How much coffee do I use in the Mason Jar (Quart/32oz)?

For an everyday strength, 75 g of coffee to 710 mL of water, a 1:9.5 ratio. For a concentrate, 94 g to 423 mL.

How long do I steep cold brew in the Mason Jar (Quart/32oz)?

18–22 hours in the fridge for a light roast, 14–18 for medium and 10–14 for dark. On the counter, 12–14, 9–12 and 7–9 hours.

Jar

Mason Jar (Quart/32oz): cold brew ratio and recipe

75g coffee710mL water

That is an everyday batch at 1:9.5, steeped 18–22 hours in the fridge and poured straight over ice. Holds 710 mL of water and takes up to 94 g of coffee.

Open this in Cold Brew Studio Get the iPhone app

Mason Jar (Quart/32oz), full of cold brew

The recipe, by strength

Each one fills this brewer as far as it honestly goes. Numbers are for a light roast steeping in the fridge.

Strength	Ratio	Coffee	Water	Steep	Makes	Drink it
Everyday	1:9.5	75 g	710 mL	18–22 h	about 2¼ cups	straight over ice
Strong	1:7.5	94 g	705 mL	18–22 h	about 2¼ cups	with a splash of milk
Jet fuel	1:5.3	94 g	498 mL	18–22 h	about 2 cups	cut with a little water or milk
Concentrate	1:4.5	94 g	423 mL	18–22 h	about 2 cups	mixed 1:1 with water or milk

If your beans are darker

Darker roasts give up their flavor faster, so they brew at a slightly wider ratio and steep for less time.

Roast	Ratio	Coffee	Water	Steep in the fridge
Light	1:9.5	75 g	710 mL	18–22 h
Medium	1:10	71 g	710 mL	14–18 h
Dark	1:10.5	68 g	710 mL	10–14 h

Everyday strength shown.

How it goes

Grounds in.
Water over.
Stir once.
Lid on, into the fridge.

Grind coarse, about the size of coarse sea salt. Find the number for your grinder.

Good to know

This brewer takes about 94 g of coffee at most. Stronger recipes can’t add more grounds, so they use less water instead. That is why Strong, Jet fuel and Concentrate come in under the full 710 mL.

Let the app keep track.

Cold Brew Studio sizes every batch to your Mason Jar, tells you when it is ready, and adjusts the recipe when you rate how it tasted.

Open this in Cold Brew Studio Get the iPhone app

Free on iPhone and the web. No account needed.

Quick answers

How much coffee do I use in the Mason Jar (Quart/32oz)?: For an everyday strength, 75 g of coffee to 710 mL of water, a 1:9.5 ratio. For a concentrate, 94 g to 423 mL.
How long do I steep cold brew in the Mason Jar (Quart/32oz)?: 18–22 hours in the fridge for a light roast, 14–18 for medium and 10–14 for dark. On the counter, 12–14, 9–12 and 7–9 hours.