Cold brew concentrate ratio and serving guide

For a 950 ml (32-ounce) mason jar, use 150 grams of coarsely ground coffee and 600 grams of cold water, which is a 1:4 cold brew concentrate ratio by weight. Steep it 14 to 18 hours, strain it, and the jar in your fridge makes iced coffees, hot coffees, and almost-lattes for several days. Making concentrate instead of ready-to-drink cold brew is the move that saves fridge space and gives every person in the house their preferred strength.

Concentrate vs. regular cold brew

Regular cold brew runs at a 1:8 to 1:10 ratio and you drink it straight (the cold brew coffee ratio guide covers those amounts). It works, but a jar of it takes up the same fridge space as concentrate and makes fewer cups. Concentrate at 1:4 is roughly twice as strong, so the same jar goes twice as far. You dilute it 1:1 when you pour, which also means two people who disagree on coffee strength can both be right without making separate batches.

The taste is different too. The higher coffee-to-water ratio pulls more chocolate and caramel out of the grounds and produces a thicker body. Diluted to drinking strength, it still tastes smoother and less acidic than hot coffee cooled down, because cold water skips the bitter and acidic compounds that hot water extracts aggressively. Concentrate also wins on the math, and the taste is richer after dilution.

The ratio in practice

For a standard 950 ml (32-ounce) mason jar: 150 grams of coffee, 600 grams of water, 1:4 ratio. If the result is too intense even after diluting 1:1, back off to 1:5 next time: 120 grams of coffee to 600 grams of water.

Grind coarse. The texture of raw sugar or breadcrumbs. Too fine and the concentrate comes out muddy, over-extracted, and hard to filter. A French press grind setting works. Pre-ground drip coffee from a bag is finer than ideal but still produces a drinkable result, just harsher and grittier.

Stir the grounds into the water until everything is wet. Dry clumps floating on top do not extract evenly. Cover the jar and leave it at room temperature or in the fridge. Room temperature steeps faster and produces a slightly richer, fuller result. Fridge steeping is more forgiving because the cold slows extraction, making it harder to over-steep. If you tend to forget about it for 20 hours, fridge steeping is your friend.

Steep time

Fourteen to eighteen hours. Under twelve and the concentrate tastes thin and grassy. Over twenty-four and bitterness creeps in, especially at room temperature.

The easiest routine: start the batch after dinner, strain it the next morning. That lands around fourteen to sixteen hours without needing a timer or an alarm. It fits into the evening cleanup and becomes one of those things you just do, like setting the coffee maker for the morning except the payoff is better.

Straining and storage

Strain through a fine mesh sieve first to catch the bulk, then pass the liquid through a paper coffee filter in a funnel to remove fine sediment. The paper filter step is optional. You can skip it if you do not mind a slightly gritty texture, but it produces a cleaner concentrate that keeps longer without developing off flavors.

Transfer to a clean jar with a lid. It keeps in the refrigerator for up to two weeks. The flavor shifts over that span: the first few days are the brightest, and by the end of the second week the taste rounds off and dulls. At a glass a day, one batch lasts four or five days, so freshness is rarely a concern in practice.

Diluting and serving

Standard dilution is 1:1 with water, milk, or ice. Pour concentrate over ice and add your liquid. The ice melts and dilutes it further, so starting slightly strong works in your favor during summer.

For something creamy without an espresso machine: concentrate at a 1:2 ratio with milk is close to an iced latte. Add simple syrup or a splash of cream if that is your style.

Heated concentrate works too. Dilute 1:1 with hot water and you have a fast, smooth cup that is less acidic than a drip brew. It will not taste exactly like a fresh pour over, but on a morning when you need coffee in thirty seconds it is a solid cup that earns its place in the morning.

Scaling up

The ratio scales linearly. For a two-liter pitcher, double everything: 300 grams of coffee to 1,200 grams of water at 1:4. Steep time stays the same. The only thing that changes is straining takes longer because there is more liquid to pass through the filter, so add an extra ten minutes.