Cold brew coffee ratio calculator

The difference is whether you strain and drink, or strain and dilute. Ready-to-drink cold brew at 1:8 is brewed to final strength — pour it over ice, add milk if you want, and go. Concentrate at 1:5 is intentionally too strong to drink straight. You cut it 1:1 with water, milk, or ice, which brings it down to drinking strength while giving you control over each serving.

Concentrate makes more practical sense for most people. It takes up less fridge space (you're storing half the volume for the same number of servings), lasts longer undiluted, and lets each person in a household adjust their own strength. A 500ml batch of concentrate makes roughly 6-8 servings when diluted. A 500ml batch of ready-to-drink makes 2-3.

The flavor profiles differ slightly. Concentrate, when diluted, tends to taste a bit sharper and more defined than the same beans brewed directly at 1:8. This is because the higher coffee-to-water ratio in concentrate extracts proportionally more aromatic compounds, and dilution doesn't diminish them the way brewing at lower concentration does. The difference is subtle but noticeable if you compare them side by side.

Grind coarse. The same coarse grind you'd use for french press. Cold water extracts slowly, so a coarse grind prevents over-extraction during the long steep. Fine grinds produce bitter, muddy cold brew and are harder to filter cleanly. If you're buying pre-ground, look for "coarse" or "french press" grind — never espresso or drip.

Use cold or room-temperature filtered water. Don't use hot water to start — that changes the extraction chemistry and produces a different flavor profile (closer to Japanese iced coffee, which is a separate method). Filtered water makes a noticeable difference in cold brew because there's no heat to mask mineral or chlorine flavors. Tap water with strong chlorine taste produces cold brew that tastes flat and chemical.

Steep in the fridge, not the counter. Refrigerator temperature (35-40°F) produces a cleaner, brighter cold brew. Room temperature speeds extraction but tends to produce a heavier, muddier cup. Fridge steeping also eliminates any food safety concerns during the long brew window.

Strain twice. First through a fine mesh strainer to catch the grounds, then through a paper filter or cheesecloth to remove fines. Single-straining with mesh alone leaves microscopic particles that make the cold brew look cloudy and taste gritty. The second paper filtration produces the crystal-clear, smooth result you'd get from a coffee shop. A Chemex filter works perfectly for this second pass.

Cold brew and iced coffee are different methods producing different drinks. Cold brew steeps grounds in cold water for 12+ hours. Iced coffee brews hot (drip, pour over, espresso) and chills over ice. The extraction chemistry is fundamentally different because temperature determines which compounds dissolve.

Cold brew is smooth, sweet, and low-acid because cold water doesn't efficiently extract the bright acids present in hot coffee. Iced coffee retains the acidity and complexity of hot brewing but served cold — it tastes like chilled regular coffee, with more brightness and more bite. Neither is better; they're different drinks for different preferences.

If you like bright, fruity coffees with acidity, iced pour over or Japanese iced method is usually more interesting. If you want smooth, sweet, and easy-drinking with minimal acid, cold brew is the move. Cold brew also handles dark roasts particularly well — the low-acid extraction tames bitterness that hot brewing amplifies.