Food & Cooking

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Cold Brew Ratio Calculator.

Calculate cold-brew coffee dose from water mass and an explicit ratio.

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Set your values

Results update as you type.

Coffee mass: 125 g

Coffee mass

125.0000g
Total brew mass: 1,125 g

Total brew mass

1,125.0000g

Results update automatically as you type.

Use Cases

Batch Brewing for a Crowd

When making a large batch of cold brew for a party or weekly supply, quickly determine how much coffee you need for a specific amount of water.

Example: For 1000 g of water at a 10:1 ratio, you need 100 g of coffee.

Experimenting with Strength

Use the calculator to adjust your coffee dose when trying different ratios to find your preferred strength without wasting ingredients.

Example: Compare 8:1 vs. 12:1 for the same 500 g water to see the dose difference.

Frequently Asked Questions

How do I use the Cold Brew Ratio Calculator?
Enter the mass of water you plan to use in grams, and set your desired water-to-coffee ratio (e.g., 8:1 for a stronger brew, 12:1 for a milder one). The calculator will instantly show the required coffee dose in grams.
What is a good water-to-coffee ratio for cold brew?
Common ratios range from 8:1 to 12:1. A lower ratio (like 8:1) yields a stronger, more concentrated brew, while a higher ratio (like 12:1) produces a milder, ready-to-drink cold brew. Adjust to your taste.
Does the calculator account for coffee absorption or yield?
No, it calculates the coffee dose based solely on the water mass and the ratio you input. It does not account for water absorbed by the grounds or the final yield, which may vary with grind size and brewing time.

Tips & Common Mistakes

Tips

  • Use a kitchen scale for accurate water mass and coffee dose; volume measurements can be inconsistent.
  • For a balanced cold brew, start with a 10:1 ratio and adjust based on your taste preference.
  • Remember that the ratio is water-to-coffee, so a higher number means more water relative to coffee, resulting in a weaker brew.
  • Grind size affects extraction, but the calculator only determines the dose; adjust grind and steeping time separately.

Common Mistakes to Avoid

  • Confusing the ratio direction: a 10:1 ratio means 10 parts water to 1 part coffee, not the other way around.
  • Using volume (cups) instead of mass (grams) for water, which can lead to inaccurate doses due to density variations.
  • Forgetting that the calculator gives the coffee dose for the given water mass; if you change the water amount, you must recalculate.

Last updated: August 13, 2026