Caffeine in Rockstar
A 473 ml can of Rockstar holds about 151 mg of caffeine, close to a Monster and nearly two mugs of coffee.
| Caffeine per serving | 151 mg |
| Serving | 16 oz can (473 ml) |
| Caffeine per 100 ml | 32 mg |
| Share of the 400 mg daily limit | 38% |
| Equal to filter coffee | 1.6 mugs |
| Equal to espresso | 2.4 shots |
| Time to fall below 40 mg | 11 hours |
How long does it last?
How late can you have it?
For an average metabolism this drops below the 40 mg sleep threshold about 11 hours after you drink it, so the latest you could have one and still be clear by an 11 pm bedtime is 11:53 am. A fast metaboliser gains roughly two hours, a slow one loses two.
What to know
The 473 ml can is the American 16 oz size. At about 32 mg per 100 ml it matches Red Bull and Monster in concentration, and the can size does the rest.
Rockstar's line includes Punched and Xdurance variants that run higher, up to 240 mg a can. Check the label rather than assuming.
151 mg needs about ten and a half hours to clear the sleep threshold at an average metabolism.
Compared with the rest of the energy drinks
| Drink | Serving | Caffeine |
|---|---|---|
| Celsius | 12 oz can (355 ml) | 199 mg |
| Alani Nu | 12 oz can (355 ml) | 199 mg |
| Monster | 16.9 oz can (500 ml) | 160 mg |
| Rockstar | 16 oz can (473 ml) | 151 mg |
| Red Bull | 8.4 oz can (250 ml) | 80 mg |
Common questions
How much caffeine is in Rockstar?
Rockstar has about 151 mg of caffeine per 16 oz can (473 ml). That is 38% of the 400 mg daily limit for a healthy adult, or about 1.6 mugs of filter coffee.
How long does the caffeine in Rockstar last?
It peaks about 45 minutes after you drink it and halves every 5.7 hours. For an average adult one 16 oz can takes about 11 hours to fall below 40 mg, the line Cira uses as low enough to sleep on.
How late can I drink Rockstar and still sleep?
For an 11 pm bedtime the latest is about 11:53 am. Move it by the same amount as your own bedtime. People who clear caffeine slowly should stop about two hours earlier.
How many servings of Rockstar can I have in a day?
About 2, going by the 400 mg daily limit for healthy adults. That limit covers everything else with caffeine in it too, so the real number is lower on a day with other coffee, tea or cola.
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Where these numbers come from
Caffeine content is the typical value for the serving shown, the same figure the Cira app uses. Brands and brew methods vary, so treat it as a good estimate rather than a measurement of your cup. The 5.7 hour half-life is a typical value for healthy adults, the 40 mg sleep line is a working threshold of the model, and the 400 mg daily limit is the figure used by the European Food Safety Authority and the US FDA. How the numbers are worked out.
