What Determines Coffee Concentration? Basic Facts You Should Know

You’re five minutes into your morning, the coffee cup in hand, the warmth just reaching your lips—and suddenly everything else fades. But have you ever wondered why one cup of coffee hits stronger than another, even when you’re using the same beans? The answer isn’t always obvious.

Coffee strength—its concentration—is primarily determined by the brew ratio (grounds to water), water temperature, extraction time, and grind size. Most specialty guidelines suggest a brew ratio between 1:15 and 1:18, water between 91–94°C, and ideal drinking temperatures of 65–75°C.

How Different Brewing Methods Change Coffee Strength

At home, many people still brew coffee using traditional methods. One common approach involves scooping pre-packaged coffee powder into a ceramic cup, adding two sugar cubes, then pouring in very hot water. After stirring, coffee creamer or powdered milk is added. This method delivers a strong, sweet, and creamy cup—but lacks precision. The coffee powder used is typically dark roasted and finely ground, contributing to an intense, heavy-bodied brew.

In contrast, office environments favour speed and convenience. Workers often rip open a packet of instant coffee, pour it into a cup, add hot water, stir, and drink. While fast, this method produces a thin, artificial-tasting coffee with minimal body or aroma. The focus here is efficiency, not quality or strength.

Specialty coffee shops, however, use professional espresso machines or pour-over setups. These methods control grind size, water temperature, pressure, and extraction time precisely. Espresso, for example, is highly concentrated due to fine grind, high pressure, and short extraction (usually around 25–30 seconds). Even milk-based drinks like cappuccino or latte retain a bold coffee flavour underneath layers of foam or steamed milk.