Helpful Toolbox

Cold Brew Coffee Calculator

Tell it how much water you're steeping and your ratio, and it weighs out the coffee grounds for you — no scooping guesswork.

📖 How it works & FAQ
Lower = stronger concentrate (try 1:5). Higher = ready-to-drink (up to 1:16).
—Ground coffee—
—Tablespoons of groundsapprox, ~5 g each
—Cold water—

What the cold brew ratio means

A cold brew ratio compares the weight of ground coffee to the weight of water, written as 1:8 — one gram of coffee for every eight grams of water. Because one milliliter of water weighs almost exactly one gram, you can treat the water volume and its weight as the same number. This calculator starts from how much water you want to steep and divides by your ratio to give the exact grams and ounces of coffee to weigh out. A lower second number (like 1:5) makes a punchy concentrate you dilute with water, milk, or ice; a higher number (like 1:15) brews a lighter, ready-to-drink batch.

Concentrate vs. ready-to-drink

Most cold brew fans steep a concentrate at roughly 1:4 to 1:8, then cut it 1:1 with water or milk over ice. If you'd rather pour straight from the jar, dial the ratio up toward 1:12 to 1:16 for a milder cup. Use a coarse grind, steep 12 to 24 hours in the fridge, and strain through a filter. Weighing beats scooping because a heaping spoon of light roast weighs differently than an oily dark roast — a cheap kitchen scale makes every batch repeatable. These figures are helpful estimates, not professional barista advice, so adjust to your own taste.

How to use it

  1. Enter how much cold water you're using and pick the unit — ounces, cups (240 mL), milliliters, or liters.
  2. Set your brew ratio with the slider. Start near 1:8 for a versatile concentrate.
  3. Read off the grams and ounces of ground coffee, plus an approximate tablespoon count.
  4. Weigh your coarse-ground coffee, add the water, and steep 12–24 hours in the fridge.

FAQ

What ratio should I start with?
1:8 is a reliable concentrate you can dilute to taste. Go toward 1:5 for a stronger concentrate or 1:12–1:16 for something you can drink straight.
How many grams is a tablespoon of coffee?
Roughly 5 grams, though it varies by grind and roast. The tablespoon figure is an estimate — weigh for accuracy.
How long should I steep cold brew?
12 to 24 hours in the fridge is the usual window. Longer steeps get bolder and more bitter, so taste as you go.
Is my data uploaded anywhere?
No. Everything runs in your browser and nothing you type is sent to a server.