What coffee-to-water ratio should I use for cold brew?

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What coffee-to-water ratio should I use for cold brew? I’m looking to make a batch at home in a large container (like a mason jar or cold brew pitcher) and will be steeping it for 18-24 hours at room temperature. I prefer a smooth, strong concentrate that I can later dilute with water or milk, but I’m open to recommendations for different strengths—whether it should be more concentrated for adding over ice or a balanced one for drinking straight. Also, should the ratio change if I use coarser grounds (specifically a medium-coarse grind for cold brew) versus something finer? And does the type of coffee (e.g., dark roast vs. light roast) affect the ideal ratio?

The recommended coffee-to-water ratio for cold brew typically ranges from 1:4 to 1:8 by weight (coffee:water), with 1:6 as a widely used starting point for balanced flavor. Here’s a detailed breakdown:

Standard Ratios & Measurements

  • By Weight (Grams):
    • Strong Concentrate: 1:4 (e.g., 150g coffee : 600g water).
    • Balanced Concentrate: 1:5 (e.g., 150g coffee : 750g water).
    • Milder Concentrate: 1:6 to 1:8 (e.g., 150g coffee : 900–1200g water).
  • By Volume (Cups/Fluid Ounces):
    Use approximately 1 cup (8oz/240ml) coarse-ground coffee per 4–6 cups (32–48oz/950–1135ml) of water for a 1:5–1:6 ratio.

Key Variables to Adjust

  1. Grind Size:
    Use cose grind (similar to sea salt). Fine grinds over-extract and create bitterness.
  2. Steeping Time:
    • 12–16 hours: Standard for most recipes; produces a smooth, balanced concentrate.
    • Up to 24 hours: Yields a stronger, more robust flavor but may increase astringency if overdone.
  3. Water Temperature:
    Use cold or room-temperature water only (never hot). Room temperature (~70°F/21°C) steeps slightly faster.
  4. Coffee Quality:
    Fresh, high-quality beans (e.g., medium-to-dark roasts) enhance flavor complexity.
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Step-by-Step Brewing Ratios

  1. 1:5 Ratio (Balanced):
    • Coffee: 150g (3 standard scoops).
    • Water: 750ml (3 cups).
    • Steep: 14–16 hours.
  2. 1:6 Ratio (Milder):
    • Coffee: 150g.
    • Water: 900ml.
    • Steep: 16–20 hours.

Customization Tips

  • For a Cold Brew Latte: Use a 1:4 ratio to create a stronger concentrate that cuts through milk.
  • Dilution: Most concentrates are diluted 1:1 with water, milk, or ice before serving. Adjust to taste.
  • Yield: A 1:5 ratio yields ~750ml of concentrate, making ~1.5 liters of ready-to-drink coffee after dilution.

Why This Ratio Works

Cold brew’s long immersion time requires less coffee than espresso to avoid overextraction. A 1:5–1:6 ratio ensures smooth, low-acidity coffee without bitterness. Experiment within the 1:4–1:8 range to suit your preference for strength.

Published: October 11, 2025