Red Bull vs Red Bull: caffeine compared
Red Bull (12 oz) has 114 mg of caffeine, 34 mg more than Red Bull (8.4 oz, 80 mg) — 1.4× as much per serving. Per fluid ounce they are about the same: 9.5 mg/oz versus 9.5 mg/oz.
| Red Bull | Red Bull | |
|---|---|---|
| Serving | 8.4 oz | 12 oz |
| Caffeine per serving | 80 mg | 114 mg |
| Per fl oz | 9.5 mg | 9.5 mg |
| Share of 400 mg/day | 20% | 28% |
| Servings to reach 400 mg | 5.0 | 3.5 |
| Hours until under 50 mg | 3.4 h | 5.9 h |
| Last one for an 11 PM bedtime · standard (50 mg) | 7:37 PM | 5:03 PM |
| Last one for an 11 PM bedtime · sensitive (25 mg) | 2:37 PM | 12:03 PM |
| Share of the 200 mg pregnancy limit | 40% | 57% |
One serving of each, over 16 hours
Common questions
Which has more caffeine, Red Bull or Red Bull?
Red Bull (12 oz) has about 114 mg versus 80 mg in Red Bull (8.4 oz): 34 mg more, or 1.4× as much.
Which is stronger per ounce, Red Bull or Red Bull?
About the same: 9.5 mg per fl oz for Red Bull and 9.5 mg for Red Bull. The difference per can or cup comes from serving size.
How many Red Bull servings equal one Red Bull?
About 1.4 servings of Red Bull (8.4 oz) match the caffeine in one Red Bull (12 oz).
When should I stop drinking Red Bull or Red Bull before bed?
For an 11 PM bedtime with a 50 mg limit and a 5-hour half-life: last Red Bull by 7:37 PM, last Red Bull by 5:03 PM. Half-life varies from about 1.5 to 9.5 hours between people.
Method
Caffeine per labeled serving, from the same drink table every calculator here uses (FDA/USDA reference amounts and manufacturer labels; see caffeine content of every drink). Brewed drinks vary batch to batch, so read these as typical values. Decay uses a 5-hour average half-life with a 45-minute absorption ramp; cutoff = bedtime − 5 h × log₂(dose ÷ limit). Percentages use the FDA's 400 mg/day figure for healthy adults and the 200 mg/day limit ACOG gives for pregnancy.
Source — Red Bull: Red Bull — caffeine per can, checked 2026-10-13.
Source — Red Bull: Red Bull — caffeine per can, checked 2026-10-13.