Coffee beats almost every other common beverage in caffeine content, delivering 107 to 151 mg per 8-ounce cup compared to 28 to 46 mg for the same size cup of black tea. But the full picture is more interesting than that, because serving sizes, brewing methods, and concentration levels can flip the rankings in surprising ways.
Coffee vs. Tea vs. Energy Drinks
A standard 8-ounce cup of brewed coffee contains roughly 107 to 151 mg of caffeine. Black tea in the same serving size lands between 28 and 46 mg, while green tea comes in even lower at around 30 mg per cup. So cup for cup, coffee delivers about three to four times the caffeine of tea.
Energy drinks vary wildly by brand and can land anywhere on the spectrum. An 8.4-ounce can of Red Bull contains 80 mg of caffeine, which is actually less than a cup of drip coffee. A 12-ounce Celsius packs 200 mg. A 16-ounce Bang hits 300 mg, roughly double a standard cup of coffee. Monster Energy Original sits at 160 mg for a 16-ounce can. The key difference is that energy drinks come in larger cans, so even brands with modest caffeine concentrations can deliver a big total dose simply because you’re drinking more liquid.
Espresso vs. Drip Coffee
Espresso is more concentrated than drip coffee, containing about 40 mg of caffeine per ounce compared to roughly 10 mg per ounce for a brewed cup. But a single espresso shot is only about one ounce, so you’re getting around 40 mg total. A 12-ounce mug of drip coffee delivers about 120 mg. That means your regular morning coffee actually has more total caffeine than a shot of espresso, even though espresso is four times stronger by volume. Order a double or triple espresso, though, and the math shifts back in espresso’s favor.
Cold Brew vs. Iced Coffee
Cold brew is steeped in cold water for 12 to 24 hours, which extracts more caffeine than a quick hot brew that’s poured over ice. A 16-ounce cold brew typically contains around 200 mg of caffeine. Standard iced coffee, which is just regular drip coffee cooled down and served over ice, has about 85 mg per 8-ounce serving, or roughly 170 mg in 16 ounces. Cold brew edges out iced coffee at the same serving size, and many cold brew concentrates are even stronger before they’re diluted.
Light Roast vs. Dark Roast
There’s a persistent belief that dark roast coffee has more caffeine because it tastes bolder, or alternatively that light roast has more because roasting “burns off” caffeine. The reality is simpler. When you measure coffee by weight, light and dark roasts have very similar caffeine content. Roasting doesn’t destroy caffeine in any meaningful amount.
The confusion comes from volume measurements. Dark roast beans puff up with air during roasting, so they take up more space. If you scoop coffee by the tablespoon, you’ll fit fewer dark roast beans per scoop, which means slightly less caffeine. If you weigh your coffee, the difference essentially disappears. For most people brewing at home with a scoop, light roast has a tiny edge, but it’s not enough to notice.
Matcha vs. Green Tea
Matcha is made from ground whole tea leaves rather than steeped leaves you remove, so you consume the entire leaf and all its caffeine. One gram of matcha powder contains 19 to 44 mg of caffeine, and a typical serving uses one to two grams. A standard cup of brewed green tea has about 30 mg. Depending on how much powder you use, matcha can deliver roughly the same amount of caffeine as green tea or up to nearly three times as much. A strong matcha preparation can approach the caffeine content of a weak cup of coffee.
Sodas and Chocolate
Soft drinks sit at the low end of the caffeine spectrum. Most colas and similar sodas contain 30 to 55 mg of caffeine per 12-ounce can. That’s less than a single shot of espresso and a fraction of what you’d get from drip coffee.
Chocolate contains caffeine too, though not enough to rival a cup of coffee. Dark chocolate has about 12 mg per ounce, so a typical 1.5-ounce serving would give you around 18 mg. Milk chocolate is lower, with roughly 9 mg per 1.55-ounce bar. White chocolate contains zero caffeine because it’s made from cocoa butter rather than cocoa solids. Chocolate also contains theobromine, a related compound that has a milder, longer-lasting stimulant effect.
Decaf Isn’t Zero Caffeine
Decaf coffee still contains a small amount of caffeine. The decaffeination process removes at least 97% of the caffeine, but a typical 8-ounce cup of decaf retains about 7 mg. That’s negligible for most people, roughly equivalent to a bite of dark chocolate. But if you’re drinking several cups of decaf throughout the day, the total can add up to 20 or 30 mg, which is worth knowing if you’re highly sensitive to caffeine or avoiding it for medical reasons.
How Much Is Safe Per Day
The FDA considers 400 mg of caffeine per day a safe amount for most healthy adults. That works out to roughly two to three 12-ounce cups of brewed coffee, or about five cups of black tea, or two 12-ounce cans of Celsius. A single 16-ounce Bang energy drink gets you to 300 mg, or 75% of that daily guideline, in one sitting. If you’re combining sources throughout the day (morning coffee, afternoon tea, post-lunch chocolate), it helps to have a rough mental tally of where each one lands.