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AeroPress
Brew Guide
The AeroPress is one of the most forgiving, versatile, and misunderstood brewing devices ever made. It rewards experimentation and punishes rigidity which is exactly why it belongs in every serious coffee person's hands.
Invented in 2005 by Alan Adler, the AeroPress uses a combination of immersion and pressure to extract coffee in under two minutes. What makes it unusual is that there is no single correct recipe. Variables like grind size, water temperature, steep time, and plunge pressure all interact to produce radically different cups from the same device. This guide takes you through the standard method in full detail, then arms you with the knowledge to adapt it.
Understanding the Device
How the AeroPress Works
The AeroPress consists of two cylinders: a brew chamber and a plunger. Coffee grounds and water sit together in the brew chamber for a short immersion period, then you press the plunger down, forcing the brew through a paper or metal filter into your cup.
Unlike a French Press, the AeroPress uses either paper or fine metal filters, which means less sediment and oils in the final cup. Unlike espresso, the pressure is manual and relatively low roughly 0.35 to 0.75 bar so it produces a concentrated brew rather than true espresso. The result is clean, full-bodied, and fast.
Two methods exist: the standard (upright) method and the inverted method. The standard method places the AeroPress directly on your cup with the filter cap attached. The inverted method flips the device so the plunger is at the bottom, allowing for a longer, controlled immersion before flipping and pressing. Both produce excellent results. This guide covers the standard method first, then addresses inverted in the variables section.
What You Need
Equipment
The AeroPress demands very little. Here is what you will need for a consistent, quality cup.
Brewer
AeroPress
Original, Go, or Clear. All work identically.
Grinder
Burr Grinder
Hand or electric. Avoid blade grinders uneven particle size destroys extraction consistency.
Filter
Paper or Metal
Paper gives a cleaner cup. Metal adds body and oils. Both are valid choices.
Scale
0.1g Precision
Non-negotiable for repeatable results. Eye-measuring coffee is how you get inconsistency.
Kettle
Gooseneck or Pour
Temperature control preferred. Gooseneck helps with pour precision but is not essential here.
Timer
Phone or Dedicated
Your phone works. A dedicated timer means one less distraction during the brew.
The Recipe
Starting Ratios
The AeroPress standard recipe uses a 1:15 to 1:17 coffee-to-water ratio depending on how concentrated you prefer your cup. For a single serve directly into a cup, the following numbers are a solid baseline. All measurements are for the standard upright method.
15g
Coffee
Medium-fine grind
225ml
Water
85 to 96°C
1:15
Ratio
Balanced strength
90s
Total Time
Steep + plunge
Water temperature is one of the most important variables in AeroPress brewing. Light roasts benefit from higher temperatures (92 to 96°C) to fully extract their more complex, fruit-forward compounds. Dark roasts extract easily and do better at lower temperatures (85 to 90°C) to avoid bitterness. If you don't have a thermometer, bring water to a full boil and let it rest off heat for 30 to 60 seconds: that gives you approximately 90 to 93°C.
The Method
Step by Step
Follow this sequence exactly until you have the basics dialled in. Once you understand how each step affects the cup, start experimenting with one variable at a time.
1
Rinse the Filter
Place a paper filter in the filter cap and rinse it thoroughly with hot water. This removes the papery taste that can transfer into your cup and also preheats the AeroPress and your mug at the same time. If you're using a metal filter, skip the rinse but still preheat the device.
Why it matters: A dry paper filter can impart a faint woody note to your first few millilitres of brew. Small thing, but eliminates a variable.
2
Grind and Dose
Grind 15g of coffee to a medium-fine consistency slightly coarser than espresso, finer than a standard pour over. The texture should feel like fine table salt between your fingers. Weigh your grounds after grinding, not before, especially if your grinder retains any coffee between sessions.
Grind reference: On most hand grinders, AeroPress sits around 15 to 20 clicks from closed. Dial in from there based on your shot time and taste.
3
Assemble and Set Up
Attach the filter cap to the brew chamber. Place the AeroPress directly on top of your cup or a vessel that can hold at least 250ml. Make sure the setup is stable the AeroPress should sit flush with no rocking. Place the whole assembly on your scale and tare to zero.
4
Add Coffee and Bloom
Pour your ground coffee into the brew chamber. Start your timer. Pour 30ml of hot water (double the coffee weight) over the grounds to initiate the bloom. The bloom allows CO₂ to off-gas from freshly roasted coffee, which would otherwise create an uneven extraction. Stir gently once to saturate all the grounds evenly. Wait 30 seconds.
Note: If your coffee is older than 3 weeks post-roast, it may not bloom much. This is normal. The CO₂ has already dissipated during storage.
