How to Make Cold Brew Concentrate at Home: A Simple Recipe for Smooth, Strong Coffee

Cold brew concentrate is the secret to a quick, smooth iced coffee or latte without the bitterness of hot-brewed coffee. By steeping coarsely ground coffee in cold water for 12-24 hours, you extract a rich, low-acid concentrate that you can dilute with water or milk. Making it at home is easy, cost-effective, and lets you customize the strength to your taste.

In this guide, we'll walk you through a simple cold brew concentrate recipe, explain the ideal cold brew ratio, and show you how to dilute it for the perfect cup. Whether you're a cold brew newbie or a seasoned pro, these tips will help you achieve barista-level results with minimal effort.

What Is Cold Brew Concentrate?

Cold brew concentrate is a strong, undiluted coffee extract made by steeping coffee grounds in cold water for an extended period. Unlike regular cold brew, which is ready to drink, concentrate is designed to be mixed with water, milk, or ice. It typically has a coffee-to-water ratio of 1:4 or 1:5 (by weight), resulting in a bold, syrupy brew that's perfect for iced lattes or cocktails.

The key benefit of concentrate is versatility. You can make a large batch once and enjoy cold brew all week—just add water or milk to taste. Plus, the cold brewing process reduces acidity and bitterness, giving you a smoother cup even when diluted.

• Use a coarse grind (like sea salt) to avoid over-extraction and sediment.
• A 1:4 ratio (coffee to water) yields a very strong concentrate; 1:5 is more common for balanced strength.
• Steep for 12-24 hours in the fridge—longer steeping increases caffeine and flavor intensity.

The Perfect Cold Brew Ratio for Concentrate

The golden cold brew ratio for concentrate is 1 part coffee to 4 or 5 parts water by weight. For example, use 1 cup (about 100 grams) of coarsely ground coffee to 4 cups (about 800 grams) of cold, filtered water. This produces a concentrate that you'll dilute 1:1 or 1:2 with water or milk when serving.

If you prefer a milder concentrate, try a 1:6 ratio—but remember, you'll need less dilution later. The most important rule is to weigh your coffee and water for consistency. Volume measurements can vary widely depending on grind size and bean density.

• Start with 1:4 if you want a bold concentrate for lattes; 1:5 is great for iced coffee with milk.
• Always use filtered water for cleaner flavor.
• A mason jar like the Round Cold Brew Mason Jar makes steeping and straining easy.

Step-by-Step Cold Brew Concentrate Recipe

1. Grind your coffee beans to a coarse consistency—similar to breadcrumbs. Avoid fine grinds, as they'll make the concentrate muddy and over-extracted. For best results, use a burr grinder. 2. Combine the grounds and cold water in a large jar or pitcher. Stir gently to ensure all grounds are saturated. 3. Cover and let steep in the refrigerator for 12-24 hours. The longer it steeps, the stronger and more caffeinated the concentrate becomes. 4. Strain the mixture through a fine-mesh sieve lined with a coffee filter or a nut milk bag. Discard the grounds. 5. Store the concentrate in a sealed container in the fridge for up to two weeks.

For a truly smooth brew, the Square Cold Brew Mason Jar comes with a built-in filter that simplifies straining. If you're using a standard jar, a reusable cheesecloth works well. Pro tip: double-filter if you notice sediment at the bottom of your concentrate.

• Use a 1:4 ratio for a concentrate that's ready to dilute 1:1 with water or milk.
• Steep for exactly 18 hours for a balanced flavor—less time can taste weak, more can become bitter.
• Strain twice for a crystal-clear concentrate with no grit.

How to Dilute Cold Brew Concentrate

The beauty of concentrate is that you control the final strength. For a standard iced coffee, mix equal parts concentrate and water (or milk) over ice. For a stronger kick, use 2 parts concentrate to 1 part water. If you're making a latte, fill a glass with ice, add 1/2 cup concentrate, and top with milk of your choice.

Taste as you go: start with a 1:1 ratio and adjust. Some people prefer 2:1 (concentrate to water) for a bold black coffee, while others like 1:2 for a lighter sip. You can also sweeten with simple syrup or vanilla before diluting. For a treat, try the Organic Vanilla Cold Brew Coffee Singles—they're pre-portioned for easy concentrate on the go.

• Standard dilution: 1 part concentrate to 1 part water or milk.
• For a stronger cup: 2 parts concentrate to 1 part water.
• Add sweetener directly to the concentrate before diluting for even distribution.

Tips for the Best Cold Brew Concentrate

Use fresh, high-quality coffee beans. Since cold brew highlights subtle flavors, a medium or dark roast with chocolate or nutty notes works beautifully. The Organic Hazelnut Coffee Blend adds a natural sweetness that's perfect for concentrate. Avoid stale beans—they'll taste flat.

Always store your concentrate in an airtight container to preserve freshness. Glass jars are ideal because they don't retain odors. If you're making a big batch, the Transparent Tumbler is a great vessel for serving. And don't forget to label your jar with the brew date—concentrate is best within 10 days.

• Coarse grind is non-negotiable for a clean concentrate.
• Let the concentrate come to room temperature after straining before refrigerating to avoid condensation.
• Experiment with different roasts to find your favorite flavor profile.

Making cold brew concentrate at home is a simple way to enjoy smooth, strong coffee anytime. With the right ratio, a coarse grind, and a patient steep, you'll have a versatile base for iced coffees, lattes, and even cocktails. Adjust the dilution to your taste, and don't be afraid to experiment with different beans and steeping times. Once you master the cold brew concentrate recipe, you'll never go back to store-bought.