Understanding the caffeine content of Starbucks' ready-to-drink (RTD) products, especially those labeled "doubleshot," can be confusing. The term does not directly correspond to a standardized measurement like it would in a coffee shop. Instead, the amount of caffeine depends on whether you grab a compact Doubleshot Espresso can or the larger Doubleshot Energy can from the grocery aisle. The caffeine sources and other added ingredients also differ between these popular beverages, influencing their stimulant effect.
The Espresso & Cream Doubleshot: 120mg of Caffeine
The most common product people think of as a "double shot Starbucks can" is the 6.5 fl oz Doubleshot Espresso + Cream. This classic ready-to-drink beverage, often sold in multipacks, is designed for convenience and a quick coffee fix. Despite the "doubleshot" name, its 120mg of caffeine is derived from a blend of brewed espresso coffee and other flavorings, not necessarily a true espresso doppio.
- Flavor Profiles: Comes in classic Espresso + Cream, along with Light and other variations.
- Ingredients: Typically includes brewed espresso coffee, reduced-fat milk, and sugar.
- Target Audience: For those seeking a bold, coffee-forward flavor with moderate caffeine in a small, concentrated format.
The Doubleshot Energy: 135mg of Caffeine
For a stronger boost, the 15 fl oz Doubleshot Energy can is the product to reach for. This beverage is not just coffee; it's a fortified energy drink with a blend of ingredients to enhance its stimulant properties. The caffeine content here is higher, at approximately 135mg per can.
- Added Components: Contains additional energizing ingredients like guarana, ginseng, and B vitamins.
- Higher Volume: The larger 15 fl oz size means the caffeine is delivered in a greater liquid volume compared to the Espresso can.
- Energy-Focused: Marketed as an energy drink, this version is for consumers who want a more significant and broader-spectrum energy lift.
What about a true double shot of espresso from a cafe?
It's important to contrast these ready-to-drink cans with a genuine double shot of espresso (or "doppio") made fresh at a Starbucks store. A standard double espresso shot contains around 150mg of caffeine in a very concentrated 1.5-2 fl oz serving. This is the highest concentration of caffeine among the doubleshot options and delivers a more immediate and intense effect. The ready-to-drink cans provide a gentler, more prolonged boost due to their volume and mixture with milk and other ingredients.
Comparing Caffeine Content: Cans vs. Cafe
| Feature | Doubleshot Espresso (6.5 fl oz can) | Doubleshot Energy (15 fl oz can) | In-Store Double Espresso (1.5–2 fl oz) |
|---|---|---|---|
| Caffeine | ~120mg | ~135mg | ~150mg |
| Serving Size | 6.5 fl oz | 15 fl oz | ~2 fl oz |
| Caffeine Source | Brewed espresso coffee | Brewed coffee, guarana, ginseng | Freshly pulled espresso shots |
| Other Ingredients | Milk, sugar, cream | B vitamins, guarana, ginseng | Water, espresso |
| Energy Boost | Moderate, coffee-focused | Higher, with added energy components | Intense and immediate |
The Role of Ingredients and Manufacturing
The disparity in caffeine levels between the doubleshot products is a result of their distinct formulations. The Doubleshot Espresso can is a premade coffee beverage designed for taste and portability, where the caffeine is a natural component of the coffee extract. In contrast, the Doubleshot Energy can is engineered for maximum energy, blending the coffee's caffeine with other stimulants like guarana and ginseng to create a more potent effect. The manufacturing process and the inclusion of these extra ingredients, along with the larger serving size, account for its higher total caffeine count. A useful comparison for ready-to-drink coffees can be found on this reference chart.
Conclusion
When you see a "doubleshot" label on a Starbucks can, remember that it refers to a product line rather than a specific measure of caffeine equivalent to two cafe espresso shots. The 6.5 oz Doubleshot Espresso + Cream contains approximately 120mg of caffeine, while the larger 15 oz Doubleshot Energy has around 135mg. Both are different from the approximately 150mg found in a fresh, concentrated double espresso shot from a Starbucks counter. The best choice depends on whether you prioritize a quick coffee taste or a more enhanced, long-lasting energy boost from a fortified drink.
