How to Make a Coffee Concentrate for the Week (the 30-Minute Sunday Prep)
If you drink coffee every morning and you're tired of measuring, grinding, and brewing each day, this post is for you. A weekly coffee concentrate lets you brew once on Sunday and have ready-to-dilute coffee for 5-7 days.
Our Latin American Blend is what we concentrate for the fridge — it stays balanced across hot, iced, and milk drinks all week.
The setup takes 30 minutes on Sunday morning. The daily routine takes 30 seconds.
What a coffee concentrate actually is
A coffee concentrate is coffee brewed at a higher strength than you would normally drink. The ratio is roughly 2 parts water to 1 part coffee by weight (instead of the standard 16:1 for brewed coffee).
You dilute the concentrate with water or milk before drinking. The dilution ratio depends on how strong you like your cup. A typical dilution is 1:1 concentrate-to-water for a regular-strength cup, or 1:1 concentrate-to-milk for a milkier drink.
The concentrate keeps in the fridge for 5-7 days. The brewing method is almost always cold brew — steeping coarse-ground coffee in cold or room-temperature water for 12-18 hours.
Why this works
Cold-brewed coffee has several properties that make it ideal for concentrate:
- Less bitter. Cold water extracts fewer bitter compounds than hot water. The concentrate is smooth and sweet even at high strength.
- Stable for a week. Cold-brewed coffee is less prone to oxidation than hot-brewed. Refrigerated, it stays fresh-tasting for 5-7 days.
- Higher concentration is forgiving. When you're brewing at standard strength (16:1), small errors in grind or steep time produce noticeable flavor shifts. At concentrate strength (2:1), the small errors are absorbed by the dilution.
The trade-off is brew time. Hot coffee takes 4 minutes. Cold brew takes 12-18 hours. You make up for it by brewing once and drinking all week.
The equipment
You need:
- A 1-quart or 2-quart container with a lid. Mason jar, large French press, or any food-safe plastic or glass container.
- Coarse-ground coffee. Grind at the coarsest setting your grinder has. The grind should look like coarse sea salt.
- A fine mesh strainer or cheesecloth. For filtering out the grounds after steeping.
- Filtered water. Not strictly required, but the cup is noticeably better with filtered water (see our brewing coffee with bottled water post for why).
If you have a French press, that's the easiest vessel — the mesh filter is built in.
If you don't have a French press, a mason jar + cheesecloth works fine.
The recipe (1-quart batch)
This makes about 32 oz of concentrate, which dilutes to 64 oz of ready-to-drink coffee (about 8 cups at 8 oz each).
- 250 g coffee, ground coarse
- 750 g filtered water (cold or room temperature)
- 1-quart container with lid
Process:
- Combine coffee and water in the container. Stir gently to make sure all grounds are wet.
- Cover and steep. Refrigerator: 12-16 hours. Counter: 14-18 hours (room temp slows the extraction slightly).
- Strain. If using a French press, press the plunger down slowly and decant. If using a mason jar, pour through a cheesecloth-lined mesh strainer into another container.
- Store in the fridge. The concentrate keeps for 5-7 days.
The total hands-on time is about 5 minutes. The passive time is the 12-16 hours of steeping.
How to dilute
The dilution ratio depends on what you're making.
For a regular hot cup: 1 part concentrate to 1 part hot water. Heat the water separately and pour over the concentrate (don't heat the concentrate directly — it scalds).
For iced coffee: 1 part concentrate to 1 part cold water, poured over ice. The ice will dilute further, so you can go slightly stronger if you want.
For a latte-style drink: 1 part concentrate to 1 part milk (any kind). Heat the milk if you want a hot latte.
For a cold brew style drink: 1 part concentrate to 1 part cold water + ice. Less milk, more water.
For a stronger morning cup: 2 parts concentrate to 1 part water. Stronger, more caffeine, more concentrated flavor.
For a weaker afternoon cup: 1 part concentrate to 2 parts water. Lighter, less caffeine, more like a tea-strength drink.
The dilution is forgiving. Start with 1:1 and adjust to taste.
What kind of coffee to use
You can use any coffee for concentrate. The cold-brew method is forgiving of origin and roast. But there are a few guidelines:
Single origin is fine. A washed Ethiopian concentrate makes a bright, fruit-forward cup. A Brazilian concentrate makes a chocolate-forward cup. The concentrate picks up the origin character, just muted compared to hot-brewed.
Medium roast is the most flexible. A medium roast concentrate works equally well with milk or water. A light roast concentrate can taste too bright when diluted with milk. A dark roast concentrate can taste too heavy when diluted with water.
Use coffee you'll actually drink. Don't use a fancy Geisha for concentrate. The Geisha's delicate flavors are muted in cold brew, and you're paying for flavors you won't taste. A good $18-22 single origin is the sweet spot.
If you want to try this with one of our coffees, the Colombia Antioquia washed is a great first batch — it makes a balanced concentrate that works for any dilution.
Variations
Hot brew concentrate (faster but less sweet): Use 1:2 coffee-to-water ratio with hot water. Steep for 4 hours at room temp. Strain and refrigerate. The cup is brighter and slightly more bitter than cold brew.
Double-strength for milk drinks: Use 1:1 coffee-to-water ratio. This makes a concentrate specifically designed for 1:1 dilution with milk. The result is a strong milk drink without the concentrate tasting weak.
Decaf concentrate: Same recipe with decaf beans. Good for an afternoon cup without the caffeine.
Tea concentrate: Same principle with tea leaves. 30 g tea to 500 g cold water. Steep 4-6 hours. Strain. Dilute 1:1 with cold water for iced tea. Our hibiscus iced tea cold-brew recipe is a similar approach.
Common mistakes
Grinding too fine. If your grounds are medium or fine, the concentrate will be cloudy and gritty. Coarse is essential.
Steeping too short. Under 12 hours, the extraction is incomplete and the concentrate tastes thin. Steep the full 12-16 hours.
Steeping too long. Over 24 hours, the extraction starts producing bitter compounds. The concentrate will taste harsh. Stick to the 12-18 hour window.
Skipping the filter. Unfiltered concentrate has sediment that sinks to the bottom. Strain through a fine mesh or cheesecloth.
Not diluting enough. Drinking concentrate straight is unpleasant — it's twice as strong as brewed coffee. Always dilute.
A Sunday prep routine
Here's what a 30-minute Sunday prep looks like:
- 0:00 — Measure 250 g coffee, grind coarse
- 0:05 — Combine with 750 g water in container, stir
- 0:07 — Cover, put in fridge
- 0:08 — Brew a regular pot of coffee for Sunday morning (or use yesterday's leftover)
- 0:30 — Done until Sunday evening
Sunday evening, before bed:
- 0:00 — Strain concentrate into clean container (2 minutes)
- 0:02 — Return to fridge
Total active time: 12 minutes over two sessions.
The honest summary
A weekly coffee concentrate is one of the cheapest time-savers in your morning routine. The setup is $0-25 (a French press if you don't have one). The coffee cost is the same as brewing daily. The time saved is 4-6 minutes per morning for 5-7 days.
If you drink coffee every day and you have a fridge and a French press, there's no reason not to do this. The concentrate keeps well, the dilution is forgiving, and the daily routine becomes "pour and dilute" instead of "grind and brew."
Brew slow on Sunday. Glug fast all week.
For more on cold-brewing in general, our how to make cold brew at home post is the longer version. Our cold brew concentrate vs ready-to-drink cold brew post compares this approach to store-bought concentrates. For the daily iced version, our how to brew iced coffee without diluting post covers hot-brew iced methods.