Guide

Cold Brew Ratio Guide

Choose the best cold brew coffee ratio for concentrate, ready-to-drink cold brew, iced milk drinks and smoother flavor.

By Online Coffee Guide Editorial TeamPublished Updated 3 min read
Cold brew concentrate and ready-to-drink cold brew served over ice beside a bottle and coarse coffee grounds.
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Quick Answer

Use a 1:4 ratio for cold brew concentrate and a 1:8 to 1:10 ratio for ready-to-drink cold brew. For example, 100g coffee with 400g water makes concentrate, while 100g coffee with 800-1,000g water makes a finished drink. Dilute concentrate with water, milk or ice before serving.

Key Takeaways

  • 11:4 is best for concentrate.
  • 21:8-1:10 is better for ready-to-drink cold brew.
  • 3Steep time, grind size and filtration matter as much as ratio.
Cold brew coffee poured over ice with milk and water nearby for diluting concentrate.
Cold brew ratio depends on whether you want a concentrate or a ready-to-drink glass.

Cold brew ratios can be confusing because people use "cold brew" to mean both concentrate and finished coffee. A concentrate is intentionally strong and needs dilution. Ready-to-drink cold brew should taste balanced straight from the fridge.

Ratio Table

Reader GuideCoffee Reference Table
StyleRatioExampleBest For
Concentrate1:4100g coffee / 400g waterDilution, milk drinks, batching
Medium concentrate1:6100g coffee / 600g waterLess dilution, stronger serving
Ready-to-drink1:8100g coffee / 800g waterStrong black cold brew
Lighter ready-to-drink1:10100g coffee / 1,000g waterEasy-drinking cold brew

Dilution Guide

Reader GuideCoffee Reference Table
ConcentrateAddResult
1 part concentrate1 part waterBalanced black cold brew
1 part concentrate1 part milkRich milk drink
1 part concentrateIce onlyStronger, heavier cup
1 part concentrate2 parts waterLighter iced coffee style

Taste after dilution. Judging concentrate without dilution usually makes it seem harsh.

How To Fix The Ratio

Reader GuideCoffee Reference Table
ProblemAdjustment
Too strongDilute more or brew at 1:6 instead of 1:4
Too weakUse 1:8 or reduce dilution
BitterGrind coarser or steep less
SludgyFilter better or grind coarser
FlatUse fresher coffee or slightly stronger ratio

Use this with How to Make Cold Brew Coffee, Coffee to Water Ratio Guide, Iced Coffee Guide, and Coffee Storage Guide. For method details, continue with Cold Brew.

Sources And Further Reading