To make cold brew concentrate, steep coarsely ground coffee in cold water for 12 to 18 hours, then strain it. A good starting ratio is 1 part coffee to 5 parts water by weight. You end up with a strong, smooth coffee base. Dilute it with water, milk, or ice when you’re ready to drink it.
This guide gives you exact measurements, step-by-step directions, dilution ratios, and fixes for common problems. The amounts below are suggested starting points, so adjust them to your taste.
What Is Cold Brew Concentrate?
Cold brew concentrate is cold brew made with more coffee per cup of water than a ready-to-drink batch. Because it is strong, you mix it with water or milk before drinking. One batch gives you several drinks.
Concentrate has two practical benefits. It takes up less fridge space than a big pitcher of diluted cold brew. And you control the strength of each cup.
Cold Brew Concentrate Recipe
Time: 10 minutes of hands-on work, plus 12–18 hours of steeping Makes: about 2½ cups (600 ml) of concentrate, or about 5 servings once diluted 1:1
Equipment
Ingredients
Instructions
- Grind your coffee coarse. The grounds should look like coarse sea salt. Fine grounds make bitter, cloudy cold brew.
- Combine coffee and water. Put the grounds in your jar. Pour in the cold water slowly.
- Stir gently. Make sure all the grounds are wet. Scrape down any dry clumps on the sides.
- Cover and steep. Leave the jar on the counter or in the fridge for 12 to 18 hours.
- Strain once. Pour the mixture through a fine-mesh strainer into a clean container. Don’t press on the grounds. Pressing pushes out bitter, silty flavors.
- Strain again. Pour the coffee through a paper filter or cheesecloth to remove fine sediment. This step is slow, so be patient.
- Store. Pour the concentrate into an airtight bottle and refrigerate.
Cold Brew Concentrate Ratio
Ratios change how strong the concentrate is. Here is how common ratios compare, by weight of coffee to water:
| Ratio (coffee : water) | Strength | Best for |
|---|---|---|
| 1:4 | Very strong | Mixing with lots of milk or ice |
| 1:5 | Strong, balanced | A good all-purpose starting point |
| 1:8 | Closer to ready-to-drink | Sipping with a small splash of water |
Water ratio matters, but so does time. Steeping longer pulls more from the coffee, which can make the flavor heavier or more bitter. If your first batch tastes too harsh, shorten the steep before changing anything else.
How Long to Steep Cold Brew Concentrate
Most home recipes steep for 12 to 24 hours. Here is a simple way to think about it:
Steeping in the fridge is slower than steeping on the counter. If you use the fridge, lean toward the longer end of the range. Try one batch at 12 hours and one at 18 hours, and see which you prefer.
How to Dilute Cold Brew Concentrate
Never drink concentrate straight unless you want a very strong shot. Start with a 1:1 mix of concentrate and cold water, then adjust.
Pour it over ice, taste it, and add more water or concentrate as needed. Remember that ice melts and dilutes the drink as you sip.
For example, with ½ cup (120 ml) concentrate, add ½ cup (120 ml) cold water and a handful of ice.
What Coffee Beans and Grind Work Best?
Medium or medium-dark roasts are a common choice for cold brew. They tend to taste smooth, chocolatey, and nutty when brewed cold. Light roasts can taste more fruity and tangy, so use them if you like a brighter cup.
Grind size matters more than most people expect. Coarse is the right choice. If you buy pre-ground coffee, look for a coarse or French press grind. Fresh whole beans ground at home usually taste better.
Common Cold Brew Problems and Fixes
It tastes bitter. The grind may be too fine, or the steep may be too long. Try a coarser grind and shorten the steep by a few hours.
It tastes weak or watery. You may have used too little coffee, or you may have over-diluted it. Use a stronger ratio like 1:4, or start with less water when you serve it.
It tastes sour or flat. The steep may have been too short, or the grind may be too coarse. Steep a few hours longer next time.
It’s cloudy or has sediment. Fine grounds slip through the first strainer. Strain a second time through a paper filter or cheesecloth. A coarser grind helps too.
How to Store Cold Brew Concentrate
Keep concentrate in a clean, airtight container in the refrigerator. For the best flavor, plan to finish it within about a week. Some sources say it can last up to two weeks, but taste fades over time.
Always use a clean jar and clean utensils. If it smells sour, off, or musty, throw it out. Don’t store diluted cold brew with milk for long. Milk spoils sooner than plain concentrate, so add milk only when you serve.
Ways to Use Cold Brew Concentrate
Frequently Asked Questions
Q01. Is cold brew concentrate the same as regular cold brew? Not quite. Both are made the same way, but concentrate uses more coffee per cup of water. That means you dilute it before drinking.
Q02. Can I make cold brew concentrate without a kitchen scale? Yes. Use about 1 cup of coarse grounds for every 2 cups of water as a rough guide. A scale is more accurate because grounds vary in weight.
Q03. Should I steep cold brew in the fridge or on the counter? Either works. The counter is faster. The fridge is slower and keeps the coffee cold the whole time. If you steep in the fridge, aim for the longer end of the time range.
Q04. Why is my cold brew concentrate so strong? That’s what a concentrate is. If it’s too strong for your taste, dilute it more or use a lower coffee-to-water ratio next time.
Recipe card summary
- Yield: about 2½ cups concentrate (about 5 diluted servings)
- Prep time: 10 minutes
- Steep time: 12–18 hours
- Ingredients: 200 g coarse coffee grounds, 1,000 g cold filtered water
- Method: Combine, stir, steep, strain twice, refrigerate. Dilute 1:1 to serve.
