Kill Cliff Ignite has more caffeine than Red Bull on both counts: 150mg per 12 oz can against 80mg per 8.4 oz can, and about 12mg per fluid ounce against 10. The serving sizes differ, so the table below shows both ways of counting.
Kill Cliff Ignite vs Red Bull: the numbers
| Kill Cliff Ignite | Red Bull | |
|---|---|---|
| Caffeine per serving | 150mg per 12 oz can | 80mg per 8.4 oz can |
| Caffeine per fl oz | 12.5mg | 9.5mg |
| Servings to reach 400mg (FDA context) | 2.7 | 5.0 |
Sources: Kill Cliff Ignite's figure is verified in our Kill Cliff Ignite caffeine guide against Caffeine Informer (source); Red Bull's figure is verified in our Red Bull guide against Red Bull label / Caffeine Informer (source).
Which one should you pick?
Pick Red Bull when you want the lighter dose or a slower ramp, and Kill Cliff Ignite when you actually need the bigger hit and know your tolerance. If you are stacking either with other caffeinated drinks through the day, run the math against the 400mg reference rather than guessing.
For context, the FDA cites 400mg of caffeine a day as an amount generally not associated with negative effects in healthy adults. Tolerance and health vary, so treat these numbers as information, not advice.
Related reading
- Kill Cliff Ignite: the full caffeine guide
- Red Bull: the full caffeine guide
- The verified caffeine database
- Every drink compared: the comparisons index
- Compare any two of 120+ drinks
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Gear from this guide
FAQ
Does Kill Cliff Ignite or Red Bull have more caffeine? Kill Cliff Ignite: 150mg per 12 oz can versus 80mg per 8.4 oz can for Red Bull.
Which is stronger per ounce? Kill Cliff Ignite, at about 12.5mg per fluid ounce versus 9.5mg for Red Bull.
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