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Coffee Ratio Calculator – Water to Coffee

Enter your coffee dose and a golden ratio to get the exact amount of water. Everything runs in your browser — no signup.

Enter your coffee weight to see the water amount.

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How it works

What is the coffee-to-water ratio?

The brew ratio is the proportion of ground coffee to water, written as 1:N. A 1:16 ratio means 16 grams of water for every 1 gram of coffee. The 'golden ratio' for filter coffee sits between 1:15 and 1:18 — lower numbers give a stronger, heavier cup and higher numbers a lighter, more delicate one.

How to use this calculator

Weigh your coffee in grams, pick a ratio, and the calculator multiplies the two to give the water in grams. Because 1 gram of water is almost exactly 1 millilitre, the same number works as millilitres. Start at 1:16 and adjust to taste on your next brew.

Frequently asked questions

›What is the best coffee-to-water ratio?

1:16 is a reliable starting point for filter coffee. Go to 1:15 for a stronger cup or 1:18 for a lighter one.

›Is 1 gram of water the same as 1 ml?

Yes, near room temperature 1 g of water equals about 1 ml, so you can use the result as either grams or millilitres.

›What ratio should I use for espresso?

Espresso uses much tighter ratios (about 1:2). This calculator targets pour-over and drip brewing.

›Do I need a scale?

A scale gives the most consistent results, but you can approximate: a level tablespoon of ground coffee is roughly 5 g.

›Why does my coffee taste bitter or sour?

Bitterness often means too little water (over-extraction); sourness means too much water or too coarse a grind. Adjust the ratio and grind size.

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