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Cold Brew Concentrate Dilution Calculator

Get the perfect cold brew every time. Enter your concentrate amount and desired ratio to find the exact water, final volume, and servings.

1 Your Brew Parameters

1 :

2 Your Cold Brew Recipe

1 : 3

Concentrate to water ratio

Concentrate

—

Water

—

Final Volume

—

Concentrate %

—

Servings

—

Per Serving

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Enter your values above and press Calculate to see your custom dilution recipe.

How to Dilute Cold Brew Concentrate (The Right Way)

Cold brew concentrate is exactly what it sounds like: a strong, concentrated coffee extract made by steeping coarse coffee grounds in cold water for 12–24 hours. Because it's brewed at a much higher coffee-to-water ratio than ready-to-drink cold brew, you need to dilute it before serving.

The question is: how much water should you add? That's exactly what this calculator answers. But first, let's understand the numbers.

What Does 1:1 or 1:2 Dilution Mean?

A dilution ratio of 1:3 means one part concentrate to three parts water. So if you have 100 ml of concentrate, you add 300 ml of water for a total of 400 ml of cold brew.

Water = Concentrate × Water Ratio
Final Volume = Concentrate + Water

That's the core math. Our calculator handles the rest — including unit conversions and serving calculations.

Concentrate vs. Ready-to-Drink Cold Brew

Not all cold brew is the same. Here's the difference:

Type Dilution Needed Typical Ratio Storage
Concentrate Yes — always dilute 1:2 to 1:5 Fridge, 1–2 weeks
Ready-to-Drink No — drink as-is N/A Fridge, 3–5 days
Cold Brew Powder Yes — dissolve Follow package Pantry, months

How Dilution Changes Strength

The more water you add, the lighter and milder the coffee becomes. Here's a quick reference:

Ratio Concentrate % Strength Best For
1:1 50% Very strong Small servings, mixing with milk
1:2 33% Strong Iced coffee, bold taste
1:3 25% Medium Everyday drinking
1:4 20% Mild Light coffee, large batches
1:5 16.7% Very mild Tea-like, easy sipping

Serving Over Ice

If you're serving over ice, the ice will melt and add extra water. To compensate, use slightly less water in your dilution — or make your concentrate a bit stronger. A good rule of thumb: reduce your water by about 20% if serving over a full glass of ice.

Adding Milk or Cream

Milk, oat milk, and cream all count as liquid. If you plan to add 50 ml of milk to a 250 ml serving, treat that milk as part of your water volume. The calculator helps you here too: just enter your total desired volume and ratio, and adjust the water down by the amount of milk you'll add.

Scaling for Multiple Servings

The math scales linearly. If 1 serving needs 40 ml concentrate + 120 ml water, then 4 servings need 160 ml concentrate + 480 ml water. Our calculator handles this automatically when you enter the number of servings.

Storage & Freshness

Cold brew concentrate keeps well in the fridge — typically 1–2 weeks in a sealed container. Diluted cold brew is best consumed within 3–5 days. Always use clean containers and keep your brew cold. If it smells or tastes off, discard it.

Quick tip: Make a large batch of concentrate, store it in a bottle, and dilute by the glass. That way you always have fresh cold brew in seconds.

Frequently Asked Questions

The "best" ratio depends on your taste and how the concentrate was brewed. Most commercial concentrates recommend 1:2 to 1:4. Start with 1:3 and adjust. If it's too strong, add more water. If it's too weak, add less. Our calculator lets you experiment instantly.
Using a 1:3 ratio: 1 cup concentrate + 3 cups water = 4 cups cold brew. For 1:2, use 2 cups water. For 1:4, use 4 cups water. The calculator handles any unit — just enter your amount and ratio.
Absolutely. Milk, oat milk, almond milk, and cream all work. Just remember that milk adds its own flavor and sweetness. For a creamy cold brew, try 1:1 concentrate to milk. You can also mix water and milk in any proportion.
Diluted cold brew is best within 3–5 days when stored in a sealed container in the refrigerator. Concentrate lasts longer — typically 1–2 weeks. Always use clean containers and keep it cold.
Concentrate is a strong extract that must be diluted before drinking. Ready-to-drink cold brew is already diluted and can be consumed straight from the bottle. Concentrate saves fridge space and lets you customize strength per serving.
Use a 1:4 to 1:8 coffee-to-water ratio (by weight). For example, 100 g coarse coffee + 500 ml cold water. Steep 12–18 hours in the fridge, then strain. The resulting concentrate is typically diluted 1:2 to 1:4 before serving.
Yes — the more you dilute, the less caffeine per serving. A 1:1 dilution has roughly double the caffeine of a 1:3 dilution for the same volume. If you're sensitive to caffeine, use a higher water ratio.
Yes! The math is the same for any concentrate-to-water dilution. It works for espresso americano ratios, iced coffee concentrate, and even tea concentrates. Just enter your amount and desired ratio.

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