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An 8-ounce brewed coffee often has 80–100 mg caffeine; brewed black tea often has 40–60 mg, varying with beans, leaves, and brew.

Most Darjeeling cups land in the 30–60 mg caffeine range for 8 oz, with lighter or longer steeps pushing it lower or higher.

A typical 8-ounce matcha drink lands around 38–89 mg of caffeine, with the exact amount driven by powder dose, grade, and how you mix it.

An 8-oz cup of decaf coffee usually has 2–15 mg of caffeine, but brew strength, bean type, and brand can shift the total.

A 16-oz cold brew often lands around 150–260 mg of caffeine, with coffee dose, steep time, and dilution setting the swing.

A Dunkin cold brew often lands near 260 mg of caffeine for a medium, with cup size, ice, and add-ins shifting the total.

A 12-oz can of regular cola often lands around 34–38 mg of caffeine, and some diet colas run higher.

A typical 8-oz brewed coffee lands near 80–100 mg of caffeine, but brew style and cup size can push it far higher or lower.

A 12-oz brewed coffee often lands near 113–247 mg of caffeine, while a 12-oz cola is often 23–83 mg.

A typical 8-oz brewed coffee has about 95 mg caffeine; many 16-oz energy drinks land near 160 mg.