A manual brewer combining brief immersion steeping with gentle pressure from a plunger, pushing coffee through a paper or metal filter into a cup or carafe.
Coffee-to-water ratio
60–80 g per litre (typically 70)
Grind
Medium-fine, adjustable depending on recipe and steep time.
Water temperature, as commonly used
80-96 celsius (typically 88)°C
Contact time
60-120 seconds (typically 90)
Skill level
beginner
Descriptive grind labels like this are illustrative starting points, not precise measurements — the same label can mean different particle sizes on different grinders. See the grind size guide for how to dial this in on your own equipment.
In short
An AeroPress is a plastic cylinder with a plunger. Coffee steeps in the chamber for a minute or two, and you then push the plunger down to force the brew through a small paper filter into a cup. It was introduced in 2005 and is now one of the most widely used single-cup brewers.
It is a hybrid: the coffee is steeped like a French press, filtered through paper like a pour-over, and helped out by a little pressure. That combination makes it quick, clean and remarkably hard to get badly wrong, which is why it tolerates such a wide range of recipes.
What the pressure does, and does not, do
CoffeeHQ explanation
The pressure you generate by hand is a small fraction of what an espresso machine produces. It does not make espresso and does not create crema. What it does is move the brew through the filter in seconds instead of waiting for gravity, which lets you use a finer grind than a dripper could cope with.
A finer grind extracts faster, so the whole brew can be short. That is the practical trade the AeroPress makes: fine grind and brief contact, where a French press uses coarse grind and long contact to reach a similar strength.
A starting recipe, and how wide the range really is
Typical range
Fifteen grams of coffee to about 220 grams of water, steeped for a minute and a half, is a dependable place to start.
A starting recipe, and how wide the range really is
Variable
Typical range
What moving it does
Coffee to water
About 60–80 g per litre (roughly 1:12 to 1:17)
Stronger recipes are often brewed short and diluted with hot water afterwards.
Grind
Medium-fine, between filter and espresso
Finer for short brews, coarser for long ones. Too fine and the plunger becomes very hard to push.
Water temperature
About 80–96 °C
An unusually wide range. Cooler water gives a softer, less bitter cup and suits darker roasts.
Steep time
About 1–2 minutes before pressing
Longer steeps extract more, with diminishing effect, as in any immersion brew.
Press
About 20–30 seconds of steady pressure
Pressing harder mainly forces fine particles through. Stop when you hear the hiss of air.
Published AeroPress recipes vary enormously and many good ones fall outside these ranges. They describe the middle of common practice, not its limits.
Standard, inverted and concentrated
Tendency, not a guarantee
Standard
The brewer stands on the cup, filter down. Some liquid drips through during the steep, which matters little in practice and can be stopped by inserting the plunger slightly to form a seal.
Inverted
The brewer stands on its plunger with the filter cap uppermost, so nothing drips until you flip it onto the cup. It gives full control over steep time but involves turning over a container of very hot liquid, and it can spill or come apart. The maker strongly discourages it for that reason, citing the risk of burns. A cap with a pressure-actuated valve holds the liquid back in the same way with the brewer upright, and is the safer route to a long steep.
Concentrate and dilute
A small, strong brew made with less water and then topped up. Useful for making more than one cup from a single press, or for adding to milk or ice.
Metal filter
A reusable metal disc in place of paper lets oils and some fines through, moving the cup towards French press body and away from pour-over clarity.
The standard method
CoffeeHQ explanation
Rinse the paper and assemble. Put a filter in the cap, wet it, and screw the cap on. Stand the brewer on a sturdy cup.
Add coffee and water. Add the grounds, then pour in all the water quickly so every particle starts brewing at about the same moment.
Stir briefly and seal. Give it a few stirs, then insert the plunger just enough to stop the dripping.
Wait, then press steadily. After about a minute and a half, press down with gentle, even pressure. If it will not move, the grind is too fine; do not force it.
A recipe is a starting point: change one thing
CoffeeHQ explanation
There are more AeroPress recipes than for any other brewer, and that is the clue: none is the correct one. Pick one, brew it exactly, and then change it on purpose.
Brew one recipe exactly. Weigh the coffee and the water, time the steep, and stir and press the same way you intend to keep doing. The recipe matters less than being able to repeat it.
