How long does homemade cold brew last in the fridge?

Undiluted concentrate stays fresh for 10–14 days in an airtight glass container in the fridge. Once diluted with water or milk, drink it within 2–3 days for the best flavor, since dilution and added dairy speed up degradation.

Can I use regular pre-ground coffee for cold brew?

You can, but standard pre-ground coffee is ground for drip machines — too fine for cold brew. It causes over-extraction, sludge, and clogged filters. Ask your roaster for a coarse grind, or buy whole beans and grind them coarse yourself for a much cleaner result.

Is cold brew stronger than regular coffee?

Concentrate is far stronger before dilution, but a typical served cup lands close to regular coffee. Because you brew at a 1:5 ratio and dilute 1:1, the final caffeine content is comparable to drip coffee — though undiluted concentrate can be nearly double the caffeine of a standard cup.

By the Cold Brew Coffee Gear Guide Editorial Team · 4 min read

Home cold brew coffee equipment: the complete beginner's guide

Cold brew isn't just iced coffee that got cold. It's a fundamentally different extraction method that trades heat for time, producing a smoother, lower-acid concentrate you can dilute for days. The good news: getting started at home costs less than a month of café runs. The trick is buying the right gear and dialing in a repeatable process. Here's exactly what you need and how to use it.

Cold brew vs iced coffee: know what you're making

These get confused constantly, but they're different drinks. Iced coffee is brewed hot (drip or espresso) and poured over ice. It's fast but keeps most of the acidity and bitterness of hot extraction. Cold brew steeps coarse grounds in cold or room-temperature water for 12–24 hours, extracting fewer bitter compounds and about 65–70% less perceived acidity.

Practically, cold brew produces a concentrate you store in the fridge and dilute to taste, while iced coffee is drunk at full strength immediately. If you want batch convenience and a mellow cup, cold brew wins. If you want a cup in five minutes, iced coffee is your move.

Best cold brew coffee maker for home: picking your gear

You don't need anything expensive, but the right vessel makes cleanup painless and results consistent.

Immersion brewers (best for beginners)

A jar-style immersion brewer with a fine-mesh filter basket is the easiest entry point. Options like the Toddy Cold Brew System (makes ~7 cups of concentrate) or the OXO Compact Cold Brew Maker handle the steep and filter in one unit. Expect to spend $25–$50.

French press (already in your cupboard)

A 32oz French press works fine for cold brew if you own one. Add coarse grounds and water, steep, then press slowly. The downside: the metal filter lets through more sediment than a dedicated cloth or paper filter.

Mason jar + nut milk bag (cheapest)

A quart mason jar and a reusable nut milk bag will get you brewing for under $10. Steep, then strain through the bag. Zero specialized equipment required.

Starter checklist

Brewing vessel — dedicated maker, French press, or a 1-quart mason jar
A scale — a $12 kitchen scale beats guessing with scoops
Burr grinder (or buy pre-ground coarse) — coarse, even grind is non-negotiable
Fine filter — cloth, paper, or nut milk bag for a clean pour
Airtight storage bottle — glass swing-top keeps concentrate fresh

Cold brew coffee ratio calculator: getting strength right

Ratio is where most beginners go wrong. Because cold brew is usually a concentrate, you brew strong and dilute later.

The standard starting points

Concentrate: 1:5 by weight (200g coffee to 1000g/1L water). Dilute 1:1 with water or milk before drinking.
Ready-to-drink: 1:8 (125g coffee to 1000g water). Drink as-is over ice.

To scale, pick your water amount and divide by your ratio number. Want 1L of concentrate at 1:5? Use 200g of coffee. Want 500ml ready-to-drink at 1:8? Use roughly 62g. Weigh everything — volume scoops vary wildly with grind size.

Adjust from there: if your brew tastes weak and watery, tighten toward 1:4. If it's harsh, loosen toward 1:6 or shorten your steep time.

Best beans for cold brew: what to buy

Cold brew is forgiving, but bean choice shapes the flavor more than you'd expect.

Roast level

Medium to medium-dark roasts are the sweet spot. They deliver chocolate, nut, and caramel notes that cold water pulls out cleanly. Very light roasts can taste sour and underwhelming cold; very dark roasts can turn ashy.

Origin

Brazilian and Colombian beans are reliable crowd-pleasers with low acidity and heavy body. Sumatran beans add earthy, full-bodied depth. Save your delicate, floral Ethiopian single-origins for hot pour-over where their nuance shines.

Grind and freshness

Use a coarse grind — think raw sugar or coarse sea salt. Too fine and you'll get sludge, over-extraction, and a clogged filter. Beans within 2–4 weeks of roast are ideal, but cold brew tolerates slightly older beans better than espresso does.

Cold brew filter replacement and maintenance

Filters are the part people neglect, and it shows up as gritty, off-tasting brew.

Cloth/felt filters (Toddy-style): rinse thoroughly after each use and store wet in the fridge in a sealed bag. Replace every 3–6 months, or sooner if you notice sour smells or slow draining. Never use soap — it soaks into the fabric.
Stainless mesh filters (OXO, French press): brush clean and dry fully. They last years but let more fines through; line with a paper filter for a clearer cup.
Paper filters: single-use, cheapest per-swap, produce the cleanest brew with the least sediment.

A clogging or slow-draining filter is the number-one sign it's time to replace. Keep a spare on hand so a worn filter never interrupts your routine.

Takeaway

Start simple: a mason jar or a $30 immersion maker, a scale, and coarse-ground medium-roast Brazilian or Colombian beans at a 1:5 ratio. Steep 16–18 hours, strain, dilute 1:1, and adjust from there. Keep your filters clean and replace them on schedule. Within a couple of batches you'll have a repeatable recipe that costs pennies per cup and beats most café cold brew.