Cold Brew Ratio Calculator
Calculate cold brew coffee grounds, water, concentrate yield, dilution, final drink volume, and servings.
Build a repeatable cold brew recipe
A cold brew ratio compares coffee grounds to brew water by weight. A 1:5 ratio means 1 gram of coffee for every 5 grams of water, often used for concentrate. A ready-to-drink cold brew usually uses more water, such as 1:10 to 1:14.
Use the calculator to find water from coffee, coffee from water, a full recipe from target servings, or the final drink amount after diluting concentrate with water, milk, or ice.
Treat the output as a starting recipe. Grind size, steep time, filtration, roast level, water quality, and dilution all change the final flavor.
Recommended brew water
Coffee --, water --, ratio --
Coffee dose
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Brew water
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Concentrate yield
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Final drink yield
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Batch size table
Scale the same cold brew ratio for common serving counts.
| Batch | Coffee | Brew water | Concentrate | Final drink |
|---|---|---|---|---|
| Run the calculator to see batch sizes. | ||||
Taste note: If cold brew tastes thin, use a stronger ratio or less dilution. If it tastes harsh, try a coarser grind, shorter steep time, or more dilution after filtering.
How to use the cold brew ratio calculator
- Choose a mode: Start with coffee amount, water amount, target servings, or concentrate dilution.
- Pick a cold brew style: Choose ready-to-drink, light concentrate, standard concentrate, strong concentrate, or a custom ratio.
- Set dilution: Use no dilution for ready-to-drink cold brew, or 1:1 and 1:2 options for concentrate.
- Enter the known value: Add coffee, brew water, servings, serving size, or concentrate amount.
- Check yield: The calculator estimates concentrate yield after grounds absorb water, then calculates the final drink volume after dilution.
Cold brew ratio formulas
Cold brew ratios are usually written as coffee to water by weight. Calculate a cold brew ratio by using 1 gram of coffee with 4 to 8 grams of water. A standard cold brew concentrate uses a 1:4 ratio. Ready-to-drink cold brew usually uses a 1:8 ratio. For example, use 100 grams of coffee with 400 to 800 grams of water.
Brew water = coffee × ratio denominator
Coffee = brew water ÷ ratio denominator
Concentrate yield = brew water − (coffee × absorption)
Final drink = concentrate yield × (1 + dilution liquid)
Example: 100 g of coffee at 1:4 needs 400 ml of water for a standard concentrate. If the grounds retain about 230 ml of water, the filtered concentrate yield is about 170 ml. Diluted 1:1, that becomes about 340 ml of final cold brew drink.
Further reading: A Scientific Reports study on cold brew coffee examines how time, roasting temperature, and grind size affect caffeine and chlorogenic acid concentrations.
Cold brew ratio guide
The best ratio depends on whether you want ready-to-drink cold brew or a concentrate that will be diluted later. Start with the table below, then adjust based on flavor, strength, steep time, and how much ice or milk you add.
| Cold brew style | Starting ratio | Common range | Dilution after brewing | Best for |
|---|---|---|---|---|
| Ready-to-drink cold brew | 1:8 | 1:8 to 1:12 | Little or none | Simple iced coffee served straight from the fridge |
| Light concentrate | 1:6 | 1:5 to 1:7 | Often 1:0.5 or 1:1 | Cold brew with moderate strength and easy dilution |
| Standard concentrate | 1:4 | 1:4 to 1:5 | Often 1:1 or 1:2 | Batch prep, milk drinks, iced coffee, and flexible serving sizes |
| Strong concentrate | 1:3 | 1:3 to 1:4 | Usually 1:1 to 1:3 | Small fridge storage, strong milk drinks, or heavy ice dilution |
Interesting Fact
Cold brew has moved from a niche coffee shop drink to a mainstream coffee choice. According to the National Coffee Association’s Fall 2024 National Coffee Data Trends analysis, 21% of Americans drank cold brew in the past week, up by more than 30% since January 2024. That growth helps explain why cold brew recipes now need more precision around ratio, concentrate strength, dilution, and final yield. Source: National Coffee Association.
Cold brew concentrate dilution guide
Cold brew concentrate is designed to be diluted after filtering. The same concentrate can taste very different depending on whether you add water, milk, ice, or a combination of all three.
Light iced coffee
Use 1 part concentrate with 2 parts water or milk. This works well when serving over plenty of ice.
Balanced cold brew
Use 1 part concentrate with 1 part water or milk. This is a practical starting point for a standard 1:5 concentrate.
Strong cold brew
Use 2 parts concentrate with 1 part water or milk. This keeps more body and coffee flavor in larger mugs or milk-based drinks.
