Espresso Basics: Dose, Yield, and Ratio
The three numbers that define every shot, and how to use them to pull better espresso at home.
7 min read
Espresso intimidates people because it happens fast and there are a lot of moving parts. But you can understand any shot with just three numbers: the dose, the yield, and the ratio between them. Once those three are clear, the rest of espresso — grind, tamp, distribution — becomes a way of hitting them consistently rather than a pile of disconnected rules.
The three numbers
- Dose: the weight of dry ground coffee you put in the basket, usually 18–20 grams for a modern double.
- Yield: the weight of liquid espresso in the cup, typically 36–40 grams for that double.
- Brew ratio: yield divided by dose. A 36 gram shot from an 18 gram dose is a 1:2 ratio.
What the ratio tells you
Espresso ratios are tighter and stronger than filter ratios because espresso is a concentrated drink. A classic modern shot is around 1:2 — pull twice the weight of your dose. Ristretto-style shots run shorter and more intense, around 1:1 to 1:1.5; lungo shots run longer and more diluted, around 1:3. Most people dialing in at home should start at 1:2 and adjust from there.
Time is a symptom, not a target
You will often hear that a shot should take twenty-five to thirty seconds. That is a useful sanity check, but time is a result of your grind, not something you set directly. Decide your dose and target yield first, then adjust the grind so the shot reaches that yield in roughly the right window. If 36 grams pours out in twelve seconds, grind finer; if it crawls and takes fifty seconds, grind coarser.
Fixing common problems
- Sour, thin, or sharp espresso usually means under-extraction — grind finer, or pull a slightly longer yield.
- Bitter, dry, or burnt-tasting espresso usually means over-extraction — grind coarser, or pull a slightly shorter yield.
- Watery and weak? Your ratio is too long; reduce the yield relative to the dose.
- Always change one number at a time and weigh your output, or you will be guessing.
Espresso lives and dies by repeatability. The baristas whose shots taste the same every time are not more talented — they are more consistent. Recording your dose, yield, and ratio for each coffee turns a good shot from a happy accident into something you can reproduce tomorrow.