Espresso Brew Ratio: 1:2 Is a Starting Point, and Italy's Standard Is Different

If you already weigh your shots, you have probably seen 1:2 described as the rule. It is a sensible convention, and Breville itself calls it the “golden standard” in its guide. Yet the only certified recipe we could find, from Italy, doesn't use it at all. Knowing that makes the number more useful, because you stop defending it and start using it.

What the ratio means

Take your dose in grams of dry coffee and compare it with your yield in grams of liquid. 18 g in and 36 g out is 1:2. Both numbers are weights, so you need a scale that reads to 0.1 g and goes under the cup. Set your own dose here and read off the yield:

Stop by weight, not by eye

Breville notes that a single is about 1 oz and a double about 2 oz, then says weighing gives a more accurate ratio. There is a simple reason. Crema is light: Illy and Navarini report foam densities of 0.40 to 0.60 g per mL. A marked shot glass counts that foam as coffee, so two shots at the same line can hold different amounts of liquid.

Compare espresso scales

The numbers side by side

Here are the yields across Breville's dose range:

Those are simple multiplications, not recommendations for your coffee. Breville's guide also says the right dose depends on your portafilter size and the coffee's roast date.

Why Italy's numbers are not a 1:3.5

It is tempting to divide 25 by 7 and call Italy's recipe a very long shot. Don't. INEI measures the cup in milliliters and counts the froth in that volume, while the ratio above uses grams of liquid. Since foam weighs so much less than coffee, the 25 ml in the cup weighs less than 25 g, by an amount that depends on how much foam it has. We found no INEI figure in grams, so we won't print a converted ratio.

The differences are real anyway. INEI's recipe is a single small dose, and its leaflet specifies water leaving the unit at about 190 °F (88 °C) and 9 bar, give or take 1, at the entry. Breville's home recipe is a double-size dose from a larger basket. Same word, different cup.

One word, several recipes. Pick the one you like.

Shot time is a readout

Keep the yield fixed and time becomes what it should be: information. Breville's guide puts an ideal shot at 25 to 30 seconds and says a good one can fall anywhere from 20 to 40 seconds. Its Bambino instruction book adds a useful detail for that machine: the first flow should start 8 to 12 seconds in, like warm honey. That gives you something to watch before the shot is over.

• Much faster than your target, and sour or thin: grind finer. See why espresso tastes sour.
• Much slower than your target, and bitter: grind coarser. See why espresso tastes bitter.
• On time, but not good: trust your tongue, then adjust the ratio.

The full method for a new bag is in our dial-in guide, and how to make espresso covers the whole shot if you are just starting out.

How to use the ratio

1. Set the dose by the basket

   Fill it to what fits, weigh it, and keep that number. Breville names 18 g for the 54 mm Barista Express and 22 g for the 58 mm Dual Boiler.

2. Start at 1:2

   Stop the shot when the scale reaches twice your dose, whatever the clock says.

3. Fix the time with the grind

   Grind is the first thing Breville says to change. Leave the ratio alone until the time is in range.

4. Then move the ratio

   Taste first, and change the yield a little at a time. Breville describes 1:1 as rich and intense, and 1:3 as more delicate. Write down what you liked.

Milk drinks and ratios

Milk changes the math, because you choose the shot and the milk separately. Starbucks' comparison page describes its flat white as “two ristretto espresso shots finished with steamed milk”, its home recipe says 2 shots of espresso, and Breville's recipes use the same espresso for a flat white and a latte. Neither is the rule, and our flat white and latte comparison shows how far the recipes differ. If you drink mostly milk, try your usual ratio first and change only the amount of milk.

The one tool this takes

You can't work with ratios without a scale. Any kitchen scale that reads to 0.1 g and fits under the cup will do. A shot scale with a timer saves you a second device on the counter. Our espresso scale comparison goes through the differences, or start from the home page if you are still setting up your bar. For the short end of the scale, read ristretto vs espresso.