A tool designed to assist in determining the correct ratio of coffee grounds to water when preparing a specific type of chilled coffee beverage. It typically considers factors such as desired final volume, coffee strength, and brewing time to suggest appropriate ingredient quantities. For example, an individual aiming to produce one liter of strong concentrate might input those parameters and receive recommendations on the grams of coarsely ground coffee and milliliters of water required.
This type of instrument provides several advantages, including consistency in results, reduction of waste by preventing over- or under-extraction, and simplified recipe scaling for both individual servings and larger batches. Historically, brewers relied on experience and experimentation to dial in their recipes, leading to variability. The advent of such tools offers a more precise and repeatable approach, allowing users to achieve preferred flavor profiles with greater efficiency. The utility of such a method has grown as the consumption of this beverage has increased.