Starbucks Flat White vs Red Bull: which has more caffeine?

Starbucks Flat White has more caffeine than Red Bull on both counts: 195mg per 16 oz grande 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.

These are different categories of drink, which changes how the caffeine arrives. Energy drinks and sodas list an exact number because caffeine is a measured additive; