Espresso Shot Timer

Common uses for a espresso shot timer

Dialling in a new bag of beans
Home espresso machines
Checking grinder drift
Training consistency shot to shot

An espresso shot is timed from the moment the pump starts to the moment you stop it. The widely used window is 25 to 30 seconds to reach a 1:2 ratio — 18 g of dry coffee yielding about 36 g of liquid espresso. That window is industry convention rather than a published standard, and it exists because it is where grind, dose and pressure tend to land in balance on typical equipment.

Time on its own means nothing; time paired with a weight does. A 20-second shot that reaches 36 g and a 35-second shot that reaches the same 36 g are different extractions from the same dose, and they taste it. Weigh the liquid out as well as the dry coffee in, and read the two numbers together — the clock alone will mislead you.

What the shot time is telling you

Espresso is the most grind-sensitive brew method there is, because the water is forced through under pressure and small changes in particle size change resistance sharply. A shot that reaches its target weight too quickly means water found too easy a path: grind finer. One that takes too long means the puck is choking: grind coarser.

Adjust the grinder in small steps and pull a fresh shot after each. Changing dose and grind at the same time is the usual reason people spend a morning on a bag of coffee and end up nowhere.

Freshly roasted coffee moves

Beans within a few days of roast carry a lot of carbon dioxide, which makes shots run faster and less predictably. Most espresso settles somewhere between roughly one and three weeks after roast, and the grind setting that worked on day three will usually be wrong on day ten.

This is normal, not a fault in the coffee. It does mean that dialling in is something you repeat as a bag ages, rather than solving once.

Assumes an 18 g dose targeting a 36 g yield, a 1:2 ratio. Adjust the grind in small steps and change only one variable at a time.

Reading a shot by time and yield
What happened	Likely cause	Change
Reaches 36 g in under 20 s	Grind too coarse; water channelled	Grind finer
Reaches 36 g in 25–30 s	In the conventional window	Taste, then adjust to preference
Reaches 36 g in over 35 s	Grind too fine; puck choking	Grind coarser
Drips, barely reaches 20 g	Far too fine, or dose too high	Grind coarser and check the dose
Tastes sour at 27 s	Under-extracted despite good timing	Grind finer or raise the yield slightly
Tastes harsh and drying at 27 s	Over-extracted	Grind coarser or lower the yield

Time without a scale is not diagnostic — always weigh the liquid out as well as the coffee in.
Beans within a few days of roast run faster and less predictably; expect to re-dial as a bag ages.

Source: Coffee Standards — brewing ratio and extraction principles

Sources

Coffee Standards — brewing ratio and extraction principles , Specialty Coffee Association — accessed 2026-07-28

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❓ Frequently Asked Questions

How long should an espresso shot take?

Conventionally 25 to 30 seconds to reach a 1:2 ratio — around 36 g of espresso from an 18 g dose. That window is industry convention rather than a published standard, and it only means anything alongside a weight: the same 30 seconds yielding 20 g or 50 g are completely different extractions.

My shot runs in 15 seconds. What do I change?

Grind finer. A fast shot means water found too easy a path through the puck, and the coffee will taste thin and sour. Move the grinder in small steps and pull a fresh shot after each one rather than making several changes at once.

My shot takes 45 seconds and only drips. What is wrong?

The grind is too fine and the puck is choking, or the dose is too high for the basket. Grind coarser first, and check that your dose matches the basket size. An over-full basket restricts flow regardless of grind.

When do I start the timer — pump or first drop?

Start it when the pump starts. The gap before the first drop appears is pre-infusion, and it varies between machines, so including it keeps your own shots comparable to each other. What matters is that you always measure the same way.

Why does the same grind setting stop working after a week?

Freshly roasted beans release carbon dioxide as they age, and that changes how the puck resists water. Most espresso settles roughly one to three weeks after roast. Re-dialling as a bag ages is normal rather than a sign of a problem.

My shot is in the window but tastes sour. What now?

Timing being correct does not guarantee extraction is. Sour usually means under-extracted, so grind finer or raise the yield slightly. Harsh and drying means the opposite. Taste is the final arbiter — the clock only narrows the search.