The Best Grind Size for a Keurig Reusable Filter
For a Keurig reusable K-Cup filter, a medium grind is generally the best starting point, similar in texture to table salt or coarse sand. Some reusable-pod brands suggest a medium-fine grind instead, so it’s worth checking any guidance that came with your specific filter. Either way, the grind should sit noticeably finer than a French press grind but coarser than an espresso grind.
Why Grind Size Matters for Keurig Brewing
A Keurig forces hot water through the grounds under pressure, through a small mesh filter. That setup is fairly sensitive to grind size on both ends of the spectrum.
Too Fine: Clogging and Overflow
Grounds ground as fine as espresso or Turkish coffee can clog the mesh filter, restrict water flow, and cause the filter to overflow or leak during brewing. If your reusable filter is overflowing or brewing unusually slowly, an overly fine grind is a likely cause.
Too Coarse: Weak, Watery Coffee
Grounds ground as coarse as a French press grind tend to let water rush through too quickly, which generally results in a weak, watery, or sour cup, since there isn’t enough contact time for proper extraction. This is the same under-extraction effect covered in more general terms in the coffee grind size guide.
How to Grind Coffee for a Keurig
- Use a burr grinder if you have one, since it produces a more uniform particle size than a blade grinder and reduces excess fine sediment in the cup.
- Set the grinder to a medium grind (or medium-fine, if that’s what your specific filter brand recommends).
- Fill the reusable filter basket to its marked line, which is typically around 2 tablespoons, or roughly 10-15 grams of coffee.
- Avoid tamping or pressing the grounds down. Letting water flow through loosely packed grounds, rather than a compacted puck, generally works better for this brewing style.
Tips for a Better Cup
Beyond grind size, a few other adjustments can improve a reusable-filter brew: keeping the fill level consistent from cup to cup, using fresher whole beans rather than coffee that’s been pre-ground for a long time, and avoiding overfilling the basket past its line, which can contribute to the same clogging and overflow problems as too fine a grind.
Grinding Your Own Beans vs. Buying Pre-Ground
Grinding your own beans gives you direct control over particle size and tends to produce fresher-tasting coffee, since ground coffee loses aroma and flavor faster than whole beans. Our coffee beans vs. ground coffee guide covers that freshness-versus-convenience tradeoff in more detail if you’re still deciding which to buy. Buying pre-ground coffee is more convenient, but most pre-ground coffee sold at grocery stores, especially canister coffee, is ground quite fine, closer to what’s used for drip machines or even finer, which may be coarser or finer than ideal for a reusable Keurig filter. If you buy pre-ground coffee for a reusable filter, look for a bag labeled “medium” or “drip” grind rather than “fine” or “espresso.”
FAQ
What can I use to grind coffee beans? A burr grinder is generally preferred for consistency, since it produces a more even particle size than a blade grinder. A blade grinder will still grind coffee, but the result tends to be less consistent, with a mix of larger and smaller particles.
Will Starbucks grind coffee for you? Many Starbucks locations will grind bagged whole-bean coffee purchased in-store to a specified setting on request, though availability can vary by location, so it’s worth asking at your local store.
How fine to grind coffee for Keurig? A medium grind, similar to table salt or coarse sand, generally works best for Keurig reusable filters. Some reusable-pod brands recommend medium-fine instead; check your filter’s specific guidance if available.
What do people spray on coffee beans before grinding? Some home users add a small amount of water to whole beans before grinding (sometimes called the Ross Droplet Technique) to reduce static and clinging grounds, particularly with burr grinders. This is a workaround for static, not a requirement for good coffee.
What is the best type of coffee grind for a French press? French press generally calls for a coarse grind, distinctly chunkier than what’s used for a Keurig reusable filter. More detail on that grind size is available in the coarse ground coffee guide.
How much ground coffee do I use for 2 cups of coffee? A common starting ratio is roughly 2 to 4 tablespoons of ground coffee for about 2 cups of water, adjusted to taste. For a single reusable Keurig filter, filling to the basket’s marked line is generally a simpler way to measure than counting cups.
How do I brew fine grind coffee? Fine grind coffee is best suited to short-contact, pressure-based methods like espresso machines or stovetop Moka pots, not reusable Keurig filters, where a fine grind is more likely to clog the mesh and cause overflow.
Do reusable K-Cups work? Reusable K-Cup filters generally work well for brewing your own ground coffee in a Keurig machine, as long as the grind size, fill level, and lack of tamping follow the guidance above. Results can vary somewhat by machine and filter brand.