You can buy excellent coffee beans, use good water and have an expensive coffee brewer, but your coffee can still taste disappointing if the grind size is wrong.

Grinding coffee is one of the most important steps in brewing because it determines how quickly water can extract flavour from the coffee.

The basic principle is simple.

A finer grind gives water more surface area to interact with, while a coarser grind gives water less surface area.

This means grind size has a direct effect on extraction time and flavour.

Understanding this relationship can help you make better coffee at home.

Why Does Grind Size Matter?

Coffee extraction happens when water dissolves soluble compounds from the ground coffee.

The size of the particles affects how easily water moves through the coffee and how quickly flavour compounds are extracted.

If the coffee is ground too fine for your brewing method, extraction can become too fast or the coffee bed can restrict water flow.

If the coffee is too coarse, water can pass through too quickly and leave some desirable compounds behind.

This is why choosing the right grind is so important.

What Is Fine Ground Coffee?

Fine coffee particles are small and have a greater total surface area.

Fine grinds are commonly used for brewing methods that require relatively short extraction times, particularly espresso.

Because the particles are small, water can interact with a large surface area quickly.

Fine grinding therefore needs to be controlled carefully.

If the grind is too fine, the coffee can become over-extracted and taste bitter, harsh or dry.

What Is Medium Ground Coffee?

Medium grind sits between fine and coarse.

It is commonly used for several filter brewing methods and can be a useful starting point for automatic filter coffee and some pour-over recipes.

The exact grind required depends on the brewer, coffee, filter, water and recipe.

There is no universal medium setting across all grinders.

What Is Coarse Ground Coffee?

Coarse coffee particles are larger and provide less surface area for water to interact with.

Coarse grinds are commonly associated with immersion brewing methods such as French press.

The larger particles allow for longer contact with water without extracting as aggressively as a very fine grind would.

However, extremely coarse grinding can produce weak or under-extracted coffee.

Grind Size for Espresso

Espresso generally requires a fine grind.

Espresso machines force hot water through a compact bed of ground coffee under pressure.

A useful starting point for espresso is a fine grind that allows you to achieve an appropriate extraction time and beverage yield.

For example, a common starting recipe might use 18 grams of coffee and produce approximately 36 grams of espresso.

If the shot runs too quickly and tastes sour or thin, the grind may need to be finer.

If the shot runs too slowly and tastes bitter or dry, the grind may need to be coarser.

Small adjustments can make a significant difference.

Grind Size for V60

V60 pour-over coffee generally uses a medium-fine grind, although the ideal setting depends heavily on the coffee and brewing recipe.

If the coffee drains too quickly and tastes weak or sour, try grinding finer.

If the coffee drains very slowly and tastes bitter or dry, try grinding coarser.

Water temperature, pouring technique and coffee dose also influence extraction, so grind size should not be adjusted in isolation.

Grind Size for French Press

French press commonly uses a coarse grind.

The coffee is immersed in water for several minutes, so a coarse grind helps provide controlled extraction during the longer brewing period.

If your French press tastes overly bitter or harsh, try grinding slightly coarser.

If it tastes thin and weak, a slightly finer grind may help.

Grind Size for AeroPress

AeroPress is extremely flexible.

You can use different grind sizes depending on your recipe.

A medium to medium-fine grind can be a useful starting point for many AeroPress recipes.

However, because the brewing method can be changed in many ways, there is no single correct grind.

You can adjust grind size together with brewing time, water temperature and agitation.

How to Know If Your Coffee Is Too Fine

Coffee that is too fine can produce excessive extraction or slow water flow.

You may notice a bitter, harsh, dry or astringent taste.

In pour-over brewing, the coffee may also take much longer than expected to drain.

If this happens, try making the grind slightly coarser.

Do not make a dramatic change immediately.

Small adjustments allow you to understand what is happening.

How to Know If Your Coffee Is Too Coarse

Coffee that is too coarse can produce under-extraction.

The cup may taste sour, sharp, thin or lacking in sweetness.

The brewing water may also pass through the coffee too quickly.

If this happens, try grinding slightly finer.

Again, change one variable at a time.

Grind Size Is Not the Only Variable

It is important not to blame every brewing problem on grind size.

Coffee extraction is influenced by several variables.

These include water temperature, coffee-to-water ratio, brewing time, agitation, water quality and roast level.

A very light roasted coffee may need a different approach from a dark roasted coffee.

A washed Kenyan coffee may respond differently from a naturally processed coffee.

Your grinder and brewing equipment also influence the result.

Why a Good Grinder Matters

A grinder does more than simply make coffee smaller.

A good grinder produces particles that are relatively consistent in size.

If a grinder produces a mixture of very fine particles and very large particles, the coffee can extract unevenly.

