Pour-over is simple, which is also why small mistakes show up so clearly in the cup. The good news: almost every disappointing cup comes from one of the same ten mistakes, and each one has a quick fix. Start with the chart, then jump to the mistake that matches your cup.
Start here: what does your cup taste like?
| Your cup is… | Most likely cause | Try first |
|---|---|---|
| Sour, sharp or thin | Grind too coarse, water too cool, or the brew ran too fast | Grind a little finer |
| Bitter, dry or harsh | Grind too fine, water too hot, or the brew ran too slow | Grind a little coarser |
| Weak or watery | Too little coffee, or water running around the coffee instead of through it | Weigh or level the dose; pour onto the coffee, not the paper |
| Flat or dull | Stale coffee, or a cold dripper and mug | Fresher beans; preheat the dripper and mug |
| Different every day | Guessing the coffee or water amount | Measure the same way every morning |
More detail for the two most common problems: why pour-over tastes bitter and weak or watery pour-over.
The 10 most common mistakes
1. Guessing the amount of coffee
A heaped scoop can hold almost twice as much as a level one, so "about a scoop" changes every morning. Fix: start at about 15 g of coffee for 240 g (8 oz) of water, a 1:16 ratio. Use our pour-over ratio chart, or the table of how much coffee per cup by mug size. No scale? Use level tablespoons, about 2½–3 per 8 oz mug; see pour-over without a scale.
2. The wrong grind size
Grind controls how fast water runs through the coffee. Too fine and it clogs and tastes bitter; too coarse and it rushes through and tastes sour. Fix: aim for medium, about like coarse sand, then adjust one small step at a time. Our pour-over grind size guide shows what it should look like.
3. Skipping the bloom
Fresh coffee holds gas. If you pour all the water at once, the gas pushes water away from the grounds and the cup comes out uneven. Fix: pour about twice the coffee's weight in water (30 g for 15 g of coffee), wait 30–45 seconds, then continue. More in our guide to the pour-over bloom.
4. Water that is too hot or too cool
Water well below boiling pulls out too little flavor; water at a hard boil on a dark roast can taste harsh. Fix: boil, then wait about 30 seconds, which lands around 195–205°F (90–96°C). See pour-over water temperature for adjustments by roast.
5. Not rinsing the filter or preheating
A dry paper filter can add a papery taste, and a cold ceramic dripper or mug pulls heat out of the brew. Fix: pour hot water through the empty filter until the dripper feels warm, then pour that water out. This matters most with ceramic; our guide to using a ceramic pour-over dripper walks through it.
6. Pouring too fast, or onto the paper
Dumping all the water at once floods the cone, and water running down the paper wall skips the coffee bed. Fix: pour slowly in small circles from the center outward, in two or three stages, keeping the stream off the very edge of the filter. Any kettle works if you pour gently.
7. A filter that does not fit
Too big and the paper folds over and slows the drain; too small and it collapses or lets water run around the coffee. Fix: match the filter shape and size to your dripper, and do a quick fit test with the first one. See cone coffee filter sizes explained.
8. Stale or badly stored coffee
Coffee loses flavor once the bag is open, and pre-ground coffee goes flat faster than whole beans. Fix: keep coffee sealed, away from heat and sun, and try to finish a bag within a few weeks of opening. A scoop with a bag clip keeps the bag closed between brews, and our hand grinder set comes with a sealed jar, so you can grind just before brewing.
9. A dripper and server that are not really clean
Coffee oils build up on glass and ceramic and can make a fresh cup taste stale. Fix: rinse the dripper and server with warm water right after brewing, and give them a gentle wash with a soft sponge now and then. Hand wash is the safe choice for glass and glazed ceramic. Step by step, with baking soda and vinegar for stains: how to clean a pour-over dripper and glass server.
10. Changing everything at once
If you change the grind, the dose and the water on the same morning, you will not know which one helped. Fix: change one thing per brew and write it down. Two or three mornings is usually enough to find your cup.
Two bonus mistakes
- Pouring hot coffee over ice in a glass server. Sudden temperature changes are hard on glass. Brew hot into an empty server, then pour it over a glass of ice. Our iced pour-over recipe has the amounts.
- A dripper that wobbles. A leaning dripper sends water down one side and makes the cup uneven. If yours tips on your mug, see do you need a pour-over stand.
A 5-point checklist for tomorrow
- Measure the coffee the same way: about 15 g (or 2½–3 level tablespoons) per 8 oz mug.
- Grind medium, like coarse sand.
- Boil, then wait about 30 seconds.
- Rinse the filter, bloom for 30–45 seconds, then pour slowly in stages.
- Time it: one mug should finish in roughly 2½–3½ minutes.
The biggest single step toward the same good cup every morning is measuring. Our pocket coffee scale weighs the coffee dose up to 300 g, which takes the guesswork out of mistake number one.
Common questions
Why does my pour-over taste sour?
Usually the grind is too coarse or the water is too cool, so too little flavor comes out. Grind a little finer first.
How long should a pour-over take?
About 2½–3½ minutes for one mug and 3½–4½ minutes for two, counted from the first pour.
Is it the coffee or my method?
Brew the same coffee twice with careful measurements. If it still tastes off, try a different bag. If it improves, it was the method.
Fix one thing tomorrow
Find your cup in the chart, pick the one fix that matches, and change only that. Brewing for two? Our guide to pour-over coffee for two adjusts the method for a bigger batch.
Let it drip.
— Tran Vu Doan, Phin & Clay