Common Coffee Brewing Mistakes (and How to Avoid Them)

For many Australians, coffee isn’t just a beverage—it’s a ritual. Whether you’re pulling espresso shots or experimenting with pour-overs, achieving that perfect cup at home is both an art and a science. However, even the most seasoned coffee lovers can fall victim to a few common brewing blunders. Let’s explore the most frequent coffee brewing mistakes—and how to avoid them for consistently delicious results.

Using the Wrong Grind Size

Grind size plays a pivotal role in coffee extraction. Too coarse, and your brew may be weak and underwhelming. Too fine, and you risk over-extraction and bitterness. Each brewing method requires a different grind size: French press needs a coarse grind, while espresso calls for a fine one. If you’re making a piccolo coffee, for example—a short milk-based espresso drink—you’ll need a finely ground coffee to ensure a rich, concentrated shot.

Brewing with Stale Beans

Freshness is key to flavour. Coffee beans begin to lose their aromatic compounds shortly after roasting. If you’re brewing with beans that have been sitting in your pantry for months, you’re likely sacrificing depth and complexity. Always check the roast date and try to use beans within 2–4 weeks of roasting for peak flavour.

Using Water That’s Too Hot (or Too Cold)

The optimal water temperature for brewing coffee is between 90–96°C. Water that’s too hot can burn the grounds, leading to bitter flavours, while cooler water may under-extract, resulting in a flat taste. If you don’t have a thermometer, simply let your kettle sit for 30 seconds after boiling before pouring.

Incorrect Coffee-to-Water Ratio

Eyeballing your measurements might work for some recipes, but it’s risky business in coffee brewing. Using too much coffee can lead to an overpowering brew, while too little results in a watery cup. A general rule of thumb is a 1:15 ratio—1 gram of coffee for every 15 grams of water. Invest in a digital scale to take the guesswork out.

Neglecting to Clean Your Equipment

Old coffee oils and residue can build up quickly, tainting your brew with rancid flavours. Whether you’re using a French press, AeroPress, espresso machine, or a simple drip filter, make it a habit to rinse thoroughly after each use and give your equipment a deep clean weekly.

Not Blooming Your Coffee

If you’re using freshly ground coffee in a pour-over or French press, don’t skip the bloom. Pour a small amount of hot water over your grounds and let them sit for 30–45 seconds before continuing. This allows trapped gases to escape, leading to better extraction and a smoother cup.

Improper Storage of Beans

Storing beans in a transparent jar or near heat sources (like a stove) can degrade them quickly. Light, air, moisture, and heat are the enemies of fresh coffee. Always store your beans in an airtight, opaque container in a cool, dry place—never the fridge or freezer.

Ready for the perfect brew?

Perfecting your coffee brewing routine doesn’t require fancy gear or barista training—it’s about being mindful of a few key factors that impact flavour. From mastering grind size to respecting the freshness of your beans, small changes can lead to big improvements. And whether you’re crafting a smooth filter coffee or a velvety piccolo coffee, knowing the fundamentals will elevate your home brewing game every time.