A 12-ounce (355 ml) can of Coca-Cola contains approximately 33 to 34 mg of caffeine. Diet Coke has a higher caffeine content, with about 42 to 46 mg per 12-ounce can. This means Diet Coke has more caffeine than regular Coke, as the company adds extra caffeine to give Diet Coke a distinct, slightly more bitter flavor

. For comparison, an 8-ounce cup of coffee contains about 95 mg of caffeine, which is nearly three times the caffeine in a 12-ounce Coke

. Other soft drinks generally have caffeine content in a similar range, with Coke being on the lower side among caffeinated beverages

. In summary:

• Regular Coke (12 oz): ~33-34 mg caffeine
• Diet Coke (12 oz): ~42-46 mg caffeine
• Coffee (8 oz): ~95 mg caffeine

This caffeine amount in Coke is relatively low compared to coffee and many energy drinks