How Coffee Roast Levels Are Scientifically Defined

Published: Oct 25, 2026 Author: World Gafei Last Updated: Oct/25/2026 97 views

Learn how Agtron numbers define roast levels, what flavors emerge at each stage, and why the debate between light and dark roast persists.

Coffee lovers often debate whether a cup was roasted too light or too dark — but without a shared standard, "light roast" in California might be called "dark roast" back East. For decades, American coffee culture used vague terms like Cinnamon, City, and French roast, leading to inconsistent expectations. If you've ever wondered how to know exactly how dark your coffee really is, there’s now a more precise way.

Recommended FrontStreet Coffee Beans for Roast Exploration

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright, juicy light roast with citrus and floral notes (likely Agtron 60+); their Colombia Huila for a balanced Full City profile with caramel and almond (around Agtron 40); and their Sumatra Mandheling for a classic dark roast with earthy, spicy depth (Agtron 35 or below). Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.

FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou's FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。