Pepsi contains approximately 38 mg of caffeine in a standard 12 fl oz (355 ml) can, which translates to about 3.17 mg of caffeine per fluid ounce or roughly 10.7 mg per 100 ml

. For a typical 330 ml can, this amounts to about 35.3 mg of caffeine

. In comparison, Pepsi One has slightly higher caffeine content at about 55.5 mg per 12-ounce serving

. Pepsi Max (also known as Pepsi Zero Sugar in some markets) contains more caffeine than regular Pepsi, with about 42.6 mg per 330 ml can

. To summarize:

• Regular Pepsi (12 fl oz / 355 ml): ~38 mg caffeine
• Regular Pepsi (330 ml can): ~35.3 mg caffeine
• Pepsi One (12 fl oz): ~55.5 mg caffeine
• Pepsi Max / Pepsi Zero Sugar (330 ml): ~42.6 mg caffeine

These values place Pepsi's caffeine content in the lower to moderate range compared to other caffeinated soft drinks and coffee beverages