Notice how it ran. How much dripped through before you pressed? How hard was the press, and did you stop at the hiss? These are readings, as shot time is for espresso.
Taste, and test strength with water. If the cup is intense as well as unpleasant, add hot water a little at a time. A fault that fades was partly strength, and adding water after pressing is an ordinary part of AeroPress brewing, not a rescue.
Change one control. Choose one of the six below, move it one step, and brew again with everything else as it was. Strength first, because it is arithmetic; then grind; then time; then the rest.
Keep what worked. Write down the recipe and the one change. The next coffee starts from there, and usually needs one change, not six.
Six controls, and what each one does
CoffeeHQ explanation
Directions, not settings. The first is firm; the others are practice and interact with each other.
Ratio
Sets strength. Count all the water: what goes in the brewer and what is added afterwards. A model of steeped coffee, tested against measurements, found that strength follows the ratio while extraction settles at much the same level, so this is the control to reach for when the cup is simply weak or simply too much.
Steep time
An AeroPress steep is short, so the coffee is still giving up material quickly when you press, and a longer steep takes noticeably more. It is not the same as brew time in a pour-over: no fresh water arrives, and the gain tails off. Sharp and thin is the case for steeping longer.
Grind
Works twice. A finer grind gives up more in the same steep, and it also makes the press harder. If the plunger will barely move, the grind has gone too far whatever the cup tastes like.
Agitation
A stir wets all the coffee and speeds extraction; so does a swirl. More stirring takes more, less takes less. Above all it has to be the same each time, or the stir becomes the thing that changed.
Bypass
Brewing strong and adding hot water after pressing. It lowers strength and changes nothing about what was extracted, which makes it the cleanest way to adjust a cup that is balanced and too intense, and the way most concentrated recipes are meant to be finished.
The press
Press with light, steady pressure and stop when you hear air. A bed of fine grounds is compressible, so pushing harder packs it tighter and slows it; brewers also commonly find the last liquid forced through harsher than the rest. Never lean on a press that will not move: the brewer can slip and spill hot coffee.
Adjusting the cup
Tendency, not a guarantee
Each line is the usual first change, not the only cause. If the cup is intense as well as unpleasant, try water in the cup before any of them.
Weak and watery
Usually because: Usually too little coffee for the water, counting what is added afterwards. Sometimes a good part of the brew dripped through before pressing.
Change first: Add coffee for the same total water.
Usually because: A concentrated brew not diluted enough, a fine grind pressed hard, or a dark roast with very hot water. Water in the cup tells the first from the others.
Change first: Add hot water to the cup first. If the bitterness fades, dilute more after pressing and leave the grind; if it stays, grind a moderate step coarser.
Usually because: Often too little taken from the coffee: a coarse grind, a short steep, or cool water with a light roast. A sharp cup that is also heavy may simply be strong.
Water temperature — temperature is this brewer's most useful control, and the guide explains what it changes.
Become a barista — A structured programme from dose and grind through milk, drinks and maintenance.
Owning an AeroPress: parts, pressing, filters and care
The sections above give a recipe and what to change in it. This part is about the device: what each piece does, how to set up a new one, how hard to press and onto what, what the maker says about brewing it upside down, and how to keep the seal working.
Your maker's instructions come first. AeroPress publishes detailed answers for its own brewers, and the lines marked as the maker's come from those pages. They differ between models, most of all on what a model may be pressed onto and whether it can go in a dishwasher, so check the answers for the one you own.
I have just bought one. What do I do first?
Identify the pieces. A chamber, a plunger with a seal on its end, a filter cap, a stack of paper discs, and usually a stirrer and a scoop. Take the plunger out of the chamber to see how the seal sits.
Wash it. Warm water and washing-up liquid for the chamber, the plunger and the cap. The maker says a simple rinse is enough from day to day, because the plunger wipes the chamber as it travels.
Put a paper in the cap and the cap on the chamber. The maker's order is filter in the cap and the cap twisted onto the chamber before anything is poured. Rinsing the paper is common practice and optional.
Stand it on a sturdy mug. The maker's instruction is to press only into something sturdy and never into thin or delicate glass. For the XL models it says not to press into any glass mug or carafe.
