In short: “100% arabica” means every bean in the pack comes from Coffea arabica, with no robusta blended in. It describes the species, not the quality: a poorly roasted arabica can taste worse than a good robusta. Arabica carries 1.2 to 1.5% caffeine against robusta's 2.2 to 2.7%, with more acidity and aroma and less heavy bitterness.
| Caffeine in arabica | 1.2 to 1.5% of bean weight |
|---|---|
| Caffeine in robusta | 2.2 to 2.7% of bean weight |
| Arabica share of world production | about 70% |
| Arabica growing altitude | 600 to 2000 metres |
| Speciality cupping score | 80 points or higher (commodity coffee 65 to 75) |
| Robusta share in strong espresso blends | 10 to 30% |
"100% arabica" means only one thing: every bean in the pack comes from Coffea arabica, with no robusta blended in. It is a statement about the species, not about quality, so a cheap, badly roasted arabica can easily taste worse than a good robusta. What the label does tell you is roughly what to expect in the cup: less caffeine (1.2 to 1.5% against robusta's 2.2 to 2.7%), more acidity and aroma, and less of the heavy bitterness and thick crema robusta brings.
ARABICA OR ROBUSTA
To understand what Arabica is, you first need to understand the key differences between the two main types of coffee, Arabica and Robusta.
There are dozens of species of coffee, of which roughly 124 have been identified. The two that dominate commercial production and retailers are Coffea arabica and Coffea canephora (commonly referred to as robusta).
Arabica accounts for about 70% of the world's coffee production and is generally considered to have a better taste. Of course, the exact taste of coffee depends greatly on its origin, processing, method and many other factors. There is no general description of the taste profile of Arabica, depending on the variables. The flavor profile can be chocolatey, spicy, floral, caramel, sour, dry, juicy, fruity, etc.
Robusta evolved about 100,000 years ago, while Arabica is only about 10,000 years old. Therefore, Robusta has had more time to evolve and has become much more adaptable in that time. Robusta can grow in more diverse climates and is naturally more resistant to pests and diseases.


