A standard 12-ounce (355 ml) can of regular Coca-Cola contains about 34 mg of caffeine

. This amount is modest compared to other caffeinated beverages like coffee, which can have around 95 mg per 8-ounce cup

. Diet Coke contains more caffeine than regular Coke, with about 42-46 mg per 12-ounce can, roughly 33% more caffeine

. Other Coca-Cola variants like Coke Zero have caffeine content similar to regular Coke, around 34 mg per 12 oz

. For comparison, Coca-Cola With Coffee has significantly more caffeine, about 69 mg per 12-ounce can

, and Coca-Cola Energy drinks contain about 114 mg per 12-ounce can, much higher than regular Coke but comparable to many energy drinks

. In summary:

• Regular Coke (12 oz): ~34 mg caffeine
• Diet Coke (12 oz): ~42-46 mg caffeine
• Coke Zero (12 oz): ~34 mg caffeine
• Coca-Cola With Coffee (12 oz): ~69 mg caffeine
• Coca-Cola Energy (12 oz): ~114 mg caffeine

Regular Coke's caffeine content is about three to four times less than a typical cup of coffee