Add coffee, then water, and stir briefly. Use the starting recipe in the section above, weighed. The maker's own starting temperatures are about 80 °C for dark roasts and 85 °C for medium and light ones; many recipes use hotter water, and it is a thing to try, not a rule.
Insert the plunger a little way and wait. Pushing the seal just into the top of the chamber stops the coffee dripping through while it steeps, in the way a finger over the end of a straw holds liquid in it.
Press gently, then taste. Steady, light pressure. If it resists, pause and let it go at its own pace. Note how hard it was to press and how the cup tastes, and change one thing next time.
What each part of an AeroPress is for
The chamber
The tube the coffee steeps in. The numbers on its side are fill marks for the maker's own recipes; a scale is more exact.
The plunger
Closes the top of the chamber, which stops the drip while the coffee steeps, and then pushes air down onto the liquid to drive it through the filter.
The seal
The flexible end of the plunger, which makes it airtight against the chamber wall. The maker says it is silicone on current brewers. It is the one part that wears.
The filter cap
Holds the filter against the end of the chamber and twists on. If it is not fully locked, coffee escapes round the edge of the filter.
The paper filter
A small disc that holds back grounds, fine particles and most of the oil that reaches it. The maker describes the result as smoother and free of grit.
A metal filter
An optional reusable disc. The maker says its stainless filter lets oils through for a somewhat fuller-bodied cup. Fine particles pass with them.
A flow-control cap
An optional cap with a valve that the maker says stays closed until you press, so nothing drips through beforehand. The maker says it does not fit the XL.
The models, and what really differs between them
Maker's instructions
The maker describes the Original, the larger XL and the travel-sized Go as polypropylene, the Clear versions as a clear plastic called Tritan, and the Premium as borosilicate glass and anodised aluminium. They brew the same way.
What differs is capacity, what each may be pressed onto and how each is washed. The maker says the XL brews two to four cups at once; that the Clear makes one ten-ounce serving and the Premium's chamber holds up to ten ounces; and that the Go's mug holds fifteen ounces. It says the Premium is hand-wash only and should not be microwaved, and asks for a little extra care with it because it is glass.
None of that changes how a recipe should be adjusted. A recipe written for one size can be scaled to another by keeping its ratio.
Brewing it upside down: what it changes, and what the maker says
Maker's instructions
In the inverted method the brewer is assembled with the plunger at the bottom, filled, capped and then turned over onto the cup to press. The maker's help page gives the reasons people do it: nothing drips through early, a long steep is fully under their control, and a coarser grind can be used.
The maker strongly discourages it. Its reason is that the brewer is less stable that way and prone to mishaps that expose the user to burns from hot liquid. In CoffeeHQ's reading, the moments that matter are filling a tall, narrow column that is standing on its plunger, and turning a full brewer over.
It is not a better method, only a different way to stop the drip. The maker offers two others that keep the brewer the right way up: push the seal about half an inch into the top of the chamber, or fit its flow-control cap. Either gives the same control of the steep without turning anything over.
Brewing a concentrate and adding water afterwards
CoffeeHQ reasoning
The chamber is small, so many recipes brew a short, strong coffee and add hot water to the cup afterwards. The added water is called bypass, because it bypasses the coffee.
Bypass changes strength and nothing else. What was taken from the coffee was decided in the chamber; the water in the cup only spreads it out. That makes it the cleanest way to test whether a cup is too strong or actually unbalanced: add water a little at a time and taste. If the fault fades, it was strength.
When counting a ratio, count all the water: what went into the chamber and what went into the cup.
What changes what in an AeroPress
Each line is a tendency and the mechanism behind it, not a promise about taste. The last part of each says what else the result depends on.
Grindfiner or coarser
Finer gives the water more surface to work on and makes the press harder; coarser makes the press easy and tends to take less in the same steep.
But it also depends on: The grinder. The maker's own advice on a press that is hard to push is that a dull or cheap grinder makes a wide spread of sizes, and the finest of them block the filter.
Ratiomore coffee or more water, counting water added afterwards
Strength follows the amounts. More coffee for the same total water is a stronger cup.
But it also depends on: Whether you add water after pressing. A concentrate and a full-chamber brew at the same total ratio do not taste identical.
Steep timelonger or shorter
A longer steep takes more from the coffee, quickly at first and then less and less. It does not keep adding strength in step with the clock.