The very fine particles may become over-extracted while larger particles remain under-extracted.

This can create an unbalanced cup.

Consistency is therefore one of the most important characteristics of a good coffee grinder.

Burr Grinder vs Blade Grinder

Burr grinders crush coffee beans between two grinding surfaces.

They generally provide greater control and consistency than basic blade grinders.

Blade grinders chop coffee beans using rapidly rotating blades.

The resulting particles can vary significantly in size.

For people who want greater control over coffee brewing, a burr grinder is generally a better investment.

How to Dial In Your Coffee

Dialling in means adjusting your coffee recipe until you achieve a balanced extraction.

Start with a basic recipe.

Keep your coffee dose, water amount and temperature consistent.

Then adjust the grind according to taste.

If the coffee tastes sour and underdeveloped, try a finer grind.

If it tastes bitter and dry, try a coarser grind.

If the coffee tastes balanced, sweet and enjoyable, record your recipe.

This creates a repeatable starting point for your next brew.

Don't Change Everything at Once

One of the biggest mistakes beginners make is changing several variables simultaneously.

For example, if you change the grind, water temperature, dose and brewing time at the same time, you won't know which change affected the coffee.

Instead, change one variable at a time.

Grind size is often the easiest place to start.

Once you understand the effect of the grind, you can experiment with other variables.

Grind Coffee Immediately Before Brewing

For the best flavour, grind your coffee shortly before brewing.

Once coffee is ground, its surface area increases dramatically.

This accelerates exposure to oxygen and the loss of volatile aromatic compounds.

Whole beans therefore generally retain freshness longer than ground coffee.

If you want to get more flavour from your specialty coffee, a good grinder and fresh grinding can make a noticeable difference.

A Simple Grind Size Guide

For espresso, start with a fine grind.

For V60 and pour-over brewing, start around medium-fine.

For AeroPress, start around medium to medium-fine depending on the recipe.

For automatic filter coffee, start around medium.

For French press, start around coarse.

These are starting points rather than fixed rules.

Your coffee and equipment determine the final setting.

Final Thoughts

Grind size is one of the most powerful tools you have for improving coffee at home.

A small adjustment can change the extraction, balance and flavour of your cup.

Start with a suitable grind for your brewing method, then use taste and brewing behaviour to make adjustments.

If the coffee is sour and under-extracted, try going finer.

If it is bitter, harsh or dry, try going coarser.

Most importantly, learn to taste your coffee.

The more you experiment, the easier it becomes to understand what your coffee needs.

A good grinder, fresh beans and a consistent brewing process can take your everyday coffee to another level.

If you have ever bought Kenyan coffee, you have probably seen names such as Kenya AA and Kenya AB printed on coffee bags.

Many coffee drinkers assume that AA automatically means better coffee than AB.

The reality is more nuanced.

Kenyan coffee classification includes several grades, and the grade primarily relates to the physical characteristics of the coffee beans. While bean size can be associated with certain quality characteristics, the grade itself does not guarantee that one coffee will taste better than another.

To understand the difference between Kenya AA and Kenya AB, it helps to understand how Kenyan coffee is classified.

What Does Kenya AA Mean?

Kenya AA refers to a coffee classification based primarily on bean size.

AA beans are among the larger screen-size classifications used in Kenyan coffee.

The larger beans are often associated with premium Kenyan coffee and are widely recognised in international coffee markets.

However, AA does not simply mean:

"The best coffee in Kenya."

Cup quality depends on much more than bean size.

Factors such as altitude, coffee variety, farm practices, processing, storage, roasting and brewing all influence the final cup.

What Does Kenya AB Mean?

Kenya AB is another Kenyan coffee classification.

It generally represents a combination of bean sizes that fall into the AB classification.

AB coffee is also widely used by Kenyan coffee producers, exporters and roasters.

A well-produced Kenya AB can produce an outstanding cup, and the difference between a particular AA and AB coffee may not be obvious to a casual coffee drinker.

AA vs AB: The Basic Difference

The simplest way to understand the distinction is that AA and AB are primarily physical bean-size classifications.

They should not be treated as direct flavour rankings.

The important lesson is that size is not the same thing as cup quality.

Does Kenya AA Taste Better Than Kenya AB?

Not necessarily.

This is one of the biggest misconceptions about Kenyan coffee.

Imagine two coffees:

Coffee A: Kenya AA, poorly stored and roasted badly.

Coffee B: Kenya AB, excellent green coffee that was carefully processed, stored and roasted.

Coffee B could easily produce the better cup.

The quality of the green coffee, processing, roasting and brewing all matter.

This is why professional coffee buyers and roasters evaluate coffee through more than its grade.

What Actually Determines Coffee Quality?

