IRN-BRU contains 30 mg of caffeine per 330 ml can (330 ml / 11.2 oz). That is about 32% of the caffeine in a typical 8 oz cup of brewed coffee (about 95 mg). Concentration: 9.1 mg per 100 ml.
Track your caffeine with Unbuzz, free on the App Store.
IRN-BRU Caffeine Content by Serving
Figures are for IRN-BRU (A.G. Barr).
| Serving | Volume | Caffeine | Per 100 ml | Level |
|---|---|---|---|---|
| 330 ml can | 330 ml / 11.2 oz | 30 mg | 9.1 mg | Low |
Source: caffeine figures from IRN-BRU official FAQ, accessed 2026-06-11. Values can vary by batch, location, and preparation; check the label or the source for the latest figures.
How IRN-BRU Compares to Coffee
At 30 mg per 330 ml can, IRN-BRU delivers about 32% 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 IRN-BRU Before Bed
A 330 ml can of IRN-BRU (30 mg) stays under the 50 mg sleep-ready threshold from the first sip, so a normal serving is unlikely to delay sleep on its own. Multiple servings stack, though: caffeine's median half-life is about 5 hours, so a second or third serving in the afternoon can still add up past 50 mg by bedtime.
The IRN-BRU sleep cutoff page has last-call times for four bedtimes, and the caffeine half-life calculator personalizes the curve to your metabolism.