But it also depends on: The grind and the water temperature, which set how fast the early part goes.
Agitationmore stirring, or less
A stir wets everything and speeds up what the water takes. A long or hard stir also puts more fine particles against the filter.
But it also depends on: Doing it the same way each time. An uncounted stir is an uncontrolled variable.
Water temperaturehotter or cooler
Hotter water generally dissolves more, more quickly. The maker starts lower than most brewers' guides do.
But it also depends on: The roast. Cooler water is commonly used to soften a dark roast.
Press speed and where you stopslow or fast, to the hiss or before it
A hard, fast press forces liquid through a compacted bed. The maker's wording is that pressing hard compacts the coffee into a barrier. Pressing on through the hiss pushes the last liquid out of the wet grounds.
But it also depends on: The grind. A fine grind makes a fast press impossible without force.
The filterpaper or metal
Paper holds back oil and fine particles; metal lets more of both through, which reads as more body and some silt.
But it also depends on: The grind, which decides how much there is to let through.
Water added afterwardsnone, some or a lot
Lowers strength and changes nothing about what was taken from the coffee.
But it also depends on: How strong the brew in the chamber was to begin with.
When an AeroPress goes wrong
For each thing you might notice: what to consider, since there is rarely one cause, and the first thing to try. One change, then brew again.
The cup is weak
Consider
Too little coffee for the total water, counting water added to the cup
A short steep with a coarse grind: thin and also sharp
A lot ran through before you pressed
Try first: If it is balanced and thin, use more coffee or add less water afterwards. If it is thin and sharp, steep longer before changing the grind.
A fine grind, a long steep and a hard press together
Pressing on through the hiss
A dark roast with very hot water
Try first: Add hot water to the cup a little at a time. If the harshness fades, dilute more next time and leave the grind. If it stays, grind a moderate step coarser.
A metal filter, which passes fine particles by design
The paper was not flat in the cap, or the cap was not fully locked
A grind with a lot of very fine particles
Try first: With paper, reseat the filter flat and lock the cap fully. With metal, some silt is the filter's limit; leave the last sip.
It is hard to press
Consider
A grind that is too fine
A grinder that makes a lot of very fine particles
Pressing hard, which compacts the bed further
A long, vigorous stir
Try first: Do not force it. Stop, hold steady light pressure and let it move. Next time grind a step coarser. The maker also suggests pressing down a little and holding there.
A seal that no longer grips the chamber, so air passes it
Try first: Watch whether liquid ran through before you pressed. If it did, grind finer. If air hisses past the plunger, look at the seal.
A lot drips through before pressing
Consider
The plunger was not inserted to stop the drip
The grounds were not level
The water was poured in fast
A coarse grind
Try first: A little dripping is normal; the maker puts it at a few per cent. If it is a lot, the maker's order is to level the grounds and pour slowly, and only then to grind finer.
Coffee leaks around the seal or past the plunger
Consider
A seal that has taken a set from being stored compressed
Grounds or oil on the seal or the chamber wall
A seal that has come off the plunger and not been seated fully
Try first: Clean the seal and the chamber. The maker describes a short-term remedy of warming the seal in hot water and pressing it on a flat surface to widen it; if it still does not grip, the seal needs replacing.
Coffee escapes round the filter cap
Consider
The cap is not twisted fully home
Grounds on the rim of the chamber
The paper folded or shifted as the cap went on
Try first: Wipe the rim, lay the paper flat in the cap and twist until it stops.
It is too concentrated
Consider
A recipe meant to be diluted, drunk as it came out
A lot of coffee for the water
Try first: Add hot water to the cup until it is where you like it, then weigh what you added so you can repeat it.
Each of these changes one thing and holds the rest. Brew the two side by side where you can, and write down what you notice before deciding which you prefer.
Paper against metal
Change
Brew the same recipe through a paper disc and through a metal one.
Keep the same
The coffee, the grind, the amounts, the steep and how you press.
What to notice
The weight of the cup on the tongue, how much is left at the bottom, and which flavours are easier to pick out.
A short steep against a long one
Change
Press one brew after one minute and another after three.
Keep the same
The coffee, the grind, the amounts and the stir.
What to notice
How much the longer one gains. Most of what a steep takes comes early, which this shows better than any description.
