Electric coffee grinder
De'Longhi KG 521.M
Best Electric coffee grinder – Indecent – 350 $ to 530 $
The De'Longhi KG 521.M suits coffee drinkers who want one adjustable grinder for filter coffee, French press and entry-level espresso with pressurized baskets. Buyers praise its build, controls and finish. Specialist tests find especially consistent results for filter methods.
De'Longhi KG 521.M: flexible for everyday coffee
The KG 521.M makes sense when you want adjustable grinding across several everyday brewing methods. Buyers praise its build quality, precise settings and polished stainless-steel finish. Coffee Gear Zone found it particularly consistent for filter coffee and pour-over, and suitable for French press, moka and entry-level espresso machines using pressurized filters. Its controls also let you select the number of cups and coffee strength. Kaffeemacher measured low retention at 1.4 g. The important limits are practical: the grinder is noisy according to 6 of 7 noise mentions, all 7 dispensing mentions describe grounds scattering, and 13 of 22 reliability mentions are unfavorable. Kaffeemacher also found that it cannot grind fine enough for authentic espresso with a non-pressurized basket without manual modification.
Who it’s for For home users who brew filter coffee, pour-over, French press or moka, and for owners of an entry-level espresso machine with a pressurized filter. It is less suited to unmodified, non-pressurized espresso.
What sets it apart
- Buyers frequently praise the build quality.
- The adjustable settings support different grind sizes and quantities.
- Coffee Gear Zone found consistent results for filter coffee and pour-over.
- The controls are described as clear and intuitive by buyers and Coffee Gear Zone.
- Kaffeemacher measured low coffee retention at 1.4 g.
What to know
- All 7 dispensing mentions are unfavorable: buyers report grounds spreading around the outlet and counter.
- Noise is a recurring weakness: 6 of 7 noise mentions are unfavorable.
- Reliability is a real concern in the buyer feedback: 13 of 22 reliability mentions are unfavorable.
- For authentic non-pressurized espresso, Kaffeemacher found the factory grind too coarse without manual modification.
- The price feedback is mixed, with 3 of 7 price mentions unfavorable.
What it does well
Buyers most often praise the build quality: 25 of 33 mentions are favorable. They also value the range of settings; 7 of 10 setting mentions describe precise adjustment of grind size, quantity or strength. The appearance receives 5 favorable mentions out of 6, with buyers noting the stainless-steel finish. One buyer says the controls are intuitive and maintenance is easy. These points fit a user who wants one machine for several brewing routines rather than a grinder dedicated to a single method.
Where the grind performs best
Coffee Gear Zone found the KG 521.M especially consistent for filter coffee and pour-over, and considered it suitable for French press, moka and entry-level espresso machines with pressurized filters. That matches the buyer feedback: some buyers say it grinds well across fine-to-coarse settings and appreciate the precise adjustment. Espresso is the boundary. Kaffeemacher measured extraction times of 15 to 19 seconds at the finest factory settings, below the 25 seconds recommended in that test, and concluded that the grinder is too coarse for authentic espresso in a non-pressurized basket without modification.
The reservations that matter
Dispensing is the clearest practical problem: all 7 dispensing mentions are unfavorable, describing grounds scattered around the outlet, basket or counter. Noise is also a recurring complaint, with 6 unfavorable mentions out of 7, even though one buyer found it quieter than expected. Reliability is not a minority concern in the counted feedback: 13 of 22 mentions are unfavorable, including reports of the grinder stopping after a few seconds. The price is mixed rather than settled; 3 of 7 price mentions are unfavorable. Coffee Gear Zone also notes retention and static in the chute, while Kaffeemacher measured 1.4 g of retained coffee.
What buyers report
The published tests point to a clear split between everyday filter brewing and demanding espresso.
- Coffee Gear Zone found the grind particularly homogeneous for filter coffee and pour-over in its tested range. (comes up often) DeLonghi KG521.M Review: Worth the Counter Space in 2026?
- Kaffeemacher found the factory grind too coarse for authentic espresso with a non-pressurized basket unless the grinder is manually modified. (comes up often) Test: De'Longhi KG521 - A good espresso grinder to get started?