Common questions
The things people actually ask. Short answer first, then the why.
Beginner
- Why is my coffee sour? Sour usually means under-extraction: you did not pull enough out of the grounds. Grind finer, use hotter water, or brew longer.
- What is the best beginner pour-over setup? A simple dripper (a V60 or a flat-bottom like a Kalita Wave), paper filters, a scale with a timer, a burr grinder, and a kettle. The grinder matters most, so spend there first.
- Can I reuse coffee grounds? Not for a good second cup. The flavor is mostly spent, so a re-brew comes out weak and bitter. Used grounds are genuinely useful for compost, the garden, and around the house.
- Does light roast have more caffeine? Almost the same. By weight, dark roast actually has a hair more caffeine; by scoop, denser light-roast beans can give noticeably more. Either way the difference is small, your dose matters far more.
- How should I store ground coffee? Keep it airtight, cool, dark, and dry, and use it quickly. Ground coffee goes stale much faster than whole beans, so buy whole and grind fresh if you can.
- How long do coffee beans stay fresh? Rest beans about 3 to 14 days after the roast date, then drink them within roughly 4 to 6 weeks for whole beans kept sealed. Ground coffee starts fading within minutes, so grind just before you brew.
- How long does brewed coffee last? Brewed coffee tastes best within about 15 to 30 minutes. It stays safe to drink for a few hours at room temperature, but the flavor fades fast and reheating makes it worse. Brew only what you will actually drink.
- How much caffeine is in a cup of coffee? Roughly 60 to 100 mg in a single espresso shot, and about 95 to 200 mg in a mug of filter coffee, depending on dose, beans, and cup size. Robusta carries roughly double the caffeine of arabica.
- How much coffee should I use per cup? About 60 g of coffee per litre of water, roughly a 1:16 ratio, so around 15 g for a 250 ml cup. Weigh it for consistency instead of using scoops.
- How do I make my coffee less bitter? Grind coarser, drop the water temperature a little, shorten the brew, and use fresh beans that are not too darkly roasted. Bitterness is usually over-extraction, so the fix is to pull less out of the grounds.
- How do I read tasting notes on a bag? Tasting notes describe flavors the roaster found in the coffee, not ingredients added to it. "Blueberry, cocoa" means the cup may remind you of those, guiding what to expect.
- Is dark roast stronger than light roast? Not in caffeine. Dark roast tastes bolder and more roasty, but it has slightly less caffeine by weight, not more. The bigger factor is how you measure: a scoop of dark beans weighs less than a scoop of light.
- Is espresso stronger than drip coffee? Per sip, yes: espresso is far more concentrated. But a full mug of drip coffee often has more total caffeine simply because it is much larger. Concentration and total caffeine are two different things.
- What is the difference between a latte, flat white, and cappuccino? All three are espresso plus steamed milk. A cappuccino has the most foam, a latte the most milk, and a flat white is smaller with thin microfoam and a stronger coffee taste.
- Should I freeze my coffee beans? Yes, if you do it right: freeze in airtight, single-dose portions and grind straight from frozen. The harm comes from repeated thawing and refreezing, not from freezing itself.
- Do I really need to weigh my coffee? Yes. A cheap kitchen scale is the fastest, cheapest path to consistent, better-tasting coffee. Scoops vary wildly with grind size and bean, but grams do not lie.
- What does "single origin" mean? It means the coffee comes from one defined place (a country, region, or a single farm) rather than being blended from many. It promises traceability and a sense of place, not automatic quality.
- What grind size should I use? Coarse for cold brew and French press, medium for drip and pour-over, fine for espresso. Match the grind to your brew method first, then fine-tune by taste.
- What is specialty coffee? Specialty coffee is coffee that scores 80 or above on the 100-point SCA scale: high quality, traceable, and free of major defects, usually with distinct flavor.
- What coffee should a beginner start with? A fresh, medium-roast single origin or an approachable blend, bought as whole beans and ground just before brewing. Brazilian and Colombian coffees are forgiving, sweet, and easy to like.
- What is the golden ratio in coffee? It is a rule of thumb of roughly 1 part coffee to 15 to 18 parts water by weight. Start near the middle (about 1:16) and adjust to taste from there.
- What temperature should coffee be served at? Brew hot (around 90 to 96°C) but drink it once it has cooled to roughly 60 to 70°C. Scalding coffee hides its flavor; as it cools, sweetness and aroma come forward.
- Why should I buy whole beans instead of pre-ground? Whole beans keep their aroma for weeks; ground coffee loses it in minutes as more surface meets air. A grinder is the single biggest upgrade you can make.
- Why does my coffee taste burnt or smoky? Usually one of two things: the beans are roasted very dark, or you are over-extracting with water that is too hot. Try a lighter roast, cooler water, and a shorter or coarser brew.
- Why is my coffee bitter? Bitter usually means over-extraction or a very dark, stale roast. Grind a little coarser, use slightly cooler water, brew faster, and check that your beans are fresh.