A concentrate with water added against a full chamber
Change
Brew once with all the water in the chamber, and once with half of it added to the cup afterwards.
Keep the same
The coffee, the grind, the dose and the total water.
What to notice
Whether the two cups at the same total ratio taste the same. They rarely do.
A gentle press against a firm one
Change
Press one brew slowly with light pressure and one as firmly as it allows.
Keep the same
Everything else.
What to notice
The clarity of the cup, and how much effort the firm press took for what it gave.
What to avoid with an AeroPress
Brewing inverted without understanding the risk. The maker strongly discourages it as less stable and a burn risk, and offers two ways to stop the drip with the brewer upright.Maker's instructions: AeroPress, Inc.
Pressing hard. The maker's instruction is to press gently, with no rush; it says pressing hard compacts the coffee into a barrier and makes it harder to press.Maker's instructions: AeroPress, Inc.
Pressing into thin or delicate glassware. The maker allows a glass mug or carafe only if it is sturdy, and none at all for its XL models.Maker's instructions: AeroPress, Inc.
Filling the chamber to the brim. Leave room for the plunger to enter without pushing hot liquid over the rim, and follow the fill marks the maker gives for your model.CoffeeHQ reasoning
Pressing onto a cup narrower than the brewer's base, or onto a wet, slippery surface. All of your weight is going down through it.CoffeeHQ reasoning
Pressing while the brewer and cup are standing on a scale. The maker's answers say not to, in the section on its steel model; weigh the coffee and water first, then move the cup off the scale to press.Maker's instructions: AeroPress, Inc.
Changing the grind, the steep and the temperature together. One change, then taste.CoffeeHQ reasoning
Looking after it, and the seal in particular
Every time
Eject the puck of grounds straight after pressing and rinse the end of the plunger. The maker says a simple rinse is enough for day-to-day use.Maker's instructions: AeroPress, Inc.
Do not leave the seal sitting compressed inside the chamber. The maker's help page advises storing the plunger pushed right through the chamber or out of it. Its general answers page says something different for one model: that the silicone seal of its steel brewer does not fatigue when stored compressed, as the natural rubber seals of early models could. Storing the plunger uncompressed costs nothing either way.Maker's instructions: AeroPress, Inc.
From time to time
Take the seal off the plunger now and then and wash it inside and out with warm water and washing-up liquid, as the maker recommends. The maker says a chamber that has become sticky can be washed with vinegar.Maker's instructions: AeroPress, Inc.
Dishwasher use depends on the model. The maker says most versions can go on the top rack and that its glass and aluminium Premium is hand-wash only.Maker's instructions: AeroPress, Inc.
Parts that wear
The seal
It no longer grips: the plunger slides too easily, air hisses past it, or coffee leaks above it. The maker sells replacements and says that with care a new seal should last at least three years. It gives no interval for replacing one, so go by the fit.Maker's instructions
The filter cap
Worn or cracked lugs that no longer lock firmly against the chamber. Replace it; do not press with a cap that can twist off.CoffeeHQ reasoning
Paper filters
The consumable. A metal disc replaces them and changes the cup, as above.Common practice
What else changes how it is used
Only the things that change the brewing. None of this is a list of things to buy.
A sturdy mug or the maker's carafe
The brewer is only as stable as what it stands on, and the maker's safety advice is about exactly this.
A scale
The chamber's numbers are for the maker's recipes. A scale lets you count all the water, including what goes in the cup afterwards.
A metal filter
Changes the cup towards more body and some silt. It is a different drink, not an upgrade.
A flow-control cap
Stops the drip without inverting the brewer, which is the maker's own suggested alternative.
A burr grinder
Most hard presses and muddy cups come from very fine particles, and the grinder decides how many there are.
From the first brew to knowing it well
Brew the standard way, the same way. Upright, plunger in to stop the drip, a counted stir, a gentle press. Weigh everything and repeat it until two cups match.
Use water in the cup as a test. Learn to tell a strong cup from an unbalanced one by adding water. It decides most of what to change next.
Move the steep, then the grind. Time is free to change and easy to undo. Change it first, and the grind only when time has stopped helping.
Read the press. How hard it is to push is a reading of the grind and the stir. Connect it to what the cup tastes like.
Try the variations on purpose. A metal filter, a concentrate, cooler water for a dark roast. One at a time, against a brew you know.
