Cold Brew Ratio Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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The Cold Brew Ratio Calculator is useful when a kitchen estimate needs more structure than a quick guess. It is designed to estimate coffee grounds, water, grounds volume, and caffeine for a target cold-brew concentrate and strength. Because the page keeps the relationship visible, you can change one ingredient, serving, time, or batch assumption and see exactly how the result moves.

What this calculator does

The Cold Brew Ratio Calculator uses the fields on this page to estimate coffee grounds, water, grounds volume, and caffeine for a target cold-brew concentrate and strength. Its primary output is labeled “Cold-brew recipe” and is displayed in g coffee grounds. Supporting readouts include Water, Grounds volume, Concentrate target.

How to use it

Enter or select Volume of coffee concentrate, Strength, Caffeine content, Water at room temperature; the page may also use Coffee grounds (by mass), Coffee grounds (by volume). Use the units displayed beside each quantity and change only the assumptions that describe your real recipe or event. The Cold Brew Ratio Calculator then recalculates the primary result and its supporting values from those visible inputs.

How the calculation works

The strength preset selects a water-to-grounds ratio from 10:1 down to 4:1. If water is blank, the model uses 1.25 × target concentrate volume; grounds = water ÷ ratio, with an approximate grounds-volume and caffeine estimate added.

Example

With Volume of coffee concentrate = 500 mL, Strength = Regular, the calculator returns 78.1 g coffee grounds for “Cold-brew recipe.” The same run also shows Water = 625 mL; Grounds volume = 230 mL; Concentrate target = 500 mL; Estimated caffeine = 781 mg. Changing one input at a time makes it easy to see which assumption is driving the result.

How to interpret the result

For the Cold Brew Ratio Calculator, the main output is expressed as g coffee grounds. Read it together with the supporting values and the exact inputs you used; a larger or smaller answer only has meaning within this calculator’s specific recipe, serving, or process model.

Limitations and notes

Coffee absorption, grind size, steep time, filtration losses, roast, and concentrate definition vary by recipe. The caffeine line is especially approximate unless you replace it with a measured or product-specific value.