Coffee Troubleshooter
Use the Montana Coffee Company Coffee Troubleshooter to diagnose what’s wrong with your coffee, identify the most likely cause, and see which brewing variable to change first.
What does your coffee taste like?
Choose the option that best describes the problem in your cup.
How are you brewing it?
Your brew method changes which variables matter most.
Want a more precise diagnosis?
These details are optional. Add only what you know.
Most likely causes
What to change
What your settings suggest
Keep dialing in your brew
Common Coffee Problems
The same unpleasant flavor can come from different causes depending on the brewing method. Use these as starting points, then let the troubleshooter narrow the diagnosis for your actual brew.
Why Does My Coffee Taste Bitter?
Bitterness often points to over-extraction. A grind that is too fine, excessive brew time, aggressive agitation, or very hot water can pull too much from the coffee.
Why Does My Coffee Taste Sour?
Sour or sharply tart coffee often suggests under-extraction. A coarse grind, short brew time, cool water, or uneven saturation can leave the cup sharp and undeveloped.
Why Does My Coffee Taste Weak?
Weak coffee can come from using too little coffee for the amount of water, but it can also happen when the coffee is under-extracted and never develops enough flavor.
Why Does My Coffee Taste Watery?
A watery cup usually lacks concentration or extraction. Too much water, too little coffee, a coarse grind, fast flow, or short contact time can all contribute.
Why Does My Coffee Taste Too Strong?
Coffee that tastes overly concentrated may simply have too much coffee for the amount of water. Strength and bitterness are different problems, so separate the two.
Why Does My Coffee Taste Dry or Astringent?
A dry, puckering finish can come from uneven or excessive extraction, a grind that is too fine, or aggressive agitation—even when the cup is not especially bitter.
Why Is My Coffee Muddy or Sludgy?
Muddy coffee is often caused by excess fines, a grind that is too fine for the brewer, or filtration that allows more sediment into the cup.
Why Does My Coffee Taste Flat or Dull?
Flat coffee can result from stale coffee, poor water quality, an incorrect brew temperature, or a recipe that is far from balanced.
Troubleshooting by Brew Method
Your brewing method changes what a useful fix looks like. Compare your current recipe with the matching MCC brew guide or calculator when you need a dependable baseline.
French Press
French press problems often trace back to grind size, steep time, coffee-to-water ratio, or how aggressively the coffee is stirred and pressed.
Read French Press Guide →Pour Over
Pour-over extraction is especially sensitive to grind size, flow rate, pouring technique, water temperature, and total brew time.
Read Pour Over Guide →Espresso
Espresso changes quickly when dose, grind size, yield, distribution, or shot time moves even a little. Small adjustments can make a large difference.
Read Espresso Guide →Drip Coffee
Drip coffee can taste off when the ratio, grind size, basket depth, water delivery, or brew time does not match the amount being brewed.
Use Coffee Calculator →AeroPress
AeroPress recipes vary widely, so ratio, grind, brew time, agitation, and dilution should be evaluated together before making a correction.
Use Coffee Calculator →Cold Brew
Cold brew balance depends heavily on ratio, grind size, steep time, filtration, and whether the finished concentrate is diluted before drinking.
Read Cold Brew Guide →Dial In Your Coffee Ratio
If your coffee tastes too weak, too strong, or simply out of balance, confirm the amount of coffee and water you are using before changing other variables.