Why does my coffee taste bitter?

Bitter coffee almost always means overextraction: the water pulled too much out of the grounds, because the grind was too fine, the water was too hot, or the brew ran too long. Grind one notch coarser first, then brew again with the same dose. If it is still harsh, check that you are using about 60 grams of coffee per liter of water, which is roughly half an ounce for each 8 ounce cup, and that your water is just off the boil rather than still rolling.

What should you change first?

Change one thing per cup. If you change the grind and the water temperature together, you will not know which one fixed it.

Is it the same fix as sour coffee?

It is the opposite one. Sour coffee usually means underextraction, and we cover that in why does my coffee taste sour. If your cup swings between sour and bitter from one morning to the next, your grind or your dose is drifting. Weighing both settles it faster than any other step.

Can old coffee taste bitter?

Stale coffee more often tastes flat or papery than sharply bitter, but the two can arrive together, so it is worth ruling out. Ground coffee ages faster than whole bean, because more surface is exposed to air. Store beans in a sealed container away from heat and grind just before you brew. We do not print a roast date because we roast on demand, and our FAQ explains how that works.

Could your equipment be the problem?

Yes. Coffee oils build up in filters, screens and carafes, and old oil tastes bitter in the next cup. A quick wash with warm soapy water usually clears it. If you brew with a press, see how to clean a French press. Also check the size of your grind against your method, since a grind that suits a drip machine is far too fine for a press.

Is there a coffee that is harder to over-extract?

No coffee is immune, but some are more forgiving. The label for No. 6 Hegemony describes low acidity and heavy body, and says it is very hard to ruin. It is a medium roast from Parana and Sao Paulo, Brazil, with cocoa and smooth notes. If you keep landing on bitter cups and want a forgiving one while you dial in your grind, that is where we would start. See who No. 6 Hegemony is for, and who should skip it for the honest version.

Does the brew method change the answer?

The cause is the same for every method, but the dial you turn is different. In a drip machine, the grind is usually the only setting you control, so it is the first thing to change. In a French press, the steep time matters most, so try four minutes before you touch anything else, and pour the coffee out of the press when the time is up instead of leaving it sitting on the grounds. In a pour-over, your pouring speed also counts. Very slow, repeated pours keep the water in contact with the grounds for longer and can push the cup toward bitter.

Espresso and moka pot drinkers can use the same logic. If the shot or the pot runs slowly and tastes harsh, the grind is too fine for that machine. Loosen it a little and watch the flow.

A five step reset

1. Weigh your coffee and your water, aiming for about 60 g of coffee per liter.
2. Use water just off the boil, not a full rolling boil.
3. Grind one notch coarser than your last bitter cup.
4. Rinse the filter and wash the parts that touch the coffee.
5. Brew once, taste, and only then change the next setting.

For a starting recipe by method, see the drip coffee maker pick and all ten coffees if you want to try a different profile. The subscription is 11% off and you can skip or cancel in one click.

Go coarser, weigh your dose, and taste again before you touch anything else.