Choosing Coffee Beans and the Right Grind Size

Arabica vs robusta

Most specialty coffee is arabica, prized for its sweetness, acidity and aromatic complexity. Robusta (Coffea canephora) is hardier and higher yielding, typically contains roughly twice as much caffeine, and tastes more bitter and earthy. Robusta is common in instant coffee and some traditional espresso blends, where it adds body and crema. Good-quality robusta exists, but if a bag simply says “100% arabica,” that alone doesn’t guarantee quality.

Origin: a rough flavor map

Where coffee is grown shapes how it tastes, alongside variety, altitude, processing and roast. These are common tendencies, not rules:

Processing: washed, natural and honey

Processing is how the coffee seed is separated from the cherry, and it has a big effect on flavor.

• Washed (wet) process: fruit is removed before drying. Produces clean, bright, transparent flavors.
• Natural (dry) process: whole cherries dry in the sun with the fruit on. Produces fruity, sweet, sometimes winey flavors and heavier body.
• Honey process: some sticky fruit layer is left on during drying. Sits between washed and natural.

Roast levels

• Light roast: highlights origin character — acidity, florals and fruit. Best in pour-over and AeroPress.
• Medium roast: balanced sweetness, caramel and chocolate; very versatile.
• Dark roast: roast flavors dominate — bittersweet, smoky, heavy body. Popular for espresso with milk and cold brew.

Caffeine differences between roast levels are small; choose by flavor.

Freshness and storage

Coffee is a fresh product. Whole beans are usually at their best from a few days to about four weeks after roasting; ground coffee goes stale within hours to days because so much surface area is exposed to air.

• Buy by roast date, not just a best-before date.
• Let very fresh beans rest two or three days after roasting (longer for espresso) so excess carbon dioxide can escape.
• Store airtight, in an opaque container or the original valved bag, at room temperature, away from heat and sunlight.
• Skip the fridge. It introduces moisture and odors.
• Freeze for the long term. If you buy in bulk, freeze in airtight single-week portions and don’t refreeze.

Grind size chart

Grind size controls how fast water extracts flavor. Finer grounds extract faster and suit short brew times; coarser grounds suit long steeps.

Every grinder’s numbers are different, so use these as starting points and adjust by taste. Our method guides cover adjustments: pour-over, French press, cold brew and espresso.

Burr vs blade grinders

A burr grinder is the most valuable upgrade for home coffee. Burrs crush beans between two surfaces set a fixed distance apart, producing consistent particles. Blade grinders chop randomly, creating a mix of dust and chunks that extract unevenly, so the same cup can taste sour and bitter at once.

• Hand burr grinders: affordable, quiet, portable; great for one or two cups and for camping.
• Electric burr grinders: faster for larger batches. Espresso requires a grinder capable of very fine, small adjustments.

Reading a coffee bag

Helpful labels include roast date, origin (country, region or farm), variety, processing method, altitude and tasting notes. Tasting notes like “blueberry” describe flavors the coffee naturally evokes — there’s no added flavoring unless the bag says “flavored.”