Coffee-to-Water Ratio Calculator

Find the coffee dose for your water from a brew ratio.

Water

Brew ratio (1 : N)

Results update as you type.

Coffee needed

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How it works

Great coffee is mostly about proportion, and this coffee-to-water ratio calculator turns your chosen brew ratio and water amount into the exact grams of coffee to grind. Specialty coffee is dialed in by weight rather than scoops, because a level scoop varies wildly between beans, and getting the ratio right is the single biggest lever on how your cup tastes. The ratio matters because it sets the strength and extraction balance of the brew. Too little coffee for the water and the cup turns thin, sour and watery; too much and it reads heavy and bitter. A widely recommended starting point is 1:16 — one gram of coffee for every sixteen grams of water — which lands in the sweet spot for pour-over and drip. A coffee-to-water ratio calculator lets you hold that proportion steady whether you are brewing a single cup or a full carafe, so results stay repeatable. The math is simple: for a 1:N ratio, the coffee weight equals the water weight divided by N. Pouring 500 grams of water at a 1:16 ratio needs 500 ÷ 16, or about 31 grams of coffee. Dropping to 1:15 makes it stronger, while moving to 1:17 or 1:18 makes it lighter, and the calculator recomputes instantly. Home brewers, pour-over and French-press fans, and anyone chasing a consistent cup use a coffee-to-water ratio calculator to weigh their dose instead of guessing with a spoon.

Formula

coffee (g) = water (g) ÷ N, for a 1:N brew ratio

A brew ratio expresses how many grams of water each gram of coffee should meet, written as 1:N. Because water dominates the weight of a cup, the coffee dose is simply the water weight divided by N. A 1:16 ratio with 500 grams of water calls for 31.25 grams of coffee. Lower N values pack more coffee into the same water for a stronger, more intense cup, while higher N values dilute it toward a lighter brew. Dividing by N keeps the strength constant no matter how much you scale the batch up or down.

Source:Specialty Coffee Association brew guidance

We review all our tools from time to time to ensure accuracy.

Worked example

Water:500Brew ratio (1 : N):16

500 g water ÷ 16 = 31.25 g of coffee for a balanced 1:16 brew.

How to use this calculator

1
Enter your values
Enter water and brew ratio (1 : n).
2
Adjust the options
Fine-tune any options to match your situation.
3
Read your result
Coffee needed updates instantly as you type — no button to press.

Frequently asked questions

What is the best coffee-to-water ratio?

A ratio of 1:16 — one gram of coffee for every sixteen grams of water — is a widely recommended starting point that produces a balanced, well-extracted cup for pour-over and drip brewing. From there you can adjust to taste: move toward 1:15 for a stronger, more intense cup, or toward 1:17 and 1:18 for a lighter, milder brew. Dialing in your preferred ratio and then keeping it constant is the key to repeatable results.

How many grams of coffee for 500 ml of water?

Since 500 millilitres of water weighs about 500 grams, a 1:16 ratio calls for roughly 31 grams of coffee, which the calculator gives as 31.25 grams. At a stronger 1:15 ratio you would use about 33 grams, and at a lighter 1:18 ratio about 28 grams. Weighing your water is the most accurate approach, but because a millilitre of water weighs a gram, you can treat the two figures as equal.

Why weigh coffee instead of using scoops?

A scoop measures volume, and the weight it holds changes with the bean's roast level, grind size and how the grounds settle, so two level scoops can differ by several grams. That variation shifts your ratio and makes the cup inconsistent from day to day. Weighing the coffee in grams on a scale fixes the dose precisely, which is why every specialty brewing guide and barista works by weight rather than by scoop.

Does grind size change the ratio I should use?

No — the ratio sets how much coffee meets the water, while grind size controls how fast that coffee extracts. You keep the same ratio and adjust grind to fix the taste: grind finer if the cup is weak or sour, coarser if it is bitter or harsh. Ratio and grind are separate dials, so use this calculator to lock the dose, then tune grind and brew time around it.

How do I scale the recipe for more cups?

Because the ratio is a proportion, scaling is straightforward: just enter the total water you want and the calculator returns the matching coffee dose at your chosen ratio. Doubling the water doubles the coffee, so a 1:16 brew that used 31 grams for 500 grams of water needs 62 grams for a litre. Keeping the ratio fixed means a big batch tastes the same as a single cup.