An espresso logbook needs six columns and nothing else: date, dose in, yield out, time, grind setting, and how it tasted. Those six let you reconstruct any shot and change exactly one variable next time. The reference recipe they sit around is the National Coffee Association's 1:2 ratio, 1 gram of dry coffee to 2 grams of brewed espresso, extracted in 20 to 30 seconds (NCA). Everything you write down is a distance from that.
Keep the log without the notebook
Log a shot in about ten seconds. Data stays in your browser, no account, and you can export CSV whenever you want it.
The six columns, and what each one is for
| Column | What you write | What it tells you later |
|---|---|---|
| Date | The day you pulled it | Days off roast, which is why yesterday's setting stopped working |
| Dose in | Dry grounds in grams, weighed before tamping | Whether you actually changed dose or only thought you did |
| Yield out | Liquid espresso in grams, weighed in the cup | The real ratio, which volume markings cannot give you |
| Time | Seconds from pump on to stop | Whether grind is the problem, since the NCA window is 20 to 30 seconds |
| Grind | Your grinder's number or click count | The one variable you should be moving between shots |
| Taste | Sour, dialled, bitter, or both | The direction to move next, which no number tells you |
The 20 to 30 second window and the 1:2 ratio are the NCA's published espresso figures (source). The column set itself is a method, not a published standard.
Why the log beats memory
Dialling in is a search with three knobs and one output, and human memory is terrible at search. Without a log you will change grind and dose in the same shot, get a better result, and never know which move did it. With a log you can look back and see that every good shot on this bag sat between 34g and 37g out, which turns the next bag into a starting point instead of a fresh start.
It also catches the thing nobody notices in the moment: drift. Grinders shift as burrs warm, beans change as they age past roast date, and a setting that was right on day four is often coarse by day twelve. That pattern is invisible shot to shot and obvious across twenty logged lines.
Log the recipe, not the vibe
Two rules make a log worth keeping. First, weigh both ends. Dose is set by your basket, and manufacturers publish it: Breville states an ideal dose of 18g for the Barista Express with its 54mm portafilter at 9 bar (Breville). Yield has to be weighed in the cup, because crema volume changes with roast date and makes eyeballing useless.
Second, change one thing per shot. If a shot at 18g in and 36g out runs in 18 seconds, the entry to write is a finer grind and the same recipe, not a new dose and a new ratio at once. A log full of double changes reads back as noise.
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Two of the six columns are weights and one is a stopwatch, so a scale with a built-in timer under the cup is what makes a log honest: search espresso scales with timers on Amazon. Links are searches, not stocked listings.
Related reading
FAQ
What should I record when dialling in espresso? Date, dose in grams, yield in grams, shot time in seconds, grind setting and how it tasted. Six columns are enough to reproduce or correct any shot.
What numbers am I aiming for? The NCA reference is 1 gram of dry coffee to 2 grams of brewed espresso, extracted in 20 to 30 seconds. An 18g dose at that ratio is 36g in the cup.
How many variables should I change between shots? One. If the recipe is right and the time is wrong, move grind only, and log the result before touching anything else.
Sources: the 1:2 espresso ratio and the 20 to 30 second brewing time are published by the National Coffee Association at aboutcoffee.org/brewing/espresso. The 18g ideal dose, 54mm portafilter and 9 bar extraction are Breville's published specifications for the Barista Express BES870 (breville.com). Both fetched and cached 2026-08-18. The 36g yield figure is 18 multiplied by 2.
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