Coffee Tasting Too Bitter? Try These 5 Simple Fixes First
If your morning coffee has been tasting a little too bitter lately, your beans might not actually be the problem.
The way you grind, measure and brew your coffee can have a surprisingly big impact on what ends up in your cup. Even something as simple as water temperature or a machine that needs cleaning can change the way your coffee tastes.
So before you give up on your current beans, try these five simple fixes.
1. Try a Coarser Grind
If your coffee is ground too finely for your brewing method, the water can extract too much from the grounds. This is known as over-extraction, and it can leave your coffee tasting bitter, harsh or dry.
What to try
Move your grinder slightly coarser and brew another cup.
Don't make a huge adjustment immediately. Change the grind one step at a time, taste the result and continue adjusting until you find the sweet spot.
Tip: If you're troubleshooting your coffee, change only one thing at a time. Otherwise, you won't know which adjustment actually made your coffee taste better.
2. Check Your Water Temperature
We need hot water to brew coffee, but that doesn't mean the hottest possible water will always produce the best cup.
Water temperature affects extraction, and excessively hot water can make harsh or bitter flavours more noticeable.
What to try
For many brewing methods, 90–96°C is a useful starting range.
If you're using a regular kettle without temperature controls, let freshly boiled water sit briefly before pouring.
From there, experiment. If your coffee still tastes too bitter, try reducing the temperature slightly and see whether you prefer the result.
3. Don't Brew for Too Long
Brew time is another variable that can change the flavour of your coffee.
As water remains in contact with the grounds, it continues extracting compounds from the coffee. Leave it for too long and you may end up with an over-extracted cup that tastes unpleasantly bitter.
What to try
Shorten your brewing time slightly.
Using a timer can also help you recreate a good cup once you've found a brew time you like.
Keep everything else the same while you're experimenting. If you simultaneously change your grind, temperature and brew time, it becomes much harder to figure out what was causing the bitterness.
4. Stop Guessing Your Coffee-to-Water Ratio
If one cup tastes great and the next doesn't, your measurements could be part of the problem.
A digital scale might seem like something only serious coffee enthusiasts need, but it's one of the easiest ways to make home brewing more consistent.
What to try
Measure both your coffee and water instead of relying on scoops or guessing by eye.
For filter coffee, a ratio of around 1:15 to 1:17 is a good place to start.
For example:
15g coffee + 225–255g water
Treat this as a starting point rather than a strict rule. Different brewing methods require different ratios, and ultimately your preferred cup is the one that tastes good to you.
5. Give Your Coffee Equipment a Clean
You've adjusted your grind. You've checked the temperature. You've measured everything carefully.
But when was the last time you cleaned your coffee equipment?
Coffee oils and residue can accumulate on brewing equipment over time. Those old residues can introduce stale, unpleasant and bitter flavours into your next cup.
What to try
Rinse removable brewing components regularly and clean your grinder and coffee machine according to the manufacturer's instructions.
Pay attention to areas that come into frequent contact with coffee, such as the portafilter, group head, grinder and other brewing components.
Sometimes, the easiest way to improve your coffee isn't changing the recipe at all — it's giving everything a good clean.
Still Bitter? Change One Thing at a Time
The next time your coffee tastes too bitter, don't immediately change your beans.
Work through the basics:
Grind size → Water temperature → Brew time → Coffee-to-water ratio → Equipment cleanliness
Make one adjustment, brew another cup and taste the difference.
Coffee doesn't have to be complicated. A little experimentation can help you understand what you enjoy and make it much easier to recreate that cup the next morning.
And if you've tried all five? Then maybe it is time to open a different bag of beans.
Better coffee starts with the little things. Save these tips for your next brew.