Guide · By The Lab · September 11, 2026
How Many Grams Is an Espresso Shot?.
Your espresso dose is the weight of ground coffee packed into the portafilter basket before you brew — for a modern double shot, that's about 18 grams in, producing roughly 36 grams of liquid espresso out over 25–30 seconds. That 1:2 ratio (yield roughly double the dose) is the current specialty-coffee standard, and it's a good default even if your machine's basket is labeled differently.
Two numbers, dose and yield, describe every espresso shot ever pulled. Everything else — grind, time, temperature — exists to get the ratio between those two numbers right.
01.Dose in vs. yield out — two different numbers
Dose is how much dry ground coffee goes into the basket, weighed before brewing. Yield is how much liquid espresso comes out, weighed in the cup after brewing. People casually say "how many grams is a shot" to mean either one, but they're different measurements describing opposite ends of the same shot — and the ratio between them is what actually determines strength and body.
Weighing both, not just one, is what separates a repeatable shot from a lucky one.
02.The modern standard: 18g in, 36g out
The specialty-coffee convention that's become the de facto home standard is an 18g dose for a double shot, yielding around 36g of espresso — a 1:2 ratio — over the 25–30 second window covered in our shot time guide. Most double-shot baskets, including the ones shipped with machines on this site, are sized around 18–20g for exactly this reason.
Nothing forces you to use exactly 18g — some baskets and beans do better at 16 or 20 — but it's the right number to start from rather than guess at.
03.The old-school numbers, if your basket disagrees
Older or traditionally styled baskets are sometimes sized smaller — a single around 7g, a double around 14g — and traditional Italian ratios tend to run tighter, closer to 1:1.5, producing a shorter, more concentrated pour than the modern 1:2 standard. Neither approach is wrong; they're different house styles.
If your machine's basket and manual specify different numbers than the ones above, that's not a contradiction to resolve — just weigh to what the basket was actually designed for.
04.Why a scale beats the fill line every time
Portafilter baskets often have a fill line or ridge suggesting "the right amount" by volume, but coffee density varies with roast level, bean origin, and even humidity — the same fill line can represent meaningfully different weights from bag to bag. A scale measures the thing that actually matters and removes the guesswork entirely.
A basic gram scale that reads to 0.1g costs about as much as two bags of decent beans and is the cheapest real upgrade to shot consistency on this entire site — see our accessories guide.
FAQ
- How many grams of coffee are in a double espresso shot?
- About 18 grams for the modern specialty-coffee standard, though some baskets and house styles run 14–20g. Weigh your specific basket rather than assuming a universal number.
- How many grams of liquid come out of a double shot?
- Roughly 36 grams, following the widely used 1:2 ratio (yield about double the dose) over 25–30 seconds. Older, more traditional styles aim for a tighter, more concentrated pour instead.
- Is the fill line on my portafilter basket accurate?
- Not reliably. Coffee density changes with roast level and freshness, so the same fill line can represent different weights from bag to bag. Weighing your dose on a gram scale is far more consistent.
- What's the difference between dose and yield?
- Dose is the dry ground coffee weighed into the basket before brewing. Yield is the liquid espresso weighed in the cup after brewing. The ratio between the two — commonly 1:2 — is what determines a shot's strength and body.