Cold brew coffee is one of the smoothest, strongest, and most refreshing ways to enjoy coffee — and it takes almost no effort to make at home. Unlike hot brewed coffee, cold brew is never exposed to heat, which means it comes out naturally sweet, low in acidity, and never bitter.
In this guide, you’ll learn exactly how to make cold brew coffee at home, the right ratio to use, how long to steep it, and the best beans to choose.
What Is Cold Brew Coffee?
Cold brew coffee is made by steeping coarsely ground coffee in cold or room-temperature water for 12 to 24 hours. The result is a concentrated coffee extract that you dilute before drinking.
The key difference between cold brew and iced coffee is how each is made:
- Iced coffee is hot-brewed coffee poured over ice. It’s quick but often tastes watered down and acidic.
- Cold brew is steeped in cold water from the start. No heat, no acidity spike, and no bitterness.
The slow, cold extraction process draws out different chemical compounds than hot brewing. Cold brew has up to 67% less acidity than hot coffee, making it a better option for people with sensitive stomachs or acid reflux.
Cold Brew Coffee Ratio: The Numbers That Matter
The most important variable in cold brew is the coffee-to-water ratio. Get this right and everything else falls into place.
For concentrate (recommended):
- 1 cup (4 oz / 113g) coarsely ground coffee
- 4 cups (32 oz / 950ml) cold filtered water
- Ratio: 1:4
This makes a concentrate you dilute 1:1 with water or milk before drinking.
For ready-to-drink cold brew:
- 1 cup (4 oz / 113g) ground coffee
- 8 cups (64 oz / 1900ml) cold filtered water
- Ratio: 1:8
Most people prefer making concentrate because it lasts longer in the fridge and gives you more flexibility.
How to Make Cold Brew Coffee at Home (Step-by-Step)
You don’t need special equipment. A mason jar, a fine mesh strainer, and a coffee filter are all you need.
What you need:
- Coarsely ground coffee
- Cold filtered water
- Large mason jar or pitcher (64 oz)
- Fine mesh strainer
- Coffee filter or cheesecloth
Instructions:
- Grind your coffee coarsely. You want it roughly the size of raw sugar. A coarse grind extracts slowly and cleanly. Fine grind = bitter, cloudy cold brew.
- Combine coffee and water. Add 1 cup of ground coffee to your container. Pour 4 cups of cold filtered water over it. Stir gently to ensure all grounds are wet.
- Cover and steep. Cover the jar loosely and let it sit at room temperature for 12–18 hours, or in the fridge for 18–24 hours. Room temperature steeps faster; the fridge produces a slightly smoother cup.
- Strain the coffee. Pour the mixture through a fine mesh strainer lined with a coffee filter. This takes 3–5 minutes. Don’t press or squeeze the grounds — this adds bitterness.
- Dilute and serve. Mix 1 part concentrate with 1 part water or milk over ice. Adjust to taste.
Your cold brew concentrate keeps in the refrigerator for up to 2 weeks.
What’s the Best Coffee for Cold Brew?
Any coffee works for cold brew, but some varieties shine more than others.
Best roast for cold brew: Medium to dark roast. Dark roasts bring out chocolate, caramel, and nutty notes that taste incredible when cold. Light roasts produce a fruity, bright result — also great if you prefer that.
Best beans for cold brew: Single-origin beans from Colombia, Brazil, or Guatemala tend to work very well. They’re naturally sweet and low in acidity even before the cold brew process amplifies those qualities.
For the best results at home, a burr grinder lets you dial in a consistent coarse grind. The OXO BREW Conical Burr Coffee Grinder is a popular choice that produces consistent coarse grounds every time. As an Amazon Associate I earn from qualifying purchases.
How to Serve Cold Brew Coffee
Cold brew is extremely versatile. Here are the most popular ways to drink it:
- Straight over ice: Dilute 1:1 with water, pour over a glass packed with ice. Clean and simple.
- Cold brew latte: Dilute with oat milk or whole milk instead of water. Rich and smooth.
- Nitro cold brew: Infuse cold brew with nitrogen gas (using a whipped cream dispenser) for a creamy, stout-like texture.
- Cold brew tonic: Mix 3 oz concentrate with 4 oz tonic water over ice. Surprisingly refreshing.
- Sweet cold brew: Add a splash of vanilla syrup or caramel syrup before adding the cold brew.
Cold Brew vs Iced Coffee: Which Is Better?
| Cold Brew | Iced Coffee | |
|---|---|---|
| Acidity | Very low | Higher |
| Bitterness | Very low | Can be bitter |
| Caffeine (concentrate) | Higher | Lower |
| Prep time | 12–24 hours | 5 minutes |
| Taste | Smooth, sweet | Bright, familiar |
| Cost (homemade) | ~$0.50/cup | ~$0.30/cup |
Cold brew wins on flavor and stomach-friendliness. Iced coffee wins when you need caffeine right now.
Common Cold Brew Mistakes (and How to Fix Them)
Too bitter: Your grind is too fine, or you steeped too long. Use coarser grounds and reduce steep time to 12 hours.
Too weak: You steeped too short or used too little coffee. Increase the coffee-to-water ratio or steep for the full 18–24 hours.
Cloudy cold brew: You squeezed the grounds during straining or used fine grounds. Let it drain naturally and use coarser grounds next time.
Tastes flat or dull: Your coffee was stale. Use freshly ground coffee — within 2 weeks of the roast date is ideal.
Frequently Asked Questions About Cold Brew Coffee
How much caffeine is in cold brew?
Cold brew concentrate has more caffeine than regular coffee — roughly 200mg per 8 oz serving when diluted 1:1. When diluted further, the caffeine drops accordingly.
Can I heat cold brew coffee?
Yes. You can warm diluted cold brew gently on the stove — it makes an unusually smooth hot coffee. Don’t boil it, as high heat reverses some of the smoothness benefits.
Is cold brew stronger than regular coffee?
Cold brew concentrate is much stronger. Once diluted to a normal drinking ratio (1:1), the caffeine is similar to a strong cup of hot coffee.
How long does cold brew last?
Cold brew concentrate keeps in the fridge for up to 2 weeks. Once diluted, drink it within 3–4 days.
Do I need a cold brew maker?
No. A mason jar, strainer, and coffee filter are all you need. Dedicated cold brew makers are convenient but entirely optional.
Cold brew coffee is one of the easiest upgrades you can make to your coffee routine. Once you make it at home, you’ll wonder why you ever paid $6 for a bottle at the store.
If you’re new to cold coffee drinks, also check out our guide to the iced latte recipe and the iced americano recipe — two quick alternatives for hot days.
