Calculateur de ratio et de réglage d'espresso

À propos de ce calculateur

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.

Comment lire vos résultats

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).

Méthode de calcul

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.

Exemple concret

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.

Questions fréquentes

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.

Sources

Révisé par l'équipe YouCalc · Dernière révision19 juin 2026