Roasting transforms green coffee beans into the aromatic, flavorful beans you brew. Understanding roast levels helps you choose beans that match your taste preferences.
What Happens During Roasting?
Green beans contain sugars, acids, proteins, and lipids. During roasting, heat triggers the Maillard reaction — the same process that browns bread and sears meat. Sugars caramelize, acids evolve, oils develop, and hundreds of new flavor compounds form.
Light Roast
Temperature: 180–205°C (first crack)
Color: Light brown, no oil on surface
Flavor: High acidity, floral, fruity, tea-like, complex
Body: Light
Caffeine: Highest (less caffeine is burned off)
Light roasts preserve origin character. They highlight what the terroir and variety contribute — geography, soil, processing. Popular for single-origin pour overs.
Medium Roast
Temperature: 210–220°C
Color: Medium brown, minimal oil
Flavor: Balanced acidity and sweetness, caramel, chocolate, nuts
Body: Medium
Medium roast is the most popular. It balances origin character with roast-developed sweetness. Great for drip coffee, espresso, and versatile brewing.
Dark Roast
Temperature: 225–245°C (second crack)
Color: Dark brown to black, oily surface
Flavor: Low acidity, bold, smoky, bitter, roasty
Body: Heavy
Caffeine: Lowest
Dark roasts overpower origin flavors — you're tasting the roast more than the bean. Preferred for espresso blends and those who like bold, traditional coffee.
The Myth of Dark = Strong
Dark roast coffee actually has slightly less caffeine by weight. "Strong" usually refers to body and bitterness, not caffeine content.
Choose your roast based on what flavors you enjoy, not assumptions about strength.
