Espresso Dose: How Many Grams of Coffee Per Shot?

What is espresso dose?

Espresso dose is the mass of ground coffee you place in the portafilter basket before tamping. It is measured in grams, but the exact number depends on your machine's basket. The Specialty Coffee Association publishes standards for espresso machine specifications through its SCA-350 standard, which guides how manufacturers design semi-automatic and automatic machines. For your own machine, the recommended dose is usually printed on the side of the basket or listed in the manual.

The dose that works for you is tied to the basket you use. Instead of starting from a fixed number, start from the basket's rated capacity, then adjust for taste. This is why a good scale is a basic tool for espresso at home. The shot ratio and grind size also play a role in how the dose extracts.

Single and double baskets

Most machines come with at least two baskets: a single basket and a double basket. The double basket is larger and holds more coffee, while the single basket is designed for one shot. Both basket sizes are machined to hold a specific range of coffee, and the capacity is often stamped on the side. Using the basket's rated dose keeps the puck consistent and helps avoid channeling.

The SCA's published standards for espresso machines, including SCA-350, define performance and specification requirements. While the standard text is behind SCA membership, its existence shows that equipment consistency is an industry priority. When you choose a machine, the portafilter size matters because it determines which baskets you can buy later. You also need to know whether your basket is pressurized or unpressurized, as that affects how the dose behaves.

• Single basket: designed for one shot, holds less coffee.
• Double basket: designed for two shots, holds more coffee.
• Basket capacity is often stamped on the side in grams.
• Using the wrong dose for the basket can cause under-extraction or channeling.

How basket size determines the right amount

The basket capacity is the target dose. If you put in too little coffee, water flows through too quickly and the shot under-extracts. If you put in too much, the puck becomes too dense and water struggles, often causing channeling. Start with the weight that matches the basket rating. Then make small changes while keeping the grind and yield steady. This trial-and-error process is the way to dial in a shot.

Your machine maker knows the size of the portafilter and baskets they supply, so trust their specification first. The SCA's work on machine standards helps ensure that basket sizes are consistent across brands, which makes it easier to switch baskets or machines without starting from scratch. A tamper that matches your basket is also essential for even extraction.

Why dose matters for flavor and caffeine

The dose affects the amount of coffee solubles in the cup, which changes strength, body, and bitterness. A larger dose generally makes a more concentrated espresso, but you also need to balance the yield. The relationship between dose and yield is the shot ratio, covered in our espresso shot ratio guide. Caffeine also scales with dose, so knowing your dose helps you manage intake. The FDA notes that 400 milligrams of caffeine per day is not generally associated with negative effects for most adults.

If you are sensitive to caffeine, you may want to track your dose and yield. The EFSA also provides guidance on safe caffeine intakes, based on body weight and single doses. But for most home espresso drinkers, the focus should be on consistency: same dose, same grind, and a scale to verify every shot.

How to find your machine's dose

Start by looking at your portafilter basket. Many baskets have their capacity stamped on the side, usually in grams. If you can't find it, check the machine's manual. If your machine has a built-in grinder, some models offer a dose setting you can adjust. For semi-automatic machines without a grinder, weigh your ground coffee every time. Use a small digital scale that reads in 0.1 gram steps for best results.

When you buy a new machine, consider the portafilter size and basket availability. Machines with a standard 58mm portafilter have a wider range of baskets and accessories. Smaller machines may still work well, but you are limited to the baskets the maker supplies. The buying guides on this site list machines by their specs, so you can compare portafilter sizes and features before you choose. See our picks for 15-bar espresso machines and semi-automatic espresso machines as starting points.

When you adjust the dose, you may also need to adjust the grind size to keep the extraction balanced. A finer grind will slow the flow, and a coarser grind will speed it up. Start with the dose that fits your basket, then use the grind to control the shot time. This interplay is why a reliable grinder is as important as the machine itself. If you are using a pressurized basket, the dose is less critical because the basket creates its own resistance, but a scale still helps you stay consistent.

What to pick for your use

Questions

How do I know the right dose for my machine?

Check the basket's stamped capacity or your machine manual. Start with that weight, then adjust based on taste.

Do I need a scale for espresso?

Yes. A scale that reads to 0.1 grams helps you hit the same dose every time, which is critical for consistency.

Can I use less coffee in a double basket to make a single shot?

Not recommended. A double basket is designed for a higher dose. Using too little will under-extract. Use a single basket if you want one shot.

Does dose affect caffeine content?

Yes. More coffee in the basket generally means more caffeine in the shot, though yield also matters.

What happens if I overdose the basket?

Water will struggle to pass through, causing channeling or a very slow shot that may taste bitter and over-extracted.

Are basket sizes standardized?

Many manufacturers follow common portafilter sizes, and the SCA has published machine standards. However, not all baskets are interchangeable, so check dimensions.