Guide Cold Brew Recipe: Ratios, Steps and Tips for Smooth Coffee

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This guide cold brew recipe walks you through making a batch of cold brew at home using nothing more than coarsely ground coffee, cold water, time, and a filter. You will get a concentrate or ready-to-drink coffee with a smooth, chocolatey body and far less bitterness than hot-brewed coffee served over ice. The method takes about 15 minutes of hands-on work, and the rest is patience.

What Cold Brew Is and Why the Recipe Works

Cold brew is coffee extracted in cold or room-temperature water over a long period, usually 12 to 24 hours. Heat pulls flavor compounds out of coffee quickly, and it also pulls out some of the sharp, sour, and bitter notes that many people find harsh. Cold water extracts more slowly and more selectively. The result tends to taste sweeter and rounder, with less acidity on the tongue.

That slow extraction is the reason the recipe is so forgiving. You are not chasing a precise two-to-three-minute window the way you would with a pour-over. Instead, you control three variables: the coffee-to-water ratio, the grind size, and the steep time. Get those three right and the rest falls into place.

Gear You Need Before You Start

You do not need specialty equipment, but a few basics make the process cleaner and more consistent.

• A digital kitchen scale that reads in grams
• A burr grinder, set to coarse
• A large glass jar, pitcher, or food-safe container with a lid (1 to 2 liters works well for a batch)
• Filtered or good-quality tap water
• A fine-mesh strainer lined with a paper coffee filter, or a nut-milk bag or cheesecloth for a first pass
• A second container for the finished coffee, plus a clean funnel if you need one

If you want a dedicated system with a built-in filter, a purpose-made cold brew maker can simplify the straining step. We compare a few options in Best Cold Brew Makers for Home: 3 Cold Brew Makers Compared.

Step-by-Step Cold Brew Recipe

The steps below make a concentrate-style batch from a 100-gram dose of coffee. Adjust the quantities proportionally if you want more or less.

Step 1: Choose and Weigh Your Coffee

Medium to dark roasts are the traditional choice for cold brew because they produce chocolate and nutty notes that hold up well when served cold. Lighter roasts can work too, but they often need a longer steep to develop sweetness and body. Weigh out 100 grams of whole beans. If you buy pre-ground coffee, skip the grinding step, but know that pre-ground coffee is usually sold for hot brewing and may be too fine for a clean filter.

Step 2: Grind Coarse

Grind to a coarse setting, close to the texture of sea salt or coarse sand. Fine grounds pass through filters, cloud the final drink, and over-extract during a long steep, which leads to muddy, bitter cups. For a full breakdown of how grind size affects different brewing methods, see Coffee Grind Size by Brew Method: A Practical Chart.

Step 3: Combine Coffee and Water at the Right Ratio

Place the ground coffee in your container and add 500 grams of cold, filtered water. That gives you a 1:5 ratio, which is a common starting point for a concentrate. Stir gently until every grind is saturated. Some grounds will float; press them under the surface with a spoon so they wet evenly.

Step 4: Steep

Cover the container and steep it. You have two reliable options:

• Room temperature: 12 to 18 hours on the counter, out of direct sunlight.
• Refrigerator: 18 to 24 hours, which slows extraction and gives a cleaner, slightly lighter cup.

Start with the lower end of the range and taste a small sample. If it tastes flat or weak, steep longer next time. If it turns harsh or woody, shorten the steep or go coarser.

Step 5: Strain the Concentrate

Set a fine-mesh strainer over a clean container and line it with a paper filter. Pour the coffee slowly through the filter. Expect this to take 10 to 20 minutes, since paper filters slow down quickly with fine particles. If the flow is very slow, you can do a first pass through cheesecloth or a nut-milk bag to remove the bulk of the grounds, then filter again through paper for a clearer result.

Step 6: Dilute and Serve

Concentrate is strong on purpose. Dilute it before drinking. Most people mix roughly one part concentrate with one to two parts water, milk, or a milk alternative, then add ice. Taste as you go. You can also dilute to a ready-to-drink strength at the start if you prefer a simpler workflow.

