Introduction:Understanding the roast level of coffee beans is the crucial first step to mastering a great cup of coffee. This article provides an in-depth analysis of the eight roast stages from light to dark, explaining the flavor characteristics, Agtron color value ranges, and drop timing for each stage. It helps you determine roast depth based on flavor descriptions and offers practical grind size and water temperature parameters for different roast levels when brewing pour over coffee—even without packaging information—so you can precisely extract the ideal flavors.
The roast level of coffee beans determines the final flavor profile that reaches your palate, ranging from bright and fresh to rich and bold. Each stage has its own unique aromatic expression and extraction characteristics. However, roast level labels commonly found on commercial coffee packaging, such as “light roast,” “medium roast,” or even “cinnamon roast,” often leave beginners struggling to discern the actual differences. By systematically understanding the roast stages, not only can you more accurately select beans that suit your taste preferences, but you can also adjust your brewing strategy according to roast level to achieve optimal flavor expression.
Internationally, there has long been a lack of unified standards for classifying roast levels. Definitions of “light,” “medium,” and “dark” varied widely by region, leading to confusion among consumers and industry professionals. It wasn’t until the Specialty Coffee Association of America (SCAA) collaborated with Agtron to introduce the infrared caramelization analyzer (Agtron) for measuring bean surface color that a widely adopted set of roast level indicators was established. This system, which uses eight color grades, comprehensively covers various roast states from light to dark, and has become an important reference tool for the industry to judge roast depth.
According to the Agtron color value system, we can roughly divide roast levels into eight tiers. Among them,Agtron #95 falls under the extremely light roast (also referred to as light roast). This stage is usually dropped just as the first crack is about to end in a dense phase, preserving the maximum amount of the bean’s original flavors. The acidity is bright, often accompanied by pronounced floral and fruity notes, making it suitable for drinkers who prefer a clean and refreshing taste.Agtron #85 is then the cinnamon roast, where the drop point occurs right after the first crack ends. The flavor shifts toward mildly sweet with a slight spicy sensation, and this is an important stage many professionals use to evaluate a bean’s potential.
Moving intomedium roast,Agtron #75 refers to the common medium roast (Medium Roast), typically dropped after the first crack finishes. At this point, sweetness begins to emerge, and the balance between acidity and bitterness is achieved. It’s well suited for showcasing the bean’s inherent regional characteristics and is recommended for drinkers seeking balanced flavors. If the roast time is extended slightly further to reachAgtron #65 , the high roast (High Roast), it is dropped during the calm period between the first and second cracks. The flavors begin to tighten up, laying the foundation for a richer base.
When enteringthe medium-dark roaststage,Agtron #55 , the city roast (City Roast) is typically dropped just as the second crack begins. Acidity is noticeably reduced, while sweetness and body increase. It suits those who enjoy a richer mouthfeel. Going further down toAgtron #45 , the full city roast (Full City Roast), which is dropped just before the second crack becomes dense, results in a rounder flavor often with nutty and chocolatey notes. It is a popular choice for many single-origin beans aiming to express greater depth.
As fordark roast,Agtron #35 , the French roast (French Roast) is dropped during the dense phase of the second crack. The flavor becomes intense with noticeable caramel and carbonized notes, making it suitable for making espresso. The deepest level,Agtron #25 , is the Italian roast (Italian Roast), which is dropped when the bean surface begins to show oil. This stage is mostly used for espresso, featuring a bold, bitter-sweet flavor, but the regional characteristics become less distinct.
If the coffee bag does not indicate the roast level, you can also make an educated guess based on the flavor description. For example, if the packaging emphasizes bright aromas such as citrus, berries, or floral notes, it is likely a medium-light roast, commonly found in African origins like Ethiopia or Kenya. If the focus is on neutral aromas like nuts or malt, it is often a medium roast, such as beans from Colombia or Costa Rica in Central and South America. When the description includes cocoa, deep nuts, or even a hint of smokiness, it is usually a medium-dark or darker roast, such as Indonesian Mandheling or Brazilian beans.
For espresso, due to the high-pressure and high-temperature extraction environment, it is recommended to choose medium-dark to dark roast beans to ensure that the flavor compounds are fully released within the short extraction time. Too light a roast may lead to under-extraction and thin flavors, while too dark a roast can easily produce burnt bitterness and smoky off-notes, affecting overall balance. Many specialty shops prefer medium-dark roasts to achieve the perfect combination of dark chocolate, caramel, and smooth crema.
In pour over practice, different roast levels also require adjustments to grind size and water temperature parameters. For medium-light to medium roast beans, it is recommended to use a medium-fine grind (e.g., around 75%-80% passing rate through a Chinese standard No. 20 sieve), with water temperature controlled at 90–92°C. This helps to highlight bright acidic and sweet layers while maintaining overall body. For medium-dark roast beans, a medium grind (around 65%-70% passing rate) is more suitable, with water temperature slightly lowered to 87–89°C to reduce the risk of over-extraction, resulting in a stable and layered taste profile.
The above content is compiled by CoffeeHunters, a coffee news website.
