purpose
Espresso Ratio Calculator
Dial in your espresso shots with dose, yield, and ratio calculations. Covers ristretto, normale, and lungo profiles.
Click to show tips
Try an Example
Pick a scenario to see how the calculator works, then adjust the values
Morning Drip Coffee
Two standard cups of medium-strength drip coffee.
Key values: 2 cups (6 oz each) · Medium strength · Arabica beans
Espresso Double Shot
A classic double espresso with standard extraction.
Key values: 18g dose · Normale profile · 25-30 sec pull
Cold Brew Concentrate
A batch of cold brew concentrate for the week.
Key values: 500 mL water · Strong ratio 1:4 · 18-24 hr steep
V60 Pour-Over
A single precise pour-over with bloom calculation.
Key values: 1 cup · Medium-strong · Bloom water shown
Calculate Your Perfect Brew
Select your brew method, specify servings or water volume, and choose your strength to get precise coffee measurements in grams, tablespoons, and scoops.
What Makes Espresso Different
Espresso forces hot water through finely ground coffee at 9 bars of pressure (about 130 PSI). This high-pressure, short contact time produces a concentrated shot with crema — the golden foam on top composed of emulsified oils and CO₂.
The Espresso Ratio
Espresso uses a brew ratio — the ratio of dry coffee in (dose) to liquid espresso out (yield):
| Style | Ratio | Dose → Yield | Character |
|---|---|---|---|
| Ristretto | 1:1 – 1:1.5 | 18 g → 18–27 g | Intense, syrupy, concentrated |
| Normale | 1:2 | 18 g → 36 g | Balanced, standard |
| Lungo | 1:3 – 1:4 | 18 g → 54–72 g | Lighter, more bitter |
The Dose–Yield–Time Triangle
Three interconnected variables define an espresso shot:
Dose
Grams of dry coffee. Typically 18–20 g for a double shot. Higher dose increases body and intensity.
Yield
Grams of liquid espresso. For a 1:2 ratio with 18 g dose, target 36 g of espresso.
Time
Extraction time: 25–30 seconds. Adjust grind size to hit this window — finer grind = slower, coarser = faster.
Extraction Percentage
Target: extraction, measured with a refractometer. Total dissolved solids (TDS) of well-extracted espresso is typically 8–12%:
Channeling — the most common espresso defect. If water finds a path of least resistance through cracks in the coffee puck, it over-extracts that channel while leaving the rest under-extracted. Even distribution and consistent tamping prevent it.
Frequently Asked Questions
What is the standard espresso brew ratio?
A standard double espresso (normale) uses a 1:2 ratio: 18 g of dry coffee in, 36 g of liquid espresso out, in 25-30 seconds. Ristretto uses 1:1 to 1:1.5 for a more concentrated shot, while lungo uses 1:3 to 1:4 for a lighter, longer extraction.
Why does espresso need 9 bars of pressure?
At 9 bars (about 130 PSI), water is forced through the finely ground coffee puck fast enough to extract flavors in 25-30 seconds while emulsifying oils and CO₂ into crema. Lower pressure under-extracts; higher pressure can cause channeling and bitter over-extraction.
What causes channeling in espresso and how do I fix it?
Channeling occurs when water finds a path of least resistance through cracks in the coffee puck, over-extracting that channel while leaving the rest under-extracted. Fix it by distributing grounds evenly before tamping, using a consistent tamp pressure, and ensuring the correct dose for your basket size.
How do I measure espresso extraction percentage?
Use the formula: . Measure TDS with a refractometer. Well-extracted espresso has 8-12% TDS and 18-22% extraction. Under-extracted espresso tastes sour; over-extracted tastes bitter and astringent.
How do I adjust grind size for espresso?
Grind size is the primary lever for hitting the 25-30 second extraction window. If the shot runs too fast (under 20 seconds), grind finer. If it runs too slow (over 35 seconds), grind coarser. Change by small increments and pull a test shot after each adjustment.
Related purpose Variants
Explore more purpose options
More Food & Nutrition Calculators
Explore the category