Espresso Ratio Guide: Dose, Yield and Shot Time

Last updated November 10, 2026 · Researched and edited by Chad Norris

An espresso ratio is the weight of dry coffee you put in compared with the weight of espresso you get out. It is the one number that ties dose, shot size and taste together, and it is the fastest way to stop guessing at the machine. This guide draws on published coffee-industry references and manufacturer manuals; it does not describe our own tasting.

Short answer: Start at 1:2 by weight: 18 g of ground coffee in, about 36 g of espresso out, in roughly 25 to 30 seconds. Go shorter (toward 1:1.5) for a more intense shot, and longer (toward 1:2.5) if it tastes sour. Change one variable at a time.

The three numbers: dose, yield and time

• Dose is the weight of dry ground coffee in the basket. Your basket sets the range. Breville’s manual suggests about 8 to 11 g for a 1-cup basket and 16 to 19 g for a 2-cup basket (Breville Barista Express instruction book).
• Yield is the weight of liquid espresso in the cup.
• Time is how long the shot runs, usually counted from when you start the pump.

Ratio = yield / dose. An 18 g dose that yields 36 g is 1:2. The Specialty Coffee Association’s survey of baristas found exactly that kind of shot to be the average: a 1:2 ratio, an 18 to 20 g dose, about 36.5 g out, 25 to 30 seconds, 9 bars and 200°F, measured by weight (SCA, 25 Magazine). It is a survey of what baristas do, not an official rule, which is why it makes a sensible place to start.

Want the math done for you? Our free espresso ratio calculator gives the target yield for any dose and ratio.

Ristretto, normale and lungo ratios

These ranges are common café conventions; they are not a fixed standard, and the names mean slightly different things in different places. Traditional Italian espresso is smaller still: summaries of the Italian Espresso National Institute’s definition give a dose of about 7 g and a cup of about 25 ml, and Cimbali’s recipe gives 8 to 10 bar and about 25 seconds (Cimbali espresso recipe).

Quick dose and yield table

Straight arithmetic. Round to the nearest gram on a kitchen scale.

Worked examples

Example 1: a 2-cup basket and a medium roast. You dose 18 g and want a normale. Target yield is 18 x 2 = 36 g. The shot reaches 36 g at 22 seconds and tastes a little sharp. Keep the dose and ratio, grind one step finer, and pull again; if it now reaches 36 g at about 27 seconds and tastes rounder, that is your recipe.

Example 2: a smaller basket. Your machine’s double basket only holds about 14 g. At 1:2 the target is 28 g. The ratio, not the absolute numbers, carries the recipe from one basket to another, which is why it is the most useful number to write down.

Example 3: a light roast that stays sour. At 18 g in and 36 g out it is still sharp even at 30 seconds. Lengthen the ratio to 1:2.5 (45 g). Light roasts often need more extraction, and a longer ratio is the simplest way to get it.

Example 4: a dark roast that tastes harsh. At 1:2 it is bitter and drying. Shorten to about 1:1.75 (32 g from 18 g) or grind a touch coarser. Dark roasts extract more easily, so they often taste better a little shorter.

Choosing a dose for your basket

The basket, not the recipe, should set your dose. Baskets are made for a range, and dosing far outside it causes problems: too little coffee leaves space above the puck and the shot runs fast, while too much can press the puck into the shower screen and choke the flow. Some practical rules:

• Start in the middle of the range the manual or basket maker gives.
• Check the headspace. After tamping, lock the portafilter in, remove it, and look at the puck. A clear imprint of the shower screen screw means the basket is overfilled.
• Keep the dose fixed once it works, and adjust ratio and grind from there.
• Single shots are harder. Small single baskets are less forgiving, so most home baristas dial in on a double and split it if they want two cups.

Why weigh instead of measuring milliliters

Fresh espresso is topped with crema, a foam of gas and oils. A shot that reads 60 ml in a glass can weigh much less, and the foam settles as you watch, so volume readings drift. A scale that reads in 0.1 g steps under the cup gives the same answer every time. Many machines’ preset 1-cup and 2-cup buttons stop by volume, which is why the same button can give different-tasting shots as your grind changes.

How to dial in with the ratio

1. Fix the dose at the middle of your basket’s range, for example 18 g in a double basket. Leave it alone while you adjust everything else.
2. Pull a 1:2 shot and note the time. Breville’s manual describes a correct extraction as about 25 to 30 seconds.
3. Taste and adjust one thing:
   • Sour, sharp, thin: usually under-extracted. Run a longer ratio (1:2.25 to 1:2.5) or grind finer. More in why is my espresso sour.
   • Bitter, harsh, drying: usually over-extracted. Run a shorter ratio or grind coarser.
   • Good but weak: shorten the ratio or raise the dose a gram.
   • Good but too intense: lengthen the ratio slightly.
4. Watch the time as a check. A 1:2 shot finishing in 15 seconds means the grind is far too coarse; one dripping past 40 seconds means it is far too fine.

The idea behind this is extraction: the share of the coffee that dissolves into the cup. The original coffee brewing control chart put good filter coffee at 18 to 22% extraction (Barista Hustle on the brewing control chart). Espresso is far stronger than filter coffee, but the logic carries over: a longer ratio extracts more, a shorter one extracts less.

Ratios on pressurized baskets

If your machine uses pressurized (dual wall) baskets, ratios still help you get repeatable shots, but grind changes do less because the basket creates its own resistance. Use the ratio to set yield and taste, and do not chase a time target too hard. Our guide to pressurized vs non-pressurized baskets explains why, and the best budget espresso machine guide notes which machines include single wall baskets.

Ratios for milk drinks

For a latte or cappuccino, a slightly shorter, more concentrated shot (around 1:1.5 to 1:2) holds its flavor better through milk. Make the espresso first, then steam; most single-boiler and thermoblock home machines cannot do both at once. Pump pressure has little to do with any of this; see 15 bar vs 20 bar espresso machines.

Writing down your recipe

Once a shot tastes right, note four things: the coffee and roast date, the dose, the yield and the grinder setting, plus the time as a check. When you open a new bag, start from that recipe and expect to adjust the grind a little; roast level and age change how fast the coffee extracts. A simple note on your phone saves a lot of wasted coffee.

Mistakes to avoid

• Changing dose and grind together. You cannot tell which change helped.
• Using the cup’s markings. Crema makes volume unreliable; weigh it.
• Treating 25 to 30 seconds as the goal. It is a guide; taste decides.
• Overfilling the basket. A dose well above the basket’s range can leave the puck touching the shower screen; stay within the basket’s suggested dose.
• Skipping the scale under the cup. Without yield, the ratio is a guess.