A standard 250 ml (8.4 fl oz) can of Red Bull contains approximately 80 mg of caffeine, which is roughly equivalent to the amount of caffeine in a cup of home-brewed coffee

. The caffeine content scales with can size:

• 250 ml can: 80 mg caffeine
• 355 ml can: about 110-114 mg caffeine
• 473 ml (16 fl oz) can: about 150-151 mg caffeine
• 591 ml (20 fl oz) can: about 198 mg caffeine

This caffeine level is consistent across original Red Bull and sugar-free versions like Red Bull Zero

. The caffeine concentration is about 31.98 mg per 100 ml. In summary, a 250 ml can of Red Bull contains 80 mg of caffeine. Larger cans contain proportionally more caffeine.