Ratios, Steep Times, and Dilution at a Glance

Once you have made one batch, you can adjust the recipe with confidence. The table below lists three common approaches.

Recipe numbers are starting points. Coffee varies in density, roast level, and grind consistency, so treat the ratio as a dial rather than a rule.

Factors That Change the Flavor

Grind Consistency

Uniform grounds extract evenly. Blade grinders produce a mix of boulders and dust, and the dust over-extracts while the boulders stay underdone. A burr grinder gives you a more consistent particle size, which makes the cup more predictable from batch to batch.

Water Quality

Coffee is mostly water, so water quality matters. Filtered water tends to taste cleaner than heavily chlorinated tap water. Avoid distilled water, which can taste flat, and very hard water, which can make the cup taste chalky.

Roast Level

Darker roasts give heavier body and more chocolate notes with lower perceived acidity. Light roasts can taste bright and fruity but may need more coffee, a longer steep, or a slightly finer grind to build body. Start with a medium or medium-dark roast for your first batch.

Temperature

Room-temperature steeping is faster and tends to give a fuller, slightly more developed flavor. Refrigerator steeping is slower and often tastes cleaner and more delicate. Neither is wrong. Pick based on your schedule and taste preference.

Common Mistakes to Avoid

• Grinding too fine. This is the most common cause of muddy, over-bitter cold brew and clogged filters.
• Skipping the weight. Scoops vary widely in how much coffee they hold. Weighing makes each batch repeatable.
• Steeping for days. More time does not always mean more flavor. Past about 24 hours, many people find the cup turns woody or sour.
• Drinking it straight from the strainer at full strength. Concentrate is meant to be diluted. Taste a small amount diluted before you judge the batch.
• Leaving the coffee at room temperature after straining. Once strained, store the concentrate in the refrigerator in a clean, sealed container. Use it within about a week, and keep it away from strong odors.
• Using a single filter pass. Paper filters remove sediment that would otherwise settle at the bottom of your glass and make the drink gritty.

Tips for Better Results

• Write down the grind setting, steep time, and ratio on the container. Small changes are easy to forget.
• Stir once or twice during the first hour of steeping to help the grounds wet evenly. Do not stir repeatedly.
• Try a small test batch of 50 grams before committing to a larger one when you switch beans.
• For a sweeter cup without added sugar, use a bit more coffee or steep a few hours longer rather than adding syrup right away.
• Store whole beans in an airtight container away from heat and light. Grind right before steeping for the best aroma.

For more on how ratio, water, and taste connect across all brewing methods, read How to Brew Better Coffee at Home: Ratio, Water, Taste. If you want a longer walkthrough with extra variations, How to Make Cold Brew Coffee at Home covers more setups.

Recommended Gear

Burr Grinder

A burr grinder produces a consistent coarse grind, which is the single biggest factor in a clean, balanced cold brew. Check price on Amazon

Digital Kitchen Scale

Weighing your coffee and water makes every batch repeatable and lets you change one variable at a time. Check price on Amazon

Cold Brew Maker with Filter

A purpose-built pitcher or dripper with a built-in filter removes the straining step and reduces mess. Check price on Amazon

Paper Coffee Filters

Paper filters catch the fine sediment that a mesh strainer misses, which gives a cleaner final cup. Check price on Amazon

FAQ

How long should I steep cold brew?

Most recipes call for 12 to 18 hours at room temperature or 18 to 24 hours in the refrigerator. Start at the low end and adjust based on taste.

What coffee-to-water ratio should I use?

A common concentrate ratio is 1:5 by weight, and a ready-to-drink ratio is around 1:8. Adjust in small steps until the flavor suits you.

Can I use hot water to speed up cold brew?

Hot water produces a different drink, often closer to iced coffee, and it can extract more bitterness. Traditional cold brew uses cold or room-temperature water and time.

How long does cold brew concentrate last?

Store strained concentrate in a sealed container in the refrigerator and use it within about a week. Discard it if it smells sour or off.

Why does my cold brew taste sour or weak?

Sourness often means the grind is too coarse, the steep is too short, or the roast is very light. Weakness usually points to too little coffee, too much dilution, or a grind that is too coarse to extract well. Adjust one variable at a time.