Colin FosterBy Colin Foster

Updated November 2026

The AeroPress coffee to water ratio most home brewers start with is about 1:12, meaning 1 gram of coffee for every 12 grams of water. Following that ratio with a fine-medium grind and water near 200°F gives you a clean, balanced cup. This guide shows you how to set it up, adjust it, and fix the most common problems.

Start With the Standard AeroPress Ratio

A 1:12 ratio is a reliable starting point for a standard AeroPress brew. For a single cup, use 15 grams of coffee and 180 grams of water. For a stronger cup, move to 1:10 or 1:11, which means slightly more coffee for the same water. For a lighter cup, try 1:14 or 1:15.

Shopping for one? See our guide: 7 Best Coffee to Water Ratio French Press: Picks Compared (2026).

If you prefer working in tablespoons, a level scoop of medium-fine coffee is roughly 7 to 8 grams, so two heaping scoops land close to 15 grams. Weighing is more consistent, so use a scale if you have one. For more on converting measures, see Coffee to Water Ratio Tbsp: How Many Tablespoons Per Cup.

Dial In the Grind and Water Temperature

The AeroPress works best with a fine to medium-fine grind, something close to table salt. Grind too coarse and the coffee tastes sour and thin. Grind too fine and the plunge becomes hard and the cup turns bitter. Adjust one click at a time.

Use water between 195°F and 205°F. Let boiling water sit for 30 to 45 seconds before pouring. For a deeper look at temperature, read Coffee Water Temperature: What the Sources Recommend.

Follow a Simple Brewing Sequence

Once your ratio and grind are set, use the same steps each time so you can compare results fairly.

  1. Insert a paper filter into the cap, rinse it with hot water, and discard the rinse water.
  2. Place the AeroPress on your mug with the plunger inserted about an inch, then add the ground coffee.
  3. Pour in the hot water up to your target weight, such as 180 grams, and stir gently for 10 seconds.
  4. Attach the cap and let the coffee steep for about 90 seconds.
  5. Press slowly over 20 to 30 seconds until you hear a hiss, then stop.

Adjust the Ratio to Your Taste

Taste is the final judge. Use this table as a guide when you change one variable at a time.

What you taste Likely cause Adjustment
Sour or thin Under-extracted Grind finer or use more coffee (try 1:11)
Bitter or harsh Over-extracted Grind coarser or use less coffee (try 1:14)
Weak but not sour Too much water Reduce water or raise coffee dose
Heavy or syrupy Too strong Increase water to 1:13 or 1:14

For a broader comparison of ratios across methods, see Coffee-to-Water Ratios: Measuring for Each Method. If you also brew with a press, French Press Coffee Ratio Calculator: How to Dial In Your Brew covers a similar process.

A kitchen scale that reads in single grams makes repeating a ratio far easier than guessing with scoops. Search for digital kitchen scale with timer to find options. View on Amazon

A burr grinder gives a more even fine-to-medium grind than blade models, which matters a lot for AeroPress clarity. Search for burr coffee grinder adjustable. View on Amazon

Common mistakes and tips

  • Skipping the paper filter rinse, which can leave a papery taste in the cup.
  • Changing the grind, water and ratio all at once, which makes it impossible to tell what helped.
  • Pressing too hard or too fast, which pushes bitter compounds into the cup.
  • Using water straight off the boil, which often over-extracts a fine grind.
  • Forgetting to write down your settings, so good cups are hard to repeat.

FAQ

Is 1:12 the best AeroPress ratio?

It is a strong starting point for most people, but the best ratio depends on your beans and taste. Treat 1:12 as the baseline and adjust from there.

Can I use tablespoons instead of a scale?

Yes, though results will vary more between brews. Two heaping tablespoons of medium-fine coffee are close to 15 grams for a single cup.

Why does my AeroPress coffee taste sour?

Sour coffee is usually under-extracted, often from a grind that is too coarse or water that is too cool. Try a finer grind or slightly hotter water.

Conclusion

Start with a 1:12 AeroPress coffee to water ratio, a fine-medium grind and water around 200°F. Change one variable at a time and use taste to guide you. Once you find your ideal ratio, write it down and repeat it.

Ready to choose one?

Colin Foster

About Colin Foster

Colin Foster is part of our editorial team and reviews and edits our coffee beans & brewing methods guides, checking product details against manufacturer specifications and owner feedback.