Cold brew gets easier the moment you decide what you want in the glass. Do you want coffee you can pour straight over ice, or a concentrated base that you will soften with water or milk? Those are two different recipes, and confusing them is why one batch tastes weak while another feels too intense. Start with the recipe that fits your routine, then make one small adjustment at a time.
This guide uses weight because it is repeatable. A simple kitchen scale turns “a scoop or two” into a recipe you can make again next week. You do not need special gear, a dedicated cold-brew maker, or a complicated ritual. You need a jar or pitcher, coarse coffee, water, a way to strain it, and enough patience to let time do the work.
Choose your cold brew ratio first.
A ratio tells you how much coffee to use for a given amount of water. For cold brew, there is no single magic number because a ready-to-drink batch and a concentrate are meant to be served differently. The Specialty Coffee Association describes cold brew as a long, slow, usually immersion-style brew that can run from four to 24 hours. Their sensory work used a much stronger 5:1 brew for tasting comparisons, which is a useful reminder that the recipe should match the job you want the coffee to do.
Ready to drink: 1:12, or 75g coffee to 900g water. Pour it over ice and taste. Concentrate: 1:5, or 100g coffee to 500g water. Dilute the finished concentrate with roughly equal parts water or milk, then adjust from there.
A ready-to-drink recipe is lower effort at serving time. Make it, strain it, and pour. A concentrate takes more coffee but gives you a smaller, flexible bottle that can become a strong iced coffee, a milk drink, or a drink with extra water. Blue Bottle’s Hario cold-brew guidance lands near 1:13.6 for a lighter, ready-to-drink result, while its New Orleans-style concentrate uses roughly 1:5.3. Those two useful endpoints explain why cold-brew advice can seem contradictory when it is really answering two different questions.
Use a coarse, even grind.
Cold water moves slowly through coffee. A coarse grind gives the water room to circulate and makes filtering easier. Think raw sugar or coarse sea salt, not powder. A fine grind can make the final drink muddy and harder to strain, especially when you are using a simple filter or French press. It can also keep extracting through the filter bed and leave a dry, overly heavy finish.
If you buy pre-ground coffee, ask for a coarse grind for cold brew or French press. If you grind at home, choose a coarse setting and keep it steady for the first batch. Once you like the strength, the grind is the next variable to explore. Our coffee grind size chart gives you a clear reference for that part of the process.
Make a ready-to-drink batch in five simple steps.
- Weigh 75 grams of coarse coffee. Add it to a clean jar, French press, or pitcher.
- Add 900 grams of cold, filtered water. That is about 30 fluid ounces, but weighing the water keeps the recipe more accurate.
- Stir gently until the grounds are wet. You are not trying to whip air into the coffee. Just make sure no dry pockets float on top.
- Cover and refrigerate for 14 to 16 hours. Overnight works beautifully. Start the batch after dinner and it is ready to strain in the morning.
- Strain slowly and taste over ice. A French press makes the first pass easy. For a cleaner cup, pour it through a paper filter after that.
Do not press or squeeze the wet grounds aggressively. Let gravity do most of the work. Pressing hard can push fine particles and astringent flavors through the filter. If the brew tastes a little stronger than you expected, add a splash of cold water in the glass instead of discarding the batch. That small correction tells you what to change next time.
Make a concentrate when you want options.
For concentrate, combine 100 grams of coarse coffee with 500 grams of water. Steep it covered in the refrigerator for 14 to 16 hours, then strain. The finished coffee will be intentionally dense. Start by mixing one part concentrate with one part water or milk over ice. If it feels too bold, add more liquid. If it fades behind milk or melting ice, use less dilution.
Concentrate is useful when more than one person drinks coffee differently. One person can make an iced black coffee, another can add oat milk, and someone else can warm a portion with hot water for a gentler drink. The batch stays flexible without making three separate brews. The Specialty Coffee Association’s discussion of concentrates also notes that cold brewing slows the process and can help avoid over-extraction. That is a good reason to make your first adjustment to ratio before trying to extend the steep far beyond a day.
| What you want | Starting ratio | Example batch | How to serve |
|---|---|---|---|
| Ready to drink | 1:12 | 75g coffee, 900g water | Pour over ice. Add a splash of water only if needed. |
| Light, ready to drink | 1:14 | 65g coffee, 900g water | Pour over ice or drink straight from the fridge. |
| Concentrate | 1:5 | 100g coffee, 500g water | Mix about 1:1 with water or milk, then taste. |
Scale the batch without starting over.
