9 sodas, ranked by caffeine per can, taken from each brand's own nutrition data. Soda is the source people most often forget to count, since a can feels like "just a soft drink" next to a coffee.
Diet and regular versions of the same brand don't always match on caffeine. Add your soda to the caffeine calculator alongside everything else you drink to see your real daily total.
Soda, strongest to weakest
| Drink | Serving | Caffeine | Source |
|---|---|---|---|
| Mountain Dew | 12 fl oz (355 ml) | 54 mg | PepsiCo Product FactsSource |
| Diet Mountain Dew | 12 fl oz (355 ml) | 54 mg | PepsiCo Product FactsSource |
| Diet Coke | 12 fl oz (355 ml) | 46 mg | The Coca-Cola Company, ingredients FAQSource |
| Diet cola (generic) | Can, 12 fl oz (355 ml) | 43 mg | USDA FoodData Central, low-calorie cola with aspartame, contains caffeineSource |
| Pepsi Zero Sugar | 12 fl oz (355 ml) | 38 mg | PepsiCo Product FactsSource |
| Pepsi | 12 fl oz (355 ml) | 38 mg | PepsiCo Product FactsSource |
| Diet Pepsi | 12 fl oz (355 ml) | 35 mg | PepsiCo Product Facts (24 fl oz bottle, per 12 fl oz serving)Source |
| Coca-Cola Classic | 12 fl oz (355 ml) | 34 mg | The Coca-Cola Company, ingredients FAQSource |
| Cola (generic) | Can, 12 fl oz (355 ml) | 33 mg | USDA FoodData Central, carbonated cola, regularSource |