Coffee to Water Ratio Calculator

Updated

Pick your brew method, type how much coffee you have (or how much coffee you want to end up with), and get the other number in grams. Below it: where each starting ratio comes from, and how to adjust it.

Quick answer: A coffee ratio is grams of coffee to grams of water, written 1:16 (1 g coffee per 16 g water). Most filter recipes from specialty roasters land between 1:16 and 1:18: start at 1:17 for pour over, 1:18 for French press, 1:16 for a drip machine, 1:11 for AeroPress, 1:8 for cold brew concentrate and 1:2 for espresso. Then adjust to taste.

Coffee to water ratio calculator

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Change the coffee or the ratio and the water updates; change the water and the coffee updates. 1 g of water is 1 ml.

Starting ratios by brew method

These are published house recipes from specialty roasters, not laws. Use them to get a good first cup, then adjust.

MethodStart atExample recipe (source)
Pour over (V60, Kalita Wave)1:1730 g coffee, 500 g water; roaster's range 1:14 to 1:20 (Counter Culture)
Chemex1:1745 g coffee, 750 g water (1:16.7) (Counter Culture)
French press1:1845 g coffee, 800 g water, 6 minutes (Counter Culture)
Drip machine1:1663 g coffee, 1,000 g water, about four cups (Counter Culture)
AeroPress1:1118 g coffee, 200 g water (Counter Culture)
Cold brew concentrate1:8200 g coffee, 1,600 g water (300 g hot to bloom, then 1,300 g room temperature), at least 6 hours in the fridge; dilute to taste (Counter Culture)
Espresso1:218 g coffee in, 36 g of espresso out in 25 to 35 seconds; range 1:1.5 to 1:2.5 (Counter Culture)

Espresso is the odd one out: its ratio compares the dry coffee to the drink in the cup, not to the water you put in. That's why the calculator renames the water field "Espresso out" when you pick it.

How much coffee for one cup?

Weigh the water your mug actually holds. At 1:17:

Some of that water stays behind in the grounds, so the cup you pour is a little smaller than the water you brewed with.

Why weigh instead of using scoops

A scoop measures volume, and how much a scoop of coffee weighs changes with the beans, the roast and the grind. Two scoops of one bag and two scoops of the next can be noticeably different doses. A kitchen scale that reads in grams makes the ratio mean the same thing every time, which is the only way a recipe stays repeatable.

How to adjust the ratio

Change one thing at a time and write down what you changed. The home brew journal guide covers what to log so a great cup is repeatable.

☕ Save the recipe that worked

  1. In CafeConnections, open Journey and add a Coffee Log.
  2. Log the beans, roaster, roast, brew method, grind, water temperature and brew time.
  3. Put the ratio and the grams in the notes ("1:17, 20 g to 340 g"), then rate the cup and tag its flavors.

Next time you open the same beans, start from your best logged recipe instead of from zero.

CafeConnections Coffee Log entry with beans, roaster, roast level, flavor tags, and brew details

Sources

See every feature on the CafeConnections coffee journal app page.

Try it with CafeConnections — free

The coffee diary and café tracker for iPhone & Android. Log your first cup in under a minute.

QR code that opens CafeConnections in your phone's app storeOn a computer? Scan with your phone's camera to get the app.