Espresso Ratio Calculator

Formula used

Espresso brew ratio compares the espresso that comes out to the dry coffee that went in:

Yield (g) = Dose (g) × Ratio
Dose (g) = Yield (g) ÷ Ratio

A ratio of 1:2 means a double shot from an 18 g dose pulls 36 g of espresso. Because espresso is mostly water, 1 g out is roughly 1 ml, so 36 g ≈ 36 ml.

Ristretto (about 1:1–1:1.5) is short, thick and intense. Normale (1:2) is the balanced default. Lungo (1:3+) is longer, lighter and more bitter if pushed too far.

Worked examples

Classic double. An 18 g dose at 1:2 yields 36 g of espresso, ideally in 27–30 seconds.

Ristretto. Keep the 18 g dose but pull to 1:1.3 for a 23 g syrupy shot.

Target a set yield. If your cappuccino recipe calls for a 40 g shot at 1:2.2, you need a dose of about 18.2 g.

How to use this calculator

1. Choose whether you are starting from your dose or your target yield.
2. Enter the amount in grams. Weigh the dose with a 0.1 g scale and the shot on a cup scale.
3. Set the brew ratio: 1:2 for a balanced double, lower for ristretto, higher for lungo.
4. Press Calculate to get the matching weight, the shot style, and a target time.
5. Adjust grind so the shot hits that yield in roughly 25–32 seconds.

Espresso ratio and style guide

Typical ratios, what they taste like, and the yield from a common 18 g dose.

These are starting points for a ~9 bar machine; dial in with taste and shot time.

Who should use this calculator

Anyone pulling shots on a home or prosumer espresso machine. If you have a scale and want repeatable shots, the dose-yield-ratio triangle is the core of espresso dialling-in. It is just as useful for milk drinks (where you often run a slightly longer ratio) as for straight shots.

What each input means

• Dose — the dry coffee in the portafilter basket, typically 7–9 g for a single and 16–20 g for a double.
• Yield — the brewed espresso in the cup, measured by weight on a scale.
• Brew ratio — yield divided by dose. This is the single most useful number for consistency.

How to dial in using the result

Lock your dose and target yield from the calculator, then use grind size to control time. If the shot reaches the target yield too fast (under ~22 s) it will taste sour and thin — grind finer. Too slow (over ~35 s) and it turns bitter and harsh — grind coarser. Change only grind until the shot lands in the 25–32 second window at your chosen ratio.

Common mistakes to avoid

• Measuring yield by volume. Crema makes volume unreliable; weigh the shot instead.
• Changing dose and grind at once. Fix the dose, then adjust grind alone.
• Ignoring basket size. An 18 g dose belongs in an 18 g basket; overfilling chokes the shot.
• Chasing a number over taste. The ratio is a guide — trust your palate for the final tweak.

Limitations of this calculator

This tool handles the dose, yield and ratio relationship only. Great espresso also depends on grind size, distribution and tamping, water temperature (around 92–96 °C), pressure (about 9 bar) and bean freshness, none of which are modelled here. Use the numbers to set a repeatable target, then refine by taste and shot time.