Cold Brew Coffee at Home: The Complete Guide
Recipes · 2026-08-13 · 9 min read · by ExpertCocktails Editorial
I started making cold brew at home because I was spending $5 a day on it. That adds up to about $1,800 a year on coffee that takes maybe ten minutes of actual effort to make yourself. The math alone should convince you, but the taste is what keeps you doing it.
Cold brew is not iced coffee. Iced coffee is hot coffee poured over ice, which dilutes it and brings out all the bitter, acidic notes. Cold brew never touches heat. You steep coarse grounds in cold water for 12 to 24 hours, and the result is smooth, naturally sweet, and about 60% less acidic. It also keeps in the fridge for up to two weeks, so you make it once and drink it all week.
What you need
Coarse ground coffee. A French press grind works. If you buy whole beans, grind them on the coarsest setting your grinder has. Fine grounds make the brew muddy and bitter, and they clog whatever you strain through.
Cold filtered water. Tap is fine if your tap water tastes fine on its own. If you wouldn't drink a glass of your tap water straight, use filtered.
A jar, pitcher, or French press. I use a 32-ounce mason jar. Some people buy dedicated cold brew makers, but they are just a jar with a built-in strainer. Save your money.
A fine mesh strainer and a paper filter or cheesecloth for straining. A regular kitchen strainer lets too many fines through.
The ratio
Use 1 cup of coarse ground coffee to 4 cups of cold water. That gives you a concentrate, which is what you want. You dilute it when you drink it — usually half concentrate, half water or milk. Making a concentrate means it stores better and you can adjust strength to taste.
If you want a ready-to-drink strength instead of concentrate, use 1 cup of grounds to 8 cups of water. I prefer the concentrate method because it is more flexible. Some mornings I want it strong, some mornings I want it lighter over ice with oat milk.
Step by step
Put the grounds in your jar. Pour cold water over them slowly. Give it a gentle stir so all the grounds get wet — dry pockets on top won't extract properly. Cover the jar and put it in the fridge.
Wait 16 to 20 hours. Under 12 hours tastes weak and sour. Over 24 hours starts getting bitter and astringent. I usually make it before bed and strain it the next evening, which lands around 18 hours.
Strain through a fine mesh strainer first to catch the big grounds. Then strain again through a paper coffee filter or a double layer of cheesecloth to get the fines out. This second strain is what makes the difference between smooth cold brew and gritty cold brew.
Pour the concentrate into a clean jar or bottle. It keeps in the fridge for 10 to 14 days.
How to serve it
The simplest way: fill a glass with ice, pour concentrate halfway, top with cold water. Done.
With milk: same thing but replace the water with whatever milk you like. Oat milk and cold brew is a genuinely good combination — the natural sweetness of oat milk complements the chocolate and caramel notes in cold brew without needing added sugar.
Vanilla cold brew: add half a teaspoon of vanilla extract to the full batch of concentrate before storing. Or make a quick vanilla simple syrup (equal parts sugar and water, heated until dissolved, plus a split vanilla bean or a tablespoon of extract). A tablespoon of that syrup in a glass of cold brew is better than any flavored coffee you will buy.
Sweet cream cold brew: whisk together 2 tablespoons heavy cream, 2 tablespoons milk, and 1 tablespoon vanilla syrup. Pour your cold brew over ice and float the sweet cream on top. Don't stir — let it cascade down as you drink.
Bean recommendations
Medium to dark roast works best for cold brew. Light roasts can taste thin and overly acidic without heat to develop their flavors. A medium roast from Central America or Brazil gives you chocolate and nutty notes. A darker roast leans into caramel and smoky flavors.
You do not need expensive single-origin beans for cold brew. The long steep time extracts flavor gently, so even a $12 bag of grocery store medium roast makes a solid batch. Save the fancy beans for pour-over where you can actually taste the subtlety.
Common mistakes
Grinding too fine. This is the number one mistake. If your cold brew tastes bitter or looks like mud, your grind is too fine. You want chunks, not powder.
Not straining twice. One pass through a mesh strainer leaves sediment that makes the brew taste chalky after a day in the fridge.
Steeping at room temperature. Some recipes say to leave it on the counter. It works, but fridge steeping gives a cleaner, less acidic result. Room temperature speeds up extraction, which also speeds up the extraction of bitter compounds you are trying to avoid.
Using old coffee. Cold brew is forgiving, but stale beans still taste stale. If your bag has been open for more than three weeks, the cold brew will taste flat. Buy fresh, grind right before steeping.
Why this beats the coffee shop version
Cost is the obvious one. A batch of cold brew concentrate costs about $3 in beans and makes roughly 8 servings. That is 37 cents a glass versus $5 to $6 at a coffee shop.
Freshness is the less obvious advantage. Coffee shops make cold brew in large batches and it sits in a keg or dispenser. By the time you buy it, it might be three or four days old. Yours is as fresh as you want it to be.
Control matters too. You pick the beans, the ratio, the steep time, and the additions. No mystery syrups, no guessing how much sugar went in, no hoping they used good beans today.