Cold Brew Calculator

Cold brew coffee is built from a coffee-to-water ratio, and the water volume and yield estimates for a batch follow directly from the coffee amount and the chosen brew style. Concentrate uses a 1:5 coffee-to-water ratio and produces a strong base meant to be diluted before drinking. Ready to Drink uses a 1:8 ratio and produces coffee at drinking strength without further dilution. A custom ratio can also be set for any style in between.

Coffee amount can be entered in grams, ounces, or tablespoons; one tablespoon of ground coffee is treated as approximately 5.3 grams for conversion. Water and output volumes can be displayed in milliliters, fluid ounces, or cups. Steep time, chosen from 12, 16, 18, or 24 hours, affects the result directly: longer steep times generally produce a stronger, smoother extraction with lower acidity. Number of servings and serving size together set how many drinks a batch yields, since the diluted yield is divided by the serving size.

Settings holds the dilution ratio for concentrate batches, entered as two numbers separated by a colon, such as 1:1 for equal parts concentrate and water or 1:2 for one part concentrate to two parts water, along with a grind coarseness recommendation and a step-by-step formula display. Because concentrate is meant to be cut with water or milk after steeping and ready-to-drink is not, the same coffee weight produces a very different final serving strength depending on which style is chosen, independent of the steep time used.

100 grams of coffee at the 1:5 concentrate ratio needs 100 x 5 = 500 milliliters of water to steep. The same 100 grams at the 1:8 ready-to-drink ratio instead needs 100 x 8 = 800 milliliters, since that style skips the later dilution step entirely.

Cold brew coffee requires precise ratios to balance flavor extraction and strength. The scenarios below show how ratio and dilution adjustments serve different brewing goals.

• Home Batch Brewing: A weekly batch of cold brew concentrate scales from the total coffee weight on hand, with the Concentrate style and servings set to match weekly consumption. The diluted yield shows exactly how many cups a single refrigerated batch will produce.
• Cafe Menu Development: Standardizing cold brew recipes across multiple baristas means fixing a coffee weight, ratio, and dilution factor and recording the exact water volume and concentrate yield, keeping flavor and strength consistent from batch to batch.
• Travel and Camping: Cold brew with limited measuring tools works from cups or tablespoons instead of a scale; entering the available coffee supply confirms the needed water volume fits the brewing container before leaving home.
• Flavor Experimentation: Comparing extraction profiles across 1:5, 1:8, and custom ratios while holding coffee weight constant shows how water volume changes affect steep concentration and final diluted strength.
• Dietary Tracking: The exact volume of concentrate and diluted coffee per serving, paired with nutritional data from a given coffee brand, supports calorie and caffeine logging.
• Event and Party Planning: A cold brew recipe scaled for a large gathering, from a high serving count and target serving size, shows the total coffee and water needed to produce enough diluted cold brew for all guests without over-brewing or running short.
• Equipment Sizing: Checking a candidate brewing vessel's capacity against the water volume output, plus coffee, confirms it holds enough for the desired batch size before purchasing or committing to a recipe scale.