Which Types of Coffee Have the Highest Caffeine Content?

If you’ve ever wondered which coffee packs the biggest punch, you’re not alone. While most of us reach for a cup of joe to jumpstart our day, not all coffees are created equal when it comes to caffeine content. From brewing methods to bean types, several factors influence just how much buzz you’re getting in your cup.

1. The Strongest Brewing Methods

Espresso might seem like the most powerful option—it’s small, dark, and intense—but it’s actually how much you drink that matters. A single shot of espresso (about 1 oz) contains roughly 63 mg of caffeine. Compare that to an 8 oz cup of drip coffee, which can hold anywhere from 90 to 120 mg of caffeine. So ounce-for-ounce, espresso is stronger, but drip coffee delivers more caffeine per cup.

Cold brew, on the other hand, is steeped for 12–24 hours and typically uses more coffee grounds than hot brewing methods. That extended extraction time can result in a caffeine-heavy concentrate, especially if you’re drinking it straight or lightly diluted.

2. The Bean Factor: Robusta vs. Arabica

Not all coffee beans are alike. Robusta beans contain nearly double the caffeine of Arabica beans. While Arabica is known for its smoother, sweeter flavor (and is the bean you'll find at Soul Caffeine), Robusta brings the heat in terms of caffeine and is often used in espresso blends and instant coffee for that extra kick.

In our opinion the juice is not worth the squeeze when it comes to Robusta. If you're okay with something not tasting great in exchange for caffeine there are plenty of energy drinks that will fit the bill. Coffee should taste good.

3. Roast Levels and Caffeine

Contrary to popular belief, lighter roasts generally retain more caffeine than darker roasts. That's because caffeine is somewhat diminished during the roasting process. While dark roasts might taste bolder, lighter roasts often have a higher caffeine concentration by volume.

4. Serving Size Matters

Let’s not forget the size of your drink. A small 8 oz cold brew might give you a solid 200 mg of caffeine, while a large 16 oz cup could push you over 300 mg. The takeaway? The brew type matters, but so does the quantity.

If you want the highest caffeine content, go for a cold brew concentrate, a Robusta-heavy espresso, or a light roast drip coffee in a generous serving size. Whether you're a morning warrior or just need that mid-day energy lift, knowing your coffee can help you find the perfect balance of flavor and fuel.

Need a boost? Swing by Soul Caffeine in Daphne, Spanish Fort, or Mobile and we’ll help you find the right roast to power your day—whether you’re team cold brew, espresso, or classic drip!