Coffee Brew Ratio
Calculate the perfect coffee-to-water ratio for any brewing method. Get precise gram measurements for pour-over, espresso, French press, AeroPress, and cold brew.
About this calculator
Every brewing method extracts coffee at a different rate, which is why the same coffee-to-water ratio that makes a balanced pour-over would taste dangerously weak as an espresso and impossibly bitter as a French press. This calculator starts from your total water volume -- Number of Cups multiplied by Cup Size -- and applies the ratio associated with your chosen Brew Method to find how many grams of coffee to use. Pour Over uses a relatively lean 1:16 ratio (one part coffee to sixteen parts water), French Press sits close behind at 1:15, AeroPress is more concentrated at 1:12, Cold Brew concentrate is stronger still at 1:8, and Espresso is the most concentrated of all at 1:2, reflecting how little water passes through a small, tightly packed puck of grounds.
Both Number of Cups and Cup Size push Coffee Needed up in direct proportion -- doubling either one doubles the total water volume and, with it, the grams of coffee required for the same Brew Method. Water Needed is calculated purely from Number of Cups and Cup Size and never changes with Brew Method, since it represents the total water volume regardless of how concentrated the final coffee-to-water ratio ends up being.
Inputs
Results
Coffee Needed
31.3 g
How to Use This Calculator
- Enter the number of cups you want to brew and your cup size in mL.
- Select your brew method (pour over, espresso, French press, AeroPress, or cold brew).
- The calculator shows coffee weight in grams, water needed in mL, approximate tablespoons, and the brew ratio used.
- Grind coffee to the appropriate fineness for your method and measure the displayed gram amount for consistent results.
How the result changes with Number of Cups
| Number of Cups | Coffee Needed |
|---|---|
| 1 | 15.6 g |
| 1.5 | 23.4 g |
| 3 | 46.9 g |
| 5 | 78.1 g |
What each input means
- Number of Cups
- How many cups of coffee you want to brew.
- Cup Size (mL)
- Volume of one cup in milliliters. A standard mug is ~250 mL, espresso is ~30 mL.
- Brew Method
- Each method uses a different coffee-to-water ratio.
How this is calculated
Worked example, using the default values
- Identify Input ParametersNumber of Cups = 2, Cup Size (mL) = 250, Brew Method = 1 = 3 input(s) provided
- Calculate Coffee Needed31.3 = 31.3
- Calculate Water Needed500 = 500
- Calculate Approx. TablespoonsApprox. Tablespoons6.3 = 6.3
Engine last updated . Checked against 1 independently-derived test — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why does espresso need so much more coffee per unit of water than pour-over?
Espresso is brewed with a 1:2 coffee-to-water ratio -- eight times more concentrated than pour-over's 1:16 -- because espresso is meant to be a small, intense shot rather than a full cup of brewed coffee. Very little water passes through a tightly packed, finely ground puck under pressure, so far more coffee is needed relative to the water volume.
Does changing the brew method affect how much water the calculator says I need?
No. Water Needed is calculated directly from Number of Cups and Cup Size only -- it's simply your total water volume. Brew Method only changes Coffee Needed, Approx. Tablespoons, and the displayed Brew Ratio, since those depend on how concentrated your chosen method's ratio is.
If I double the number of cups, does the coffee amount double too?
Yes. Coffee Needed scales in direct proportion to both Number of Cups and Cup Size, since it's simply total water volume multiplied by the selected brew method's fixed ratio. Doubling either the cup count or the cup size doubles the grams of coffee needed for the same Brew Method.
How accurate is the tablespoon conversion?
The calculator estimates roughly 5 grams of ground coffee per level tablespoon, which is a common approximation for medium-ground coffee. Actual weight per tablespoon varies with grind size and roast -- a finer grind packs more densely than a coarse one -- so a kitchen scale will always be more precise than a tablespoon measurement.
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