Coffee Ratio Calculator

Created by Łucja Zaborowska, MD, PhD candidate
Reviewed by Anna Szczepanek, PhD and Jack Bowater
Last updated: May 05, 2022

Welcome to the coffee ratio calculator! We'll take you on an exciting journey to the world of coffee measurements and unique methods of coffee preparation. ☕

We'll teach you how to calculate coffee to water ratios and show you how much coffee per cup you really need, depending on the given method.

Read on to discover how to use this tool as a: 👇

  • Cold brew ratio calculator;
  • Pour over coffee ratio calculator;
  • French press coffee ratio calculator; and
  • Chemex coffee ratio calculator.

How to calculate coffee ratios?

It's already easy, but we're gonna make it even easier:

  1. Choose your desired coffee ratio.

    We decided on 9:40, because it seems trickier than the others. 🙃

  2. Decide on the final volume of coffee you'd like to make.

    We chose 250mL (8.5 US fl oz).

  3. Let's calculate!

  • Altogether, we need 49 parts of the drink (9:40, 9+40)
  • We'll use two equations:

Coffee volume = (Total volume/Total parts) * Coffee parts

Water volume = (Total volume/Total parts) * Water parts

💡 We need to assume that 1 mL = 1 g.

The coffee-to-water ratio is 9:40, so we'll need 9 parts coffee and 40 parts water.

Coffee volume = (250 mL/49) * 9

Coffee volume = 45.9 mL = 45.9 g

Water volume = (250 mL/49) * 40

Water volume = 204.1 mL

There you go! We need 45.9 g of coffee and 204.1 mL of water.

💡 This calculation doesn't take into account the loss of water during the process. However, our coffee water calculator does take this into consideration.

While your here, you might like to take some time to look at out other caffeine-filled tools:

How to calculate French press ratio?

The typical French press coffee to water ratio is 1:12. It means, that for every 1 g of coffee we'll need 12 mL of water.

You can simply calculate how much water you'll need for a given amount of coffee, using the equation below:

Amount of water you need(mL) = Amount of coffee you have(g) * 12

How to calculate coffee ratio for espresso?

The coffee ratio for espresso is unique - due to the small amount of water we use, we need to take care of every single drop. 💧

That's why, to achieve a perfect 1:2 coffee grounds to water ratio, we need to use the 1:3.6 ratio instead. (We need to make up for water losses in the coffee machine - the so-called coffee cake absorbs about 80% of it!)

Amount of water you need(mL) = Amount of coffee you have(g) * 3.6

Still not sure about different weight & volume units? Try the grams to teaspoons tool or our volume or weight converters! 🥄

Alternative coffee chart

Does anybody needs a V60 calculator? 🍵 Let's break down all the ratios one by one!

Ristretto1:1.5The smallest coffee, also called caffè corto.
Espresso1:2Watch out for water loss! To achieve a 1:2 ratio, use 1:3.6 instead.
Lungo1:325 s, 88-92°C, results in 25 mL of coffee.
Cold Brew9:40Takes 12-24 h to make!
Moka Pot1:10Coffee from the stovetop.
Aeropress1:11Making one cup at a time.
French Press1:12The easiest to use.
V603:50So-called drip coffee.
Sinphon3:50Have you ever dreamt of becoming an alchemist?
Chemex1:17Blooming coffee in a hourglass.

Did you know that chocolate also contains caffeine? 🤔 That's one of the reasons why it's so dangerous for our pets.


How to calculate coffee beans to water ratio?

Our coffee measurements need a few assumptions:

  • 1 g = 1 mL
  • 1 coffee bean weights 0.13g (0.0046oz)

If your desired ratio is, e.g., 1:6, you'll need 1 portion of coffee and 6 portions of water.

  1. For every 1 g of coffee, you'll need 6 mL of water.
  2. For every 1 g of coffee, you'll need ~8 coffee beans.
  3. All together, you'll need around 8 coffee beans for every 6 mL of water you want to use.
Łucja Zaborowska, MD, PhD candidate
How many cups of coffee?
Coffee : water ratio
1:11 (Aeropress)
Ground coffee
US fl oz
Final coffee volume
US fl oz
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