Instant coffee does not need a grind setting because it is already fully brewed and dried. If you are using store-bought instant coffee, you skip the grinder entirely and go straight to hot water.
According to Encyclopaedia Britannica, instant coffee is coffee that has already been brewed and then dried into a soluble product, usually through freeze-drying or spray-drying. That means the coffee has already gone through the steps that grinding and brewing normally handle together.
The Craft and Science of Coffee, a coffee science reference edited by Britta Folmer and published by Academic Press, explains that instant coffee is made by extracting roasted, ground coffee in large industrial columns. The resulting liquid is then dried into soluble solids that dissolve completely in water without any further grinding needed.
Do You Need to Grind Instant Coffee at All?
No. Store-bought instant coffee is a soluble powder or crystal, and it dissolves completely in hot or cold water on its own.
The grinding step already happened at the factory, before the coffee was brewed, extracted, and dried. Running instant coffee through a grinder adds no benefit because there is nothing left to break down into finer particles.
If your kitchen setup includes a burr coffee grinder, save it for whole beans. Instant coffee and burr grinders are not a good match, and the next section explains exactly why.
What Happens If You Put Instant Coffee Through a Grinder
Instant coffee crystals are hygroscopic, which means they absorb moisture from the air quickly. Baratza’s grinder maintenance guidance for its burr grinders warns against ever putting instant coffee, pre-ground coffee, or sugared products through the burrs.
The friction and heat from the burrs cause the sugars and soluble solids in instant coffee to melt into a sticky paste. That paste gums up the burr flutes and can jam the grinder’s drive mechanism.
In some cases this can strain or damage the motor. A grinder built for roasted whole beans, like a Baratza Encore ESP grinder, is not designed to process a soluble, moisture-sensitive powder.
So the mechanical answer matches the practical one. Instant coffee and grinders do not belong together, no matter how fine or coarse the setting is.
If You Mean Brewing Coffee That Will Become Instant Coffee
Some people ask this question because they want to brew their own coffee and dry it down into an instant-style product at home. If that is your goal, a medium-fine grind is a reasonable starting point for the brewing stage.
The National Coffee Association’s grind guidance shows that grind size changes how fast water extracts flavor from coffee. Finer grinds expose more surface area and extract faster, while coarser grinds extract more slowly.
That relationship is why a medium-fine grind works as a flexible middle ground when you are brewing a batch of coffee with the intention of processing it further. It is not too fine to over-extract quickly, and not so coarse that extraction drags on.
Keep in mind that true soluble coffee, the kind that dissolves completely, cannot be made at home with a grinder and a brewer alone. It requires the same industrial extraction and freeze-drying or spray-drying process described earlier, so a home batch will taste more like strong brewed coffee than store-bought instant.
Grind Setting Needs by Instant Coffee Scenario
Use the table below to figure out whether your specific instant coffee situation actually calls for a grind setting.
| Scenario | Grind Setting Needed | What To Do Instead |
|---|---|---|
| Using store-bought instant coffee crystals or powder | None | Add hot or cold water and stir |
| Reducing instant coffee granules for baking or icing | None from a burr grinder | Use a mortar and pestle or blade spice mill |
| Brewing coffee you plan to dry into an instant-style product | Medium-fine as a starting point | Adjust finer or coarser based on taste |
| Commercial or industrial instant coffee production | None at the consumer level | Grinding and extraction happen before drying, at the factory |
Making Instant Coffee Powder Finer for Baking
If a recipe calls for finely powdered instant coffee or instant espresso powder, do not reach for a burr grinder. Serious Eats notes that instant coffee and instant espresso powder are made from brewed coffee stripped of water, and recommends pulverizing the granules with a mortar and pestle or a clean blade spice mill when a recipe needs a finer texture.
A mortar and pestle set or a dedicated blade spice grinder breaks the granules down without the heat and moisture problems a burr grinder creates.
This matters for buttercream, icing, or dry spice rubs where gritty texture is the enemy. A finer powder disperses more evenly into fat or sugar-based mixtures than whole granules do.
Sealing the granules in a plastic bag and crushing them flat with a rolling pin works too, and it avoids introducing any moisture from a wet mortar. Either method gets you a finer powder without risking any equipment.
Adjusting Grind for the Brewing Stage
If you are brewing coffee that will later be dried into an instant-style product and the result tastes sour or thin, that can indicate under-extraction. Water moved through the grounds too quickly relative to the grind size.
Adjusting your grinder finer, in small steps, gives water more surface area to work with during the same brew time. This mirrors the same starting point used for methods like an AeroPress medium-fine grind setup, which relies on a similar medium-fine range.
If the brewed coffee tastes bitter or harsh instead, that can point to over-extraction, and a coarser setting is the more useful adjustment. Coarser particles slow down how quickly water pulls flavor out of the grounds.
For an entirely different approach to fine, unfiltered coffee, some people brew Turkish-style instead of trying to replicate instant coffee. That method uses an extremely fine grind on a dedicated Turkish coffee grind setting, and the grounds settle rather than dissolve, which is a different result than true soluble instant coffee.
Either way, a digital coffee scale helps you keep your dose consistent while you dial in the grind by taste.
The Bottom Line on Grinding Instant Coffee
Instant coffee itself does not need a grind setting because it is already brewed, extracted, and dried into a fully soluble form. Putting it through a burr grinder risks gumming up the burrs and straining the motor.
If you are brewing coffee to process into an instant-style product, start with a medium-fine grind and adjust finer or coarser based on taste. For baking uses, a mortar and pestle handles fine powder needs without touching your grinder.