C4 Energy contains 200 mg of caffeine per 16 oz can (473 ml / 16 oz). That is about 2.1 times the caffeine of a typical 8 oz cup of brewed coffee (about 95 mg). Concentration: 42.3 mg per 100 ml.
Track your caffeine with Unbuzz, free on the App Store.
C4 Energy Caffeine Content by Serving
| Serving | Volume | Caffeine | Per 100 ml | Level |
|---|---|---|---|---|
| 16 oz can | 473 ml / 16 oz | 200 mg | 42.3 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 C4 Energy Compares to Coffee
At 200 mg per 16 oz can, C4 Energy delivers about 2.1 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 C4 Energy Before Bed
With caffeine's median 5-hour half-life, a 16 oz can of C4 Energy (200 mg) needs about 10 h to fall under 50 mg, the level where most people can fall asleep normally. That puts the last call at 12:00 PM (12:00) for a 10 PM bedtime and 1:00 PM (13:00) for an 11 PM bedtime. Individual half-lives range from roughly 2 to 12 hours, so treat these as a starting point.
The C4 Energy sleep cutoff page has last-call times for four bedtimes, and the caffeine half-life calculator personalizes the curve to your metabolism.