5
Add Remaining Water
After the 30-second bloom, pour the remaining water up to 225ml total. Pour in a steady, controlled motion not too fast, not too slow. You're not doing an elaborate spiral here. You're simply filling the brew chamber. The goal is even saturation, not technique performance.
6
Stir and Steep
Give the slurry one firm stir with the paddle or a spoon to break up any dry clumps and ensure all grounds are fully submerged. Place the plunger just into the top of the brew chamber to create a slight vacuum seal this prevents dripping. Let it steep until your timer reads 60 seconds from the bloom start, or 90 seconds total including bloom.
The vacuum seal: Inserting just the tip of the plunger stops the brew from dripping through before you're ready to press. This is especially useful on lighter metal filters.
7
Press
Apply steady, even downward pressure on the plunger. You should feel moderate resistance throughout. The full press should take 20 to 30 seconds. If it plunges too easily in under 10 seconds, your grind is too coarse. If you have to lean all your weight on it, your grind is too fine. Stop pressing the moment you hear the first hiss of air this means you've pushed all the liquid through and are now forcing air through, which can add a harsh note.
Stop at the hiss. Do not try to extract every last drop. The last millilitres through an AeroPress are the most bitter.
8
Taste and Adjust
Taste the cup before adding anything. You're looking for balance: brightness without sourness, body without bitterness, and a finish that lingers pleasantly. If it's too sour, grind finer or increase water temperature. If it's too bitter, grind coarser or reduce temperature. If it's too weak, increase your dose or reduce water. If it's too strong, do the opposite. One variable at a time.
Diagnose Your Cup
Variables and Troubleshooting
The AeroPress is forgiving but it speaks to you through your cup. Here's how to read what it's telling you and correct it on your next brew.
Problem
Sour or Thin Cup
Under-extraction. Not enough dissolved from the grounds. Common in light roasts with water that's too cool, grind too coarse, or steep time too short.
Grind finer, raise water temperature by 2 to 3°C, or extend steep time by 15 seconds.
Problem
Bitter or Harsh Cup
Over-extraction. Too much dissolved, including harsh compounds. Common with very fine grind, high temperature, or pressing all the way through the hiss.
Grind coarser, lower temperature, stop pressing at the first hiss, or reduce steep time.
Problem
Gritty or Muddy Cup
Grounds passing through the filter. Happens with very fine grinds on metal filters, or a torn paper filter.
Use a paper filter, check the filter for tears, or grind slightly coarser.
Problem
Weak, Watery Cup
Low dose relative to water, or grind too coarse with short steep. Coffee isn't contributing enough.
Increase dose to 17 to 18g, reduce water slightly, or grind finer.
Problem
Very Hard to Press
Grind is too fine, creating a compressed puck that restricts flow. Over-filling the chamber also causes this.
Grind coarser by a few clicks. Do not exceed the number 4 mark on the AeroPress chamber.
Variation
Inverted Method
Want a longer, more controlled immersion without any dripping during steep? The inverted method gives you full control over steep time.
Flip the AeroPress upside down with the plunger inserted, brew as normal, then carefully flip onto your cup and press. Use caution the assembly is hot.
What I Actually
Do Differently
Most guides will tell you to follow the World AeroPress Championship recipe or some mathematically derived ratio and call it a day. I respect the science. But at the café, we've found that the AeroPress shines brightest when you stop treating it like a precision instrument and start treating it like a conversation.
The twist I keep coming back to: try brewing at 1:12 a much shorter, concentrated recipe and then diluting with hot water to taste in the cup. You're essentially making a small, punchy concentrate and adjusting the strength after extraction rather than before. It gives you enormous flexibility especially when you're serving guests who like very different strength levels from the same brew session. You pull one strong base, pour different amounts into each cup, top up with hot water. Everyone gets exactly what they want.
The other thing I tell every barista I train: stop pressing all the way down. That hiss at the end is not a finish line. It's a warning. The moment the plunger starts hissing, you've extracted everything worth extracting. The remaining liquid is the bitter edge. Leave it. You'll immediately notice a cleaner finish in your cup.
The One Thing to Remember
"The AeroPress is the one brewer that rewards you for ignoring the rules. Once you understand why each step exists, break them deliberately one at a time."
Quick Reference
AeroPress at a Glance
Coffee Dose
15 – 18g
Start at 15g
Water Volume
200 – 250ml
225ml standard
Temperature
85 – 96°C
Light roast: higher
Grind Size
Medium-Fine
Like table salt
Total Time
60 – 90s
Including bloom
Ratio
1:15
Adjust to taste
Brew Checklist
Rinse paper filter before brewing
Weigh coffee after grinding
Bloom for 30 seconds
Insert plunger tip to create vacuum seal
Press slowly over 20 to 30 seconds
Stop at the first hiss of air
Change one variable at a time when adjusting
Taste before adding milk or sugar