What does this tool do?
Cold brew is made with cold water and a long steep, so the ratio determines whether you get a concentrate to dilute or a ready-to-drink batch. A 1:5 to 1:8 ratio makes a concentrate; 1:12 to 1:15 is closer to a finished drink.
The Formula
Water (ml) = coffee (g) × ratio; brewed yield ≈ water − (coffee × 2)Frequently Asked Questions
Should I use a concentrate or ready-to-drink ratio?
Use 1:5 to 1:8 if you plan to dilute with water or milk and want to store a small volume. Use 1:12 to 1:15 if you want to pour it straight over ice.
How long should cold brew steep?
Twelve to eighteen hours in the refrigerator is typical. Longer steeping extracts more, but it can also bring out bitterness and woody notes, especially with dark roasts.