Mahlkonig E64 WS grinder on a kitchen counter

Mahlkonig E64 WS Review: Grind-by-Weight, Sync Explained, and How It Compares

The Mahlkonig E64 WS is Mahlkonig's first home grinder that weighs every espresso dose, and the first with Grind-by-Sync, the system its cafe grinders use to correct grind size from each shot. At $1,199 it sits at the top of the home grinder market alongside the Eureka Atom W 65 and the Fiorenzato AllGround Sense. This review covers what it does, how Sync actually works at home, what changed in the 2026 production, and who should buy something else.

The short version

  • Buy it if you pull espresso every day, mostly from one coffee at a time, and want every dose to land on your recipe without a separate scale.
  • Add the Sync Scale if you want the grinder to correct grind size for you as beans age. It's optional, and the grinder is complete without it.
  • Look elsewhere if you switch beans several times a day (a single-dose grinder fits better) or you also brew filter from the same grinder.

What the E64 WS does

The E64 WS grinds on demand from a 250 g hopper into a portafilter resting on a built-in scale. You set a target dose and the grinder stops when it reaches it. Timed grinders estimate the dose from run time, and that estimate drifts as the hopper empties and beans age, so the same setting gives a slightly different dose from week to week. Weighing removes that drift, which is the most common reason home shots wander.

The grinder recognizes portafilters by weight, stores recipes with their grind setting, and guides you through dialing in a new coffee on screen. Grind size is set electronically: Mahlkonig's Disc Distance Detection measures the gap between the burrs, so a setting you save is the same burr position when you come back to it. Zero calibration takes a few seconds and needs no tools.

Key specifications

  • Burrs: 64 mm special steel flat burrs, the same size as Mahlkonig's X64 SD
  • Burr speed: 1,950 rpm
  • Grinding speed: about 2 to 3.5 g per second, fine to coarse
  • Hopper: about 250 g
  • Power: 100 to 120 V, 200 W
  • Net weight: 12.8 lb (5.8 kg)
  • Connectivity: Mahlkonig Sync app (iOS and Android) for firmware updates, grind logs and Sync pairing
  • Colors: matte black or matte white
  • Warranty: 1-year Mahlkonig parts warranty

Grind-by-Sync at home, explained

Grind-by-weight fixes the dose. Grind-by-Sync fixes the other variable, grind size. After each shot, a connected device reports how the shot ran, and the grinder moves its burrs finer or coarser so the next shot comes back to your target time and yield. In a cafe this keeps recipes stable across a whole day of temperature and humidity changes. At home it does the same job as beans age through the bag.

At home there are two ways to connect it:

  • Mahlkonig's Xenia espresso machine, which has Brew-by-Sync built in and measures each shot itself.
  • The Mahlkonig Sync Scale with any espresso machine. It sits under the cup, weighs the shot, and sends the result to the grinder over Wi-Fi through the Sync app.

Two points matter before you buy. First, third-party espresso scales such as Acaia or Varia don't feed Grind-by-Sync, so if you already own one, the Sync Scale would be a second scale on the drip tray. Second, the Sanremo and La Marzocco machines that connect to Mahlkonig Sync are paired with its cafe grinders, the E65 and E80 GbS. If you own one of those machines, talk to us before counting on a direct connection to the E64 WS.

You don't have to decide on day one. The E64 WS is a complete grind-by-weight grinder without Sync, and the scale can be added later. If you want both from the start, the E64 WS & Sync Scale bundle pairs them.

What changed in the 2026 production

E64 WS grinders built after April 2026 ship with a redesigned metal flapper at the grind chute and an updated portafilter fork. Mahlkonig made both changes after feedback from the first production runs, and early reviews noted the flapper on only some units. Grinders shipped by Crawford Espresso come from the current batch.

How it compares

E64 WS vs Mahlkonig X64 SD

Same burr size and the same family, but a different way of working. The X64 SD is a single-dose grinder: you weigh beans on a scale, grind them all, and nothing stays in the hopper. It costs about half as much and suits anyone who changes coffee often. The E64 WS suits someone who loads a hopper and wants the grinder to do the weighing.

E64 WS vs Mahlkonig X54

The X54 is a timed, 54 mm all-round grinder for espresso and filter at a much lower price. It doesn't weigh doses. Choose it for mixed brewing on a budget, and the E64 WS for espresso precision.

E64 WS vs Eureka Atom W 65

The Atom W 65 also grinds by weight, on 65 mm burrs with a 1.2 kg hopper, and has a reputation for quiet grinding. It's a much bigger machine at about 21 inches tall and over 26 lb, and it has no Sync option. Choose it for capacity; choose the E64 WS for footprint and automatic grind correction.

E64 WS vs Fiorenzato AllGround Sense

The AllGround Sense weighs doses on 64 mm M340 steel burrs and grinds for filter as well as espresso. If one grinder has to cover pour-over and espresso, it's the stronger choice. If espresso is the whole job, the E64 WS adds Sync and Mahlkonig's dial-in tools.

E64 WS vs Mahlkonig E65W GbS

The E65W GbS is the cafe version of the same idea: weighed doses and Grind-by-Sync on 65 mm burrs, built for service volume. It's worth considering only if the grinder will serve a small cafe or an office pulling dozens of shots a day.

What we like

  • Weighed doses with no separate scale or dosing cup in the workflow
  • Electronic burr positioning, so saved recipes return to exactly the same setting
  • Portafilter recognition and guided dial-in on screen
  • A compact body for a grind-by-weight grinder, with a swiveling spout for any portafilter
  • An upgrade path to automatic grind correction through the Sync Scale

What to consider

  • Full Grind-by-Sync needs the Sync Scale (or a Xenia machine) on top of the grinder price
  • Third-party scales don't integrate with Sync
  • A hopper grinder is less suited to switching beans several times a day than a single-dose grinder
  • It's an espresso grinder; for filter as well, look at the AllGround Sense or the X54
  • Pairing through the Sync app takes some patience the first time

Verdict

The E64 WS brings the two things that make Mahlkonig's cafe grinders consistent, weighed dosing and Sync, to a home counter at a price close to its grind-by-weight rivals. For a home barista who pulls espresso daily from one coffee at a time, it removes the two biggest sources of shot-to-shot drift. Buy it on its own for weighed doses, and add the Sync Scale if you want the grinder to keep dialing itself in as your beans age.

The Mahlkonig E64 WS ships from Crawford Espresso, an authorized Mahlkonig dealer, with free shipping and the full manufacturer's warranty. If you aren't sure whether it suits your machine or your routine, our advisors can help by phone or text.

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