Produces a full-bodied, smooth cup that sits between filter and espresso in character — it is usually described as sweet and full. A paper filter gives a cleaner cup closer to pour-over; a metal filter lets more oils and fine particles through, closer to French press.
A description of the usual expectation, not a measured result. The coffee, its roast, the water and how it is brewed change the cup at least as much as the brewer does.
Derived from CoffeeHQ's own Change the Taste guidance for this method, not a marketing feature list.
Grind size
Brew or steep time
Water temperature
Agitation
Dose
Bean or roast choice
Bypass water
Freshness
Filter
Plunge / decant
Brew ratio / yield
Change the taste
Tastes sour
(AeroPress)
The brew tastes sharply sour or acidic rather than balanced, often with a thin body. Commonly that means too little was taken from the coffee, though a strong brew or a light roast can taste sharp too.
Try the first step below on its own, taste, then move to the next one only if needed.
Change
Try
Why
Watch for
FirstGrind size
Decrease: a small step finer on your grinder
Slows water through the grounds and usually increases extraction.
Too fine can make the plunge harder to press and risk muddiness.
Brew or steep time
Increase: steep 10-15 seconds longer before plunging
More contact time usually extracts more from the grounds.
—
Water temperature
Increase: a few degrees hotter, within the method's normal range
Hotter water tends to extract more quickly.
Very hot water can tip into harshness on already-fast recipes.
Agitation
Increase: one or two extra gentle stirs
More even contact between water and grounds can lift extraction.
Excess stirring can pull in fines and add muddiness.
If the coffee is a light roast, expect to need more extraction effort than a medium or dark roast at the same recipe.
When to reset: Return to your usual recipe (same dose, water, grind and time) before changing anything else, so you know what actually caused the difference.
The brew tastes harsh, dry or unpleasantly bitter. It may be that more was taken from the coffee than tastes good, or that the brew is simply strong, and a dark roast can taste this way however it is brewed.
Try the first step below on its own, taste, then move to the next one only if needed.
Change
Try
Why
Watch for
FirstGrind size
Increase: a small step coarser
Speeds up flow and usually reduces extraction.
—
Dose
Decrease: a gram or two less coffee for the same water, or a splash of hot water in the cup
Makes the cup a little weaker. In the one panel study CoffeeHQ has read, bitterness rose with strength and showed no clear link to extraction, so this is worth trying before or beside the grinder.
Go too far and the cup turns thin.
Brew or steep time
Decrease: steep 10-15 seconds less
Less contact time usually reduces extraction.
—
Water temperature
Decrease: a few degrees cooler
Cooler water extracts more slowly, which can soften harshness.
—
Bean or roast choice
Check / reset: check the roast level
Only if: Only if grind, time and temperature adjustments don't resolve it.
A very dark roast can read as bitter even at a correct recipe.
—
When to reset: Return to your usual recipe before trying a further change.
The brew is otherwise balanced but simply too intense to drink comfortably.
Try the first step below on its own, taste, then move to the next one only if needed.
Change
Try
Why
Watch for
FirstBypass water
Increase: add hot water after brewing, in small amounts
Dilutes strength without changing how the coffee itself was extracted.
—
Dose
Decrease: use 1-2g less coffee next time
Lowers strength directly for future brews.
—
If the balance already tastes right, prefer adding water over making the grind coarser — a coarser grind changes extraction, not just strength, and can introduce sourness.
When to reset: Note the amount of bypass water you settle on so it becomes your new default.
Each step links to its own page; this is the order they belong in.
I have coffee and a brewer
You own something to brew with and want a good cup from it.
Find your brewer's page, start from its recipe, and change one thing at a time. The later steps are for when the cup is not right, and for finding out why a change worked.
1Find your brewerWhat it does to the coffee, and a starting recipe labelled as a starting point.
2Work out the amountsCoffee and water for the cup you are making; the recipe scaler follows from it.
3If the cup is not rightChoose the brewer, tick what you noticed: the quickest check, and one change.
4One change per brewThe same loop written out for filter coffee, from the first brew to a recipe you keep.
5Why the change worksStrength and extraction as two numbers, and what a taste can and cannot tell you.
6Test it yourselfHow to compare two cups so the difference is the thing you changed.