- Why is my coffee too strong? Too strong means too much coffee for the water. Loosen the ratio (more water per gram of coffee), or just add a splash of hot water to the finished brew. Strength is separate from extraction.
- Why is my coffee weak or watery? Weak coffee usually means too little coffee for the water, or too coarse a grind. Use more coffee (a tighter ratio), grind finer, or brew a little longer.
Intermediate
- What is the best coffee-to-water ratio for V60? Around 1:15 to 1:17 works for most V60 brews, for example 15 g of coffee to 250 g of water. Go tighter for a stronger cup, looser for something lighter and more delicate.
- Blade or burr grinder, does it matter? It matters a lot. Blades chop unevenly into dust and chunks; burrs grind to a uniform size. A burr grinder is the single best upgrade most home brewers can make.
- Do I really need a gooseneck kettle? For pour-over, a gooseneck genuinely helps you pour slowly and exactly where you want. For immersion methods like French press or AeroPress, any kettle is fine.
- Do I need special water for coffee? You do not need to obsess, but very hard, very soft, or chlorinated water hurts the cup. For most people a simple carbon filter is enough to taste noticeably better coffee.
- How hot should my brewing water be? About 92 to 96C (198 to 205F) suits most coffee. Push hotter for light roasts and cooler, around 88 to 92C (190 to 198F), for dark roasts to keep them from turning bitter.
- How do I clean my coffee equipment? Rinse brewers after every use, descale kettles and machines regularly, and deep-clean grinders and espresso gear. Old coffee oils turn rancid and taste stale and bitter, so a clean kit is a real flavour upgrade.
- Is filtered coffee healthier than espresso or French press? Paper filters trap cafestol, an oily compound that can raise LDL cholesterol, so paper-filtered coffee is gentler on that front. The effect is modest for most people, and coffee is broadly healthy either way.
- Is kopi luwak actually worth it? Rarely. It is very expensive, usually tastes mediocre, and most of it now comes from caged civets, which raises serious animal-welfare problems. Spend the money on great specialty coffee instead.
- Is robusta bad? Not inherently. Cheap robusta tastes harsh and rubbery, but well-grown fine robusta can be clean and interesting, and a little adds body and crema to espresso blends.
- What is the difference between washed and natural coffee? Washed coffee has the fruit removed before drying, giving a clean, bright cup. Natural coffee dries inside the whole cherry, giving fruitier, heavier, sometimes funky flavors.
- What is a peaberry? A peaberry is a single round bean that forms when only one seed develops inside a coffee cherry instead of the usual two. It is often sorted and sold separately, though it is not automatically better.
- What does "extraction" mean in coffee? Extraction is how much flavor, and how much of the soluble coffee, the water pulls out of the grounds. Pull too little and it tastes sour and thin; pull too much and it tastes bitter and harsh. The sweet spot is in between.
- Why do I need to bloom coffee? Blooming lets trapped CO2 escape so water can wet the grounds evenly. Skip it and the gas pushes water away, giving you patchy, often sour extraction.
- Why does espresso have crema? Pressure forces CO2 and oils into a fine foam on top of the shot. Fresh beans and robusta produce more crema, so it hints at freshness but is not a verdict on quality.
- Why does my coffee taste different every time? Almost always inconsistent variables: grind, water temperature, dose, or timing drifting from cup to cup. Fix one at a time, weigh everything, and the cup becomes repeatable.
- Why is my AeroPress coffee bitter? Usually the water is too hot, the grind is too fine, or you steeped too long. Try cooler water, a slightly coarser grind, and a shorter, gentler press.
- Why is my cold brew weak? Almost always too little coffee, too coarse a grind, or too short a steep. Use a strong ratio (about 1:8 by weight for concentrate), grind medium-coarse, and steep 12 to 18 hours.
- Why is my French press coffee muddy or gritty? Usually the grind is too fine, or stirring and plunging stir up fines that slip through the metal mesh. Use a coarse grind and try the no-stir method: break the crust, skim, and pour gently.
- Why is specialty coffee more expensive? You are paying for higher quality, careful processing, traceability, and fairer prices to farmers, on top of the lower yields that quality-focused farming tends to produce. You are buying flavor and ethics, not just caffeine.
Advanced
- How fine should I grind for espresso? Very fine, somewhere around powdered sugar or a touch finer, then dialed in by shot time. It is far finer than filter coffee and is your main lever for how fast the shot runs.
- What is a good espresso ratio? A classic modern shot is 1:2, for example 18 g in and 36 g out in about 25 to 32 seconds. Tighten toward 1:1.5 for intensity, loosen toward 1:3 for a lighter, longer shot.
- Why does my espresso have little or no crema? Almost always stale, fully degassed beans, plus a grind that is too coarse, low pressure, or a machine that cannot build proper pressure. Start with fresher beans and a finer grind.
- Why is my espresso pouring too fast or too slow? Grind is the main lever: if the shot runs too fast, grind finer; if it runs too slow, grind coarser. Then check your dose and puck prep for channeling.