the fridge for ten to fourteen days.

Pro tips for each step

  • If the brew tastes flat, your coffee was probably stale (older than six weeks since roast). Cold brew can mask stale coffee for a while, but it eventually shows up as a hollow, cardboard note.
  • If the brew is muddy, the second strain wasn't fine enough. A coffee filter over a sieve takes longer but produces a noticeably cleaner cup.
  • If the brew is too strong, dilute more aggressively (try 1:1.5 with water) or shorten the next steep to twelve hours.
  • If the brew is too weak, extend the next steep to eighteen to twenty hours, or tighten the ratio to 1:6.

Best Doctopus coffees for cold brew

Cold brew flatters medium-to-medium-dark roasts with chocolate, nut, and caramel notes. Very light, fruit-forward roasts can taste muted in cold brew — the cold extraction strips out the bright acidity that makes them shine in pour over or AeroPress. Three picks from our current lineup:

  • Cerrado Catuai — Brazil natural. Cocoa, nut, mellow acidity, full body. The textbook cold brew bean — sweet, smooth, and forgiving. Start here. Brew at the 1:8 standard ratio.
  • Argelia Cauca — Colombia washed, women producers. Toffee, balanced sweetness, soft acidity. A lighter, cleaner cold brew with caramel sweetness. Excellent with a splash of milk. 1:8 standard.
  • Dembi Sidama — Ethiopia natural. Berry, sweet, wine-like complexity, dark chocolate finish. An adventurous cold brew — the natural process keeps enough sweetness that the fruit comes through cleanly. Try at 1:7 for a more concentrated, wine-like cup.

Whichever you choose, cold brew rewards giving the coffee a couple of weeks past the roast date. Coffees that are too fresh (less than seven days off-roast) can taste yeasty in cold brew because of CO₂ still degassing. Two to four weeks past roast is the sweet spot.

Five cold brew recipes

The standard 1:8 concentrate is the most common cold brew you'll make. These four variations cover the other styles people most often ask about.

Recipe 1: Classic concentrate (1:8)

The recipe above. 100 g coffee + 800 g water, sixteen-hour fridge steep, dilute 1:1 with water or milk. Yield is roughly six 8 oz drinks.

Recipe 2: Ready-to-drink cold brew (1:12)

75 g coffee + 900 g water, eighteen-to-twenty-four-hour fridge steep, drink straight from the fridge with ice. No dilution step. The slightly longer steep makes up for the looser ratio. Useful if you want grab-and-go cold brew rather than a concentrate-and-mix workflow.

Recipe 3: Japanese-style (flash brew)

Technically not cold brew but worth mentioning. Brew a regular pour over at half-strength (e.g., 20 g coffee, 150 g hot water), then drip directly onto 150 g of ice in the carafe. The hot brew flash-chills as it hits the ice, locking in the bright, floral notes of light roasts. The cup keeps the clarity of a pour over but is fully cold. Best for a single serving — a glass-by-glass alternative when you don't want to commit to a 16-hour brew.

Recipe 4: Nitro cold brew at home

Make a 1:8 cold brew concentrate. Charge a whipped-cream dispenser (iSi or similar) with the concentrate and one N₂ charger (not CO₂ — N₂ is what creates the cascading cream-stout texture). Shake, chill, then dispense over ice. The result is the cascading, creamy nitro cold brew you'd pay $6 for at a café. Equipment is the splurge — the recipe itself is unchanged from the standard concentrate.

Recipe 5: Cold brew old fashioned

1 oz cold brew concentrate, 2 oz bourbon, 0.25 oz simple syrup, 2 dashes orange bitters. Stir with ice, strain over a single large rock, orange-peel garnish. The cold brew concentrate substitutes for the typical sugar cube + bitters base in an old fashioned and adds bittersweet chocolate depth. Worth trying once.

Cold brew in gear you already own

You don't need a dedicated cold brew maker. The standard 1:8 recipe works in almost anything that seals.

Cold brew in a French Press

The French Press might be the easiest cold brew vessel you already own. Use the same 1:8 ratio — 100 g coarsely ground coffee + 800 g room-temperature water in a 34 oz (8-cup) press. Stir, lid on, plunger up, refrigerate twelve to sixteen hours. Press slowly. The metal mesh on the plunger does double duty as the first strain; you can skip straight to the second filter pass or, if you don't mind a little texture, drink it straight. See the full method on the French Press Coffee Guide.

