Why Does My Coffee Taste Bitter?

Bitter coffee is almost always fixable, and it's rarely the beans' fault. Bitterness means the coffee has been over-extracted: the water has pulled too much out of the grounds. So most of the fixes are about easing off a little. Work down this list in order, and change one thing at a time so you know what worked.

1. Your grind is too fine

This is the most common cause. A finer grind gives the water more surface to work on and slows it down, and both push extraction too far. If your brew is also running slower than it should, start here.

2. The water is too hot

Water straight off a rolling boil pulls out more bitterness. Let the kettle sit for 20–30 seconds before you pour. Our guide to water temperature has the details.

3. You're using too much coffee

A very strong ratio concentrates everything in the cup, bitter parts included. If you aren't weighing your coffee yet, start. Our coffee-to-water ratio guide has reliable starting points for each method.

4. It's brewing for too long

Every method has a time window. Go past it and the water keeps pulling out harsh flavours. That includes a pot of coffee left on a hotplate, which carries on cooking long after the brew is done.

5. Your equipment needs a clean

Coffee oils build up in cafetières, filter baskets, grinders and machines, and they go rancid. The kit can look clean and still make every cup taste bitter. Clean it regularly, and descale your machine if you're in a hard water area.

6. The beans are stale

Old beans can taste bitter as well as flat, because the delicate flavours fade first and leave the bitterness exposed. Check the roast date. With us you always get freshly roasted coffee from our certified B Corp speciality roasting partner, and we dispatch your order within one to two working days. You can read how to keep beans fresh in our storage guide.

7. It's a dark roast

Darker roasts are naturally more bitter, because of what happens during roasting. If you've sorted everything above and it still bothers you, try a medium roast. That's a matter of taste, not a mistake in your brewing.

Bitter isn't the same as strong

People mix these up. Strength is how concentrated the coffee is. Bitterness comes from over-extraction. A strong cup can taste smooth, and a weak one can taste awful. Simply using less coffee won't cure bitterness if the real cause is your grind or your water.

If you'd like a smoother cup

Our House Roast (hazelnut, mango and milk chocolate) and Peruvian (plum, chocolate and honey) are the two we'd suggest. Our guide to choosing an Amici coffee covers the rest of the range.

Quick questions

Can old beans cause bitterness? Yes. As beans age, the delicate flavours fade first and the bitterness stands out more.

Should I change several things at once? No. Change one thing, taste, then change the next.

Do dirty machines really matter? Yes, more than most people expect.

Fresher beans make this easier to fix, and a coffee subscription keeps them coming at the pace you drink them.