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Espresso is a ratio game. Fix your dose (the grams of coffee in the basket), choose a brew ratio, and this tells you the yield to aim for in the cup, names the style — ristretto, normale or lungo — and checks your shot time. Tell it how the shot tastes and it points you at the right lever to pull next.

كيف تقرأ نتائجك

The brew ratio is yield ÷ dose. 1:2 (e.g. 18 g in, 36 g out) is the modern specialty default — "normale". Pull tighter (1:1–1:2) for a ristretto: syrupy and intense. Pull longer (1:3–1:4) for a lungo: lighter and more drinkable. Shot time is a symptom, not a setting: aim for roughly 25–30 s for a normale, but let taste lead. Sour means under-extracted (grind finer); bitter means over-extracted (grind coarser).

طريقة الحساب

Yield (g) = dose (g) × ratio. The ratio denominator classifies the style: ≤1.5 ristretto, ~2 normale, ≥2.5 lungo (boundaries are indicative). Shot time is checked against the conventional 25–30 s window. These are widely-used starting points, not standards — espresso is deliberately a moving target.

مثال تطبيقي

You dose 18 g, target a 1:2 ratio, and the shot runs 28 seconds.

Aim for 36 g in the cup — a "normale" shot, with the time right in the 25–30 s window. If it still tastes sour, grind finer; if bitter, grind coarser.

الأسئلة الشائعة

Should I chase a number or chase taste?

Taste, always. The ratio gets you in the ballpark and tells you which knob to turn; your palate makes the call. Pros change ratio and grind by flavour, not by hitting an exact second count.

My shot time is perfect but it tastes bad — why?

Time is downstream of grind, dose, distribution and puck prep. A "perfect" 27 s shot can still channel or run uneven. Fix grind and prep (WDT, level tamp) first, then read the time.

What dose should I use?

Use what fills your basket well — commonly 18–20 g in a standard double on modern machines (older SCAA spec is 14–18 g). Keep dose fixed while you dial grind and ratio so you only change one thing at a time.

Is a faster shot stronger?

Not necessarily. Strength tracks the ratio (less water out = stronger), while a fast shot usually means coarse grind or channeling and tends to under-extract — often weak AND sour. Grind finer to slow it down.

المصادر

تمت المراجعة بواسطة فريق YouCalc · آخر مراجعة19 يونيو 2026