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Decaf coffee typically contains 2 to 7 mg of caffeine per 8-ounce cup, with some brands and brewing methods reaching up to 15 mg per serving.

A 7.5-ounce mini can of Diet Coke contains about 29 mg of caffeine, based on the 46 mg found in a standard 12-ounce can.

Three standard 8-ounce cups of brewed coffee contain roughly 285 mg of caffeine on average.

A 24-ounce cup of brewed coffee typically contains 285–360 mg of caffeine, which falls within the 400 mg daily limit most healthy adults can tolerate.

A 7.5-oz mini can of Coca-Cola contains 21 mg of caffeine — about one-fifth the caffeine of an 8-oz cup of coffee.

A standard 16-ounce cold brew contains roughly 200 mg of caffeine, but actual amounts vary significantly with brewing ratio and steeping time.

As of 2025, a 20 oz coffee contains 235 to 490 mg of caffeine, depending on the brew method and brand.. As of 2025, a standard drip coffee at this size averages around 240 mg..

Caffeine content in Starbucks coffee ranges from about 75 mg in a short decaf Pike Place to 475 mg in a Venti Blonde Roast brewed coffee.

Mexican Coke contains 34 mg of caffeine per 12 oz glass bottle and 48 mg per 16.9 oz bottle.

As of recent testing, an 8-ounce cup of Folgers Classic Roast Instant Coffee contains about 170 mg of caffeine, though costs vary by year and location..