Red Bull Sugarfree contains 80 mg of caffeine per 8.4 oz can (250 ml / 8.5 oz). That is about 84% of the caffeine in a typical 8 oz cup of brewed coffee (about 95 mg). Concentration: 32 mg per 100 ml.
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Red Bull Sugarfree Caffeine Content by Serving
| Serving | Volume | Caffeine | Per 100 ml | Level |
|---|---|---|---|---|
| 8.4 oz can | 250 ml / 8.5 oz | 80 mg | 32 mg | Moderate |
Source: caffeine figures from Caffeine Informer, accessed 2026-06-11. Values can vary by batch, location, and preparation; check the label or the source for the latest figures.
How Red Bull Sugarfree Compares to Coffee
At 80 mg per 8.4 oz can, Red Bull Sugarfree delivers about 84% of the caffeine in a typical 8 oz cup of brewed coffee (about 95 mg). For a wider comparison across drinks, try the caffeine comparison tool or browse the full caffeine database.
When to Stop Drinking Red Bull Sugarfree Before Bed
With caffeine's median 5-hour half-life, an 8.4 oz can of Red Bull Sugarfree (80 mg) needs about 3 h 24 min to fall under 50 mg, the level where most people can fall asleep normally. That puts the last call at 6:30 PM (18:30) for a 10 PM bedtime and 7:30 PM (19:30) for an 11 PM bedtime. Individual half-lives range from roughly 2 to 12 hours, so treat these as a starting point.
The Red Bull Sugarfree sleep cutoff page has last-call times for four bedtimes, and the caffeine half-life calculator personalizes the curve to your metabolism.