Once you find a ratio you like, the math stays friendly. For a ready-to-drink 1:12 batch, divide the water weight by 12 to find the coffee dose. If your jar holds 600 grams of water, use 50 grams of coffee. If you want a larger 1,200-gram batch, use 100 grams of coffee. The recipe grows with the container, so you do not have to relearn it every time you make coffee for guests or reset your weekly routine.
For concentrate, divide the water weight by five. A 750-gram water batch calls for 150 grams of coffee. This can sound like a lot until you remember that you will dilute it at serving time. The finished bottle is not the final drink. It is a base that gives you room to add cold water, milk, ice, or a little sweetness without losing all of the coffee flavor.
Use a vessel with some headroom. Grounds swell and rise when they first meet water, especially in a narrow jar. Stir gently after adding the water, wait a minute, then check that the coffee is fully wet. That small pause helps you avoid a dry raft of grounds that never joins the brew. A wide-mouth jar, a large French press, or a simple covered pitcher all work well.
If you are making a first batch, resist the urge to fill the biggest container in the house. A one-liter recipe is generous enough to learn from but small enough that you will not be stuck with a whole week of a coffee you do not enjoy. When you find your favorite, scale it up with the same ratio and write it down. That is much more useful than trying to memorize tablespoons in the morning.
Steep for flavor, not for a timer.
Fourteen to 16 hours in the refrigerator is a sensible first try. It gives the coffee enough time to become full and smooth without asking you to guess at an extreme. A longer steep is not automatically stronger in a helpful way. If the brew is watery, use more coffee at the same time before changing everything. If it tastes woody, dusty, or drying, use less time or a coarser grind on the next batch.
Cold brew is also not simply iced coffee. Iced coffee is usually hot coffee cooled with ice. Cold brew starts with cold or room-temperature water and uses time instead of heat. The two can both be excellent, but they will not taste identical and should not use the same recipe. If you want a bright, freshly brewed cup that cools quickly, make a hot brew a little stronger and pour it over ice. If you want a make-ahead batch with a softer texture, cold brew is the better fit.
Fix the next batch with one change.
Too weak: use a little more coffee, such as moving from 1:12 to 1:10. Keep the time and grind the same. Too strong: dilute the glass first, then use a little less coffee next time. Muddy: grind coarser and add a paper-filter pass. Harsh or woody: shorten the steep by two hours or grind a touch coarser. Flat: make sure the coffee is fresh and use filtered water you would happily drink on its own.
It is tempting to change ratio, grind, steep time, and dilution all at once. That makes it impossible to tell what fixed the problem. A better habit is to make one note after the first glass: stronger, lighter, cleaner, sweeter, or more body. Then give the next batch one clear job. The same method works across coffee styles, and our coffee ratio guide can help when you are working with hot coffee too.
Start with a coffee you would enjoy hot.
There is no need to hunt for a coffee labeled only for cold brew. Start with a coffee whose flavor direction you already like. For a comforting, fuller cup, Cowboy Blend is a natural place to begin. For a deeper, cocoa-led profile, Bali Blue gives you another good option. If you are still learning what you like, the coffee sampler guide can help you compare several directions before settling into a routine.
Use the same coffee for two or three batches while you find your preferred ratio. Once the recipe feels dependable, switch coffees and notice what changes. You may find that a darker, chocolatey coffee feels best with milk, while a brighter single origin shines with only ice and a splash of water. That is when cold brew becomes more than a shortcut. It becomes a simple way to learn your own taste.
Keep the routine simple.
Choose ready-to-drink or concentrate. Start at 1:12 or 1:5. Grind coarse, steep overnight, strain gently, and taste before changing anything. A good cold-brew recipe is not a rule you have to follow forever. It is a reliable place to begin.
When you have a batch you like, write the recipe on the jar or save it in your phone. The next glass will be easier, and you will have a clearer way to explore the coffees in the BrewSumthin! coffee collection. That is the real advantage of a ratio: not perfection, just a cup you can make again on purpose.
