Coffee Gear Picks
Grind Size for Breville Barista Express: How to Dial It In
Start at grind setting 5 with an 18 g dose, then let taste and shot time steer you. Your Barista Express does not need a secret number; it needs small, repeatable moves.
- Machine: Breville Barista Express (BES870XL)
- Grinder: built-in conical burr; 16 numbered positions plus fine/coarse ends
- Starting setting: 5 for medium roast; 6–8 for dark roast
- Recipe: 18 g in → about 36 g out (1:2)
- Target: 25–30 seconds; sour means finer, bitter means coarser
Dial in your Barista Express
Start at 5, then make one small change at a time
Step 1 Weigh
- Dose 18 g of beans
- Keep the dose fixed
Step 2 Set
- Start at outer setting 5
- Note the setting
Step 3 Pull
- Aim for 36 g out
- Watch 25–30 seconds
Step 4 Taste
- Sour: go finer
- Bitter: go coarser
Result
A balanced shot that's neither sour nor bitter and lands in the espresso zone.
What grind size should you use for a Breville Barista Express?
Start at outer setting 5 with 18 g of medium-roast beans, aiming for grounds that feel like fine table salt and a 36 g shot in 25–30 seconds. In the Home-Barista “Breville Barista Express Grind Settings” thread, owners advise starting on the side dial and moving finer one notch at a time; community reports around 4–7 are useful reference points, not Breville specifications.
What do the grind size and grind amount dials do?
These dial numbers are specific to this machine, so check yours against the wider Breville range before copying a setting from a video. The grind-size dial changes particle size: 1 is finest and 16 is coarsest. The separate grind-amount dial changes how long the grinder runs, so it affects dose rather than fineness. My Morning Espresso counts 18 outside positions when the fine and coarse ends are included; the upper burr shifts that working range when needed.
What do you need to dial in the Barista Express grinder?
You need fresh beans, the double basket, and a way to weigh both coffee and espresso. The five quick picks below cover useful extras: a scale, WDT tool, dosing funnel, bottomless portafilter, and knock box.
- Medium-roast beans and the 54 mm double basket
- A 0.1 g coffee scale (our espresso scale roundup has picks under $30)
- A timer and a clean, dry portafilter basket
Our Top Picks
How do you dial in the grind size, step by step?
Keep the dose at 18 g and change the grind by one number only; that makes each shot easy to interpret. A fast, sharp shot needs more resistance from a finer grind, while a slow, harsh shot needs less resistance from a coarser one.
1. Weigh 18 g of whole beans
Use a 0.1 g scale, not a scoop. A level-looking dose can still be a gram off, which makes it harder to tell whether grind size changed the result. Dose consistency is also where built-in grinders show their limits, and the usual upgrade path runs to a mid-range machine paired with a separate grinder.
2. Set the outer dial to 5
Write the number down before you pull a shot. This is your home base, not a finish line. Having the grinder and the machine in one body is what makes the Barista Express such a common first espresso machine: one dial to learn instead of two devices to match.
3. Grind into the double basket
A 54 mm dosing funnel keeps grounds off the counter and gives you room to stir. The Normcore funnel prevents use of the machine’s portafilter holder while installed, so hold the portafilter while grinding.
4. Break up clumps, then tamp level
Stir the grounds gently with a WDT tool, then tamp with firm, even pressure. Uneven distribution can create water channels that make a shot spray or run unpredictably.
5. Pull and weigh the shot
Stop near 36 g out in 25–30 seconds, with the gauge in the espresso zone. Use the single-wall basket for this target; the pressurized dual-wall basket is more forgiving, so its pressure reading can conceal a grind problem.
6. Taste, then move one number
Sour and fast? Go lower for finer. Bitter and slow? Go higher for coarser. Re-dose 18 g and pull again before changing anything else.
How do you adjust the internal upper burr on the Barista Express?
Adjust the upper burr only when the outside dial has nowhere useful left: setting 1–2 still gushes, or 14–16 still chokes. Breville’s “How to adjust grind size” tutorial and the Home-Barista thread describe the same basic move: empty and remove the hopper, lift out the upper burr, turn its ring one click, reseat it, then dial in again.
If the internal burr is maxed out and shots still run fast or remain inconsistent, the built-in grinder is the bottleneck. That is when the dedicated espresso burr grinders we’ve compared earn a spot beside the machine.
What common grind-size mistakes should you avoid?
Avoid changing two things at once, because a better or worse shot will not tell you why. These are the slips that waste the most beans.
- Changing dose and grind together — hold the dose at 18 g until the grind is close.
- Chasing the gauge — taste the espresso; the needle is a clue, not a score.
- Using old beans — Brewing With Dani notes that beans need a finer setting as they age.
- Keeping the same number for every roast — dark roasts often need one or two steps coarser.
- Grinding into a wet basket — moisture makes grounds stick and clump before you even tamp.
Sour or bitter shot? How should you adjust the grind?
Sour means under-extracted, so grind one step finer; bitter means over-extracted, so grind one step coarser. Keep the 18 g dose fixed, otherwise you are moving the goalposts and cannot tell which change helped.
Match the taste to the fix
Make one small move, then pull another shot
Sour
- Grind one step finer
- Watch for fast, gushing shots
Bitter
- Grind one step coarser
- Watch for slow drips and dark-red pressure
Outcome
One targeted grind change makes the next shot easy to read.
Still getting erratic shots after a grind change? Check distribution first. If it looks tidy but remains erratic, pull one shot with grounds from one of the affordable hand grinders that grind fine enough for espresso; a dramatically better shot points at the built-in burr set, not your recipe.
Frequently asked questions
What grind size should I use for my Breville Barista Express?
Start at setting 5 on the outer dial with 18 g of a medium roast. If the shot runs fast or tastes sour, go finer with a lower number. If it drips slowly or tastes bitter, go coarser. Community reports commonly land between 4 and 8.
What is the best espresso grind size for a Breville Barista Express?
There is no magic number because beans behave differently. Start at setting 5 with the factory internal-burr position, then change one step at a time until a double shot gives roughly 36 g in 25–30 seconds.
How do I adjust the grind size on my Breville Barista Express?
Turn the grind-size dial down for finer grounds and up for coarser grounds. The separate grind-amount dial changes grind time, not size. For a bigger range change, adjust the upper burr behind the bean hopper.
What grind setting should I use for the internal burr on the Barista Express?
Leave the internal upper burr at its factory position until the outside dial runs out of room. If setting 2 still gushes, move the burr one step finer. If setting 14 still chokes, move it one step coarser.
Why is my Breville Barista Express espresso sour or bitter?
Sour espresso is usually under-extracted, meaning water rushed through before grabbing enough sweetness; grind one step finer. Bitter espresso is usually over-extracted; go one step coarser. Keep the 18 g dose unchanged so the result actually tells you something.
How long should a shot take on a Breville Barista Express?
Aim for 25–30 seconds for a double yielding about 36 g. The pressure gauge should sit in the grey espresso zone. A much faster shot needs a finer grind; a slow, drippy shot needs a coarser one.
What grind setting should I use for dark roast beans on the Barista Express?
Start dark roasts at setting 6 or 7, one or two steps coarser than a medium roast. They dissolve more easily and can turn ashy fast. Keep the same 18 g dose and 25–30-second target, then adjust by taste.
Do I need a scale to dial in my Breville Barista Express?
Yes. A scale that reads 0.1 g takes the guesswork out of both dose and yield. The grinder’s amount dial can get close, but a weighed 18 g dose makes it clear whether the grind change—not an accidental extra gram—fixed the shot.