Further reading: Harvard T.H. Chan School of Public Health notes that cold brew’s lower acidity may make it easier for some people to drink without adding as much cream, milk, or sugar: Cold brew coffee as healthy as the hot kind.
Grind size and steep time guide
Cold brew extracts slowly because it uses cool or room-temperature water. Ratio sets the strength, while grind size and steep time shape extraction and flavor.
For ready-to-drink cold brew
Use a coarse grind and steep for about 12 to 16 hours. If the drink tastes weak, try a stronger ratio before extending steep time too much.
For concentrate
Use a coarse to extra-coarse grind and steep for about 16 to 24 hours. Concentrate needs enough extraction to remain flavorful after dilution.
If it tastes harsh
Use a coarser grind, shorten steep time, filter more carefully, or dilute more after brewing.
If it tastes flat
Use a stronger ratio, steep a little longer, grind slightly finer, or reduce dilution after filtering.
How to fix cold brew by taste
If the recipe math is correct but the drink still tastes wrong, use this troubleshooting table before changing everything at once.
| Problem | Likely cause | Best first fix | Second fix |
|---|---|---|---|
| Too weak or watery | Too much water or too much dilution | Use a stronger brew ratio or less dilution | Steep longer or grind slightly finer |
| Too strong or heavy | Concentrate is too intense for the serving size | Add more water, milk, or ice | Use a lighter ratio next batch |
| Bitter or harsh | Too fine, too long, or too much sediment | Use a coarser grind or shorter steep | Filter through paper after initial straining |
| Flat or dull | Under-extracted or over-diluted | Reduce dilution or use more concentrate | Steep longer or try fresher coffee |
Frequently Asked Questions
What is the best cold brew coffee ratio?
The best cold brew coffee ratio depends on whether you want concentrate or a ready-to-drink serving. A standard concentrate often starts at 1:4, while a lighter ready-to-drink cold brew often starts around 1:8. Use the calculator to adjust water, coffee grounds, dilution, and final yield based on the strength and flavor you prefer.
How much coffee do I need for one batch of cold brew?
For a 1:4 cold brew concentrate, use 250 grams of coffee with 1 liter of water. For a 1:8 ready-to-drink batch, use about 125 grams of coffee with 1 liter of water. If you brew in a large pitcher or jar, remember that the final yield will be lower because the grounds absorb some liquid during steeping.
Can I measure cold brew in grams, ounces, cups, or milliliters?
Yes, but grams and milliliters are the most repeatable for cold brew. Ounces also work well if you prefer imperial units. Cups are convenient for quick home brewing, but they are less precise because different beans, roast levels, and grind sizes can change how much coffee fits into the same cup.
How should I dilute cold brew concentrate?
Start with 1 part concentrate and 1 part water or milk. For a lighter iced serving, use more dilution or add plenty of ice. For a stronger drink, use less water, less milk, or a larger concentrate dose. The right dilution depends on the batch strength and the size of the glass or mug.
What grind size works best for cold brew?
A coarse grind size is usually best because it is easier to filter and gives a cleaner flavor. Fine grounds can extract faster, but they often leave sediment in the jar or pitcher and may make the drink taste muddy or harsh. If your cold brew tastes weak, adjust the ratio or brew time before switching to a very fine grind.
What is the ideal cold brew steep time or brew time?
Most cold brew recipes use a steep time of about 12 to 18 hours. A lighter ready-to-drink batch may be ready closer to 12 hours, while concentrate can benefit from a longer brew time of 16 to 24 hours. If the flavor becomes bitter or heavy, shorten the steep or use a coarser grind next time.
Why is my cold brew yield lower than the water I added?
The yield is lower because coffee grounds hold onto water after brewing. This loss is especially noticeable in a strong concentrate because the recipe uses more coffee. A paper filter, metal filter, or cloth filter can also affect how much liquid drains from the grounds before the cold brew is stored or served.
How many servings does a pitcher of cold brew make?
The number of servings depends on the batch size, concentrate yield, dilution ratio, and serving size. A small 180 ml glass gives more servings, while a large iced drink with milk and ice uses more concentrate. Use the calculator’s serving mode when you want to plan a full pitcher or jar for several people.
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Disclaimer: This cold brew ratio calculator is for general brewing, recipe scaling, and educational use only. Cold brew flavor depends on beans, roast level, grind size, steep time, water quality, filtration, storage, dilution, ice, milk, and personal preference. The ratios and yield estimates are starting points, not fixed rules. For food service, commercial brewing, or specialty coffee training, verify recipes with your equipment, workflow, storage practices, and sensory standards.
Further reading: For general refrigerated food and beverage storage safety, see the FoodSafety.gov cold food storage chart.
Last updated: May 30, 2026