Free Tool
Espresso Ratio Calculator
Dose in, yield out. Get a target weight and extraction window instead of guessing at the cup.
Weigh the liquid espresso in the cup, not the volume — crema makes volume unreliable. Targets are starting points; taste decides. These figures assume a standard 9 bar machine and a basket matched to your dose.
Why ratio beats volume
A "double shot" is not a fixed amount. What defines a shot is the brew ratio: the weight of dry coffee against the weight of liquid espresso it produces. An 18 g dose pulled to 36 g is a 1:2 normale; the same dose pulled to 27 g is a ristretto, and it will taste sweeter, heavier, and less developed.
Because crema is mostly gas, judging by the volume in the cup is unreliable — two shots of identical volume can differ by several grams of actual liquid. A scale under the cup removes the guesswork, and is the single cheapest upgrade to shot consistency.
The three variables, in the order to change them
- Fix the dose. Pick a dose your basket is designed for and stop moving it. Changing dose changes everything downstream.
- Fix the ratio. Decide the yield you are aiming for and weigh to it every time.
- Adjust the grind. Grind is the only variable you should be moving day to day. Too fast means grind finer; too slow, coarser.
Chasing all three at once is why shots taste different every morning. Lock the first two and the grinder becomes the only dial that matters — which is also why grinder quality dominates machine quality at most budgets.
On roast level
Lighter roasts are physically denser and less soluble, so they resist extraction and generally want a longer contact time and a finer grind. Dark roasts are brittle and extract quickly, so they run faster at the same setting. The time window above shifts accordingly.
Shopping for gear? See our espresso machine and grinder guides for measured prices and picks.