Cold brew in a mason jar

A 2-quart wide-mouth mason jar is the cheapest cold brew setup you can buy. Add coffee, add water, screw the lid on, leave on the counter or in the fridge, then strain through cheesecloth or a coffee filter. Total cost: $5 for the jar plus $1 for cheesecloth. The disadvantage versus dedicated gear is the straining step is messier — but the brew quality is identical.

Cold brew in a dedicated maker

Toddy, OXO, and Hario all sell purpose-built cold brew systems. They're worth it if you make cold brew weekly: built-in filtration means no separate straining step, dedicated storage carafes go straight to the fridge, and capacity is sized for batch brewing. The Hario Mizudashi (filter-in-bottle) is the simplest of the three. See the deep dive on the Hario Cold Brew Guide.

Cold brew troubleshooting

Bitter cold brew

  • Steep time too long — try twelve hours instead of twenty-four.
  • Grind too fine — use kosher salt texture, not table salt.
  • Coffee too dark — try a medium roast instead of a French or Italian roast.
  • Pressing or squeezing the grounds during strain — let gravity do the work.

Weak or watery cold brew

  • Ratio too loose — tighten to 1:6 or 1:7.
  • Grind too coarse — go down one click on your grinder.
  • Steep time too short — extend to eighteen to twenty hours.
  • Diluting too aggressively at serve time — try splash-of-milk instead of 1:1.

Sour or acidic cold brew

  • Coffee too light-roasted — pick a medium roast with chocolate notes.
  • Under-extracted — extend the steep by four to six hours.
  • Water too cold during steep — try room-temp steep instead of fridge.

Gritty or muddy cold brew

  • Grind too fine — coarsen it.
  • Didn't filter twice — a sieve pass plus a coffee filter pass produces a much cleaner brew.
  • Squeezed the grounds during strain — fines escape into the cup. Let it drip.

Flat or stale cold brew

  • Coffee past its prime — older than six weeks off roast tastes hollow in cold brew.
  • Stored too long after brewing — drink within two weeks; quality drops fast after that.
  • Stored uncovered — cold brew picks up fridge odors quickly. Seal the bottle.

Cold brew FAQ

How long does cold brew last in the fridge?

Ten to fourteen days in an airtight container. After two weeks the flavor starts to flatten, but it's still safe to drink — just less enjoyable. Diluted cold brew (concentrate plus water or milk) keeps for two to three days before tasting stale.

Can you heat up cold brew?

Yes, and it's a useful trick when the weather turns. Pour concentrate over hot water 1:1 instead of cold, and you get a smooth, low-acid hot coffee. Some bitterness can emerge as the brew warms, so dilute a touch more aggressively than you would for iced.

How much caffeine is in cold brew?

A 1:1 diluted 8 oz cold brew has roughly 150–200 mg of caffeine — more than the typical 95 mg in hot drip coffee, because cold brew is concentrated. Drinking the concentrate undiluted doubles that.

Can you make cold brew in a French Press?

Yes — see the French Press Coffee Guide. Use the same 1:8 ratio (100 g coarse coffee + 800 g room-temperature water), steep twelve to sixteen hours in the fridge, then press slowly. The metal mesh handles the first strain.

What grind size is best for cold brew?

Coarse — about the texture of kosher salt or breadcrumbs. A long steep doesn't need a fine grind, and fines make the second strain much harder. If you've already dialed in a French Press grind on your burr grinder, that setting works for cold brew too.

Is cold brew less acidic than hot coffee?

Yes, meaningfully. Cold water extracts roughly two-thirds of the chlorogenic acids that hot water extracts, leaving a smoother cup. The sweetness from sugars and the body from oils stays largely intact, which is why cold brew tastes both smoother and richer than the same beans brewed hot.

Do you have to refrigerate while steeping?

No. Room-temperature steep works fine and is slightly faster (twelve hours instead of sixteen). The cup is a touch more intense, sometimes slightly more acidic. Fridge steep is the gentler option and is what we recommend if your kitchen runs warm.

What's the best coffee for cold brew?

Medium-to-medium-dark roasts with chocolate, nut, or caramel notes. From our lineup, Cerrado Catuai is the textbook pick — Brazilian natural process, cocoa-forward, smooth. For more depth, Dembi Sidama is an Ethiopian natural with fruit and dark-chocolate character that holds up beautifully cold.

Dive deeper into cold brew

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