Several factors influence the quality of Kenyan coffee.

1. Coffee Variety

Different Arabica varieties can have different flavour characteristics.

Kenyan coffee has historically been associated with varieties such as SL28 and SL34, as well as other varieties cultivated in the country.

2. Growing Environment

Altitude, rainfall, temperature, soil and farming conditions influence coffee development.

Kenya's high-altitude coffee-growing regions are particularly important to the country's specialty coffee identity.

3. Processing Method

Processing can dramatically influence the final flavour.

Washed coffees can display clean acidity and pronounced fruit characteristics.

Natural and experimental processing methods can create different levels of fruitiness, sweetness and body.

4. Storage

Poor storage can damage green coffee quality.

Coffee needs appropriate protection from moisture, heat, contaminants and excessive environmental exposure.

5. Roasting

Roasting transforms green coffee into the aromatic brown beans used for brewing.

A skilled roaster must develop the coffee without overwhelming its desirable characteristics.

6. Brewing

Even an excellent coffee can taste poor if it is badly brewed.

Grind size, water temperature, brewing ratio, extraction time and technique all influence the final cup.

What Flavours Can You Find in Kenyan AA and AB?

Kenyan coffees are often associated with distinctive fruit-forward and bright flavour profiles.

Depending on the coffee, you may experience:

Blackcurrant

Red berries

Grapefruit

Plum

Grape

Citrus

Floral notes

Black tea

Caramel

Brown sugar

Chocolate

Therefore, don't assume that every Kenya AA will taste the same.

The same applies to Kenya AB.

Which Is Better for Espresso?

Both AA and AB can be used for espresso.

The important factors are the coffee's flavour profile and roast development rather than the grade alone.

A Kenyan coffee with pronounced fruit and acidity can produce a distinctive espresso.

Some drinkers enjoy this style because it creates a bright, complex and unusual espresso.

Others prefer a more balanced espresso with chocolate, caramel and nutty characteristics.

Your choice should therefore be based on the cup you want to create.

Which Is Better for Filter Coffee?

Both can work extremely well for filter brewing.

Kenyan specialty coffee is particularly popular among filter coffee drinkers because brewing methods such as V60 can highlight acidity, sweetness and delicate fruit characteristics.

A well-prepared Kenyan AA or AB can produce an expressive filter coffee.

Try adjusting:

Grind size

Water temperature

Coffee-to-water ratio

Pouring technique

Total brewing time

Should You Buy Kenya AA or Kenya AB?

If you are choosing between AA and AB, don't make your decision based solely on the letters.

Look at the complete coffee information.

Check:

Origin

Where was the coffee produced?

Processing

Was it washed, natural or another processing method?

Roast date

When was it roasted?

Flavour profile

What characteristics does the roaster identify?

Roast level

Is it light, medium or dark?

Recommended brewing method

How does the roaster recommend preparing it?

These details can tell you far more about what to expect in the cup.

How to Choose Kenyan Coffee for Your Home

If you are new to Kenyan coffee, start with a coffee whose flavour profile matches your preferences.

If you enjoy bright, fruity and complex coffee, look for a lightly or moderately roasted Kenyan specialty coffee.

If you prefer chocolate, caramel and fuller-bodied flavours, look for a suitable roast profile that emphasises those characteristics.

Most importantly, buy freshly roasted coffee and store it properly.

The Bottom Line

Kenya AA and Kenya AB are both important Kenyan coffee classifications.

AA generally refers to a larger bean-size classification, while AB represents another bean-size classification.

But AA does not automatically mean better-tasting coffee than AB.

Cup quality is influenced by the entire coffee chain—from variety and growing conditions to processing, storage, roasting and brewing.

So the next time you see Kenya AA or Kenya AB on a coffee bag, look beyond the grade.

Ask:

Where is the coffee from?

How was it processed?

When was it roasted?

What does it taste like?

Those questions will help you choose better coffee.

Kenyan coffee is known for its distinctive acidity, fruit character, sweetness and complexity. But even excellent coffee can taste disappointing if it is not brewed properly.

The good news is that you don't need expensive equipment or professional barista skills to make a great cup of Kenyan coffee at home.

With fresh coffee, good water, the correct grind size and a consistent brewing method, you can produce an excellent cup in your own kitchen.

Start With Fresh Kenyan Coffee

The quality of the coffee you start with has a major influence on the final cup.

Look for freshly roasted Kenyan coffee with information about its origin, roast date, processing method and flavour profile.

Kenyan AA and AB coffees can both produce excellent cups, so don't choose coffee based on the grade alone.

For the best results, buy whole beans and grind them shortly before brewing.

Choose Your Brewing Method

There are several ways to brew Kenyan coffee at home.

Popular options include:

V60

V60

French press

AeroPress

Chemex

Espresso

Automatic filter coffee

A Simple V60 Recipe for Kenyan Coffee

Here's a practical starting recipe.

Coffee: 16 grams
Water: 250 grams
Water temperature: 92–94°C
Grind: Medium-fine
Target brewing time: Approximately 2:30–3:00 minutes

You can adjust these variables depending on the coffee and your equipment.

Step 1: Prepare Your Equipment

You will need:

Step 2: Grind Your Coffee

Weigh 16 grams of coffee and grind it shortly before brewing.

Start with a medium-fine grind.

The exact grind setting will depend on your grinder, so don't rely solely on a numbered setting.

Your goal is to achieve a balanced extraction.

If the coffee tastes very sour and thin, you may need a finer grind.

If it tastes bitter, dry or overly harsh, you may need a coarser grind.

Step 3: Bloom the Coffee

Place the ground coffee into the filter and gently shake the brewer to level the bed.

Start your timer.

Pour approximately 40–50 grams of water over the coffee.

Make sure all the grounds are wet.

Allow the coffee to bloom for approximately 30–45 seconds.

Blooming allows trapped gases to escape and helps prepare the coffee for extraction.

Step 4: Continue Pouring

After the bloom, pour the remaining water slowly and consistently.

Try to maintain a controlled pouring pattern rather than aggressively disturbing the coffee bed.

Continue until you reach approximately 250 grams of total water.

The coffee should finish brewing at around 2:30–3:00 minutes, although the ideal time can vary.

Step 5: Taste the Coffee

Let the coffee cool slightly before judging it.

As coffee cools, different flavours can become easier to identify.

With a good Kenyan coffee, you may notice characteristics such as:

Blackcurrant

Citrus

Red berries

Plum

Grape

Floral notes

Black tea

Brown sugar

Chocolate

How to Adjust Your Recipe

One of the most useful coffee skills is learning how to adjust your recipe based on taste.

If the coffee tastes sour

The coffee may be under-extracted.

Try:

Grinding finer

Increasing brewing time

Increasing water temperature slightly

The coffee may be over-extracted.

Try:

Grinding coarser

Reducing brewing time

Lowering the water temperature slightly

Try increasing the coffee dose or reducing the amount of brewing water.

If the coffee tastes too strong

Increase the brewing water slightly or reduce the coffee dose.

Make only one change at a time so you can understand its effect.

Water Matters More Than You Think

Coffee is mostly water, so the quality of your brewing water matters.

Use clean, fresh-tasting water.

Avoid water with strong odours or flavours because these can affect the coffee.

Water temperature also matters.

For many specialty coffees, a starting range of approximately 90–96°C can work well, depending on roast level and coffee characteristics.

Don't Chase a Perfect Recipe

There is no single recipe that works perfectly for every Kenyan coffee.

A washed Kenya AA may respond differently from a natural Kenya AB.

A light roast may require a different approach from a medium roast.

Your grinder, water, brewer and personal taste also matter.

Use recipes as starting points rather than rigid rules.

Try Other Brewing Methods

Once you understand the basics, experiment with different methods.

French Press

French press produces a fuller-bodied cup and is simple to use.

It can be particularly enjoyable when you want a richer and more rounded coffee experience.

AeroPress

AeroPress is highly flexible.

You can experiment with different grind sizes, brewing times, temperatures and ratios.

Chemex

Chemex produces a clean cup and can highlight delicate flavours and acidity.

Espresso

Kenyan coffee can also make a distinctive espresso.

Fruit-forward Kenyan coffees can produce an unusual and complex espresso experience when properly roasted and extracted.

Store Your Coffee Properly

Good brewing starts with good storage.

Keep roasted coffee:

In an airtight container

Away from direct sunlight

Away from excessive heat

Away from moisture

Away from strong-smelling foods

Avoid buying more coffee than you can reasonably use while it is fresh.

If you really want to improve, keep a simple record of your brews.

Write down:

Coffee: Kenya AA
Dose: 16g
Water: 250g
Temperature: 93°C
Grind: Medium-fine
Time: 2:45
Taste: Bright, fruity, sweet

The next time you brew the same coffee, you can adjust one variable and compare the result.

This is how professional coffee preparation becomes more consistent.

Final Thoughts

Brewing Kenyan coffee at home doesn't have to be complicated.

Start with fresh coffee, clean water and a reliable brewing method.

If you're using a V60, begin with a simple ratio such as 16 grams of coffee to 250 grams of water, then adjust the grind, temperature and brewing time according to taste.

Most importantly, taste your coffee and learn from every brew.

The goal isn't to follow someone else's recipe forever.

The goal is to understand your coffee well enough to create the cup you enjoy.