How to Make Cold Brew at Home: Ratio, Steep Time, and Recipe

The fix: Use a 1:8 ratio (80g coffee to 640g water), extra-coarse grind, 16–18 hours in the fridge, then dilute the concentrate 1:1 to taste.

Cold brew swaps heat for time: instead of extracting with hot water in minutes, you steep coarse grounds in cold water overnight. The result is smooth, sweet, and low in acidity — and it's the most forgiving brew method there is. You need a jar, a sieve, and patience.

#The recipe (start here)

1. Put the grounds in the jar and pour in all the water.
2. Stir well — every ground should be wet, with no dry clumps floating on top.
3. Lid on, into the fridge, walk away.
4. After 16–18 hours, strain. A sieve lined with a paper filter or cheesecloth works; pouring through a standard pour-over dripper is even cleaner. Expect straining to take a few minutes — don't press or squeeze the grounds, which pushes bitter sediment through.
5. Store the strained concentrate in the fridge for up to a week. Dilute per glass, not per batch — concentrate keeps better.

#Concentrate vs. ready-to-drink

Concentrate is the better default: it takes less fridge space, lasts longer, and lets each person dilute to taste — including with hot water for a quick "cold-brew americano."

#The variables that actually matter

• Grind: extra coarse, always. Fine grounds over-extract during the long steep (harsh, muddy) and clog your strainer into a 30-minute chore. If your cold brew is bitter or silty, the grind is too fine.
• Time: 12–24 hours, sweet spot 16–18. Under 12 hours tastes weak and watery; past 24 the cup turns woody and flat. Longer is not stronger in any pleasant way.
• Temperature: fridge vs. counter. Both work. Room temperature extracts faster (12–14 hours instead of 16–18) but is less forgiving and slightly more acidic; the fridge is slower and safer. Pick one and keep it consistent so your timing means something.
• Water quality. With a 16-hour steep and no heat, chlorine and off-flavors in tap water are more noticeable than in hot brewing. Filtered water makes a clearly better batch.
• Beans. Medium and medium-dark roasts shine in cold brew — chocolate, caramel, and nutty notes survive the cold steep better than delicate florals. This is also a great use for beans slightly past their peak freshness, since the long steep doesn't depend on the CO2 that fresh hot brewing does.

#Troubleshooting

#Cold brew is not iced coffee

Iced coffee is hot-brewed coffee cooled down — it keeps the acidity and aromatics of hot brewing. Cold brew never touches heat, so fewer acids and bitter compounds extract: that's where the smooth, chocolatey character comes from, and why people who find regular coffee harsh often love it. (Caffeine-wise, undiluted concentrate is stronger than regular coffee — dilute before judging your dose.)

Once you've made two or three batches, you'll stop measuring — but log your first few: ratio, grind setting, hours, and how it tasted. Cold brew has so few variables that two logged batches are enough to nail your house recipe permanently.