Monster Zero Ultra contains 150 mg of caffeine per 16 oz can (473 ml / 16 oz). That is about 1.6 times the caffeine of a typical 8 oz cup of brewed coffee (about 95 mg). Concentration: 31.7 mg per 100 ml.
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Monster Zero Ultra Caffeine Content by Serving
| Serving | Volume | Caffeine | Per 100 ml | Level |
|---|---|---|---|---|
| 16 oz can | 473 ml / 16 oz | 150 mg | 31.7 mg | High |
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 Monster Zero Ultra Compares to Coffee
At 150 mg per 16 oz can, Monster Zero Ultra delivers about 1.6 times the caffeine of 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 Monster Zero Ultra Before Bed
With caffeine's median 5-hour half-life, a 16 oz can of Monster Zero Ultra (150 mg) needs about 7 h 56 min to fall under 50 mg, the level where most people can fall asleep normally. That puts the last call at 2:00 PM (14:00) for a 10 PM bedtime and 3:00 PM (15:00) for an 11 PM bedtime. Individual half-lives range from roughly 2 to 12 hours, so treat these as a starting point.
The Monster Zero Ultra sleep cutoff page has last-call times for four bedtimes, and the caffeine half-life calculator personalizes the curve to your metabolism.
