A blade grinder is a spinning blade that smashes beans in a chamber. It does not cut to a size.
Why it is bad
No size control. You control only how long it runs, and the result is always a wide spread of powder and chunks together.
Heat. High-speed blades warm the coffee.
Unrepeatable. Ten seconds today is not ten seconds tomorrow.
Where it can just about serve
French press and cold brew, where long immersion partly averages out the unevenness. The result is muddy and drinkable.
Percolators, where quality is already the least of it.
Where it cannot
Espresso. It cannot produce a bed with even resistance. Shots will gush or choke, and never taste right.
Any clean filter method. A V60 with blade-ground coffee tastes bitter and sour simultaneously, which is exactly the fines-and-boulders signature.
Getting the most from one
Pulse rather than run continuously — short bursts, shaking between them. Shake the grinder during the pulses to redistribute. Sieve the result to remove the fines, if you are committed.
Still better than pre-ground
Fresh blade-ground coffee beats week-old pre-ground, clearly. Freshness is a bigger variable than uniformity.
The upgrade
The cheapest decent hand burr grinder costs little more than a blade grinder and is transformatively better. If you own a blade grinder and any interest in coffee, that is the purchase to make.
Last reviewed 8 August 2026