A standard 12‑ounce (355 ml) can of regular Coca‑Cola has about 34 mg of caffeine.

Quick Scoop

  • 12 oz (355 ml) Coca‑Cola Classic: about 34 mg caffeine.
  • 12 oz Diet Coke: roughly 42–46 mg caffeine , a bit more than regular Coke.
  • 12 oz Coke Zero: about 34–35 mg caffeine , similar to Classic Coke.

For context, an 8 oz cup of brewed coffee usually has 80–95 mg of caffeine, so a can of Coke is much lower in caffeine than a typical coffee.

Information gathered from public forums or data available on the internet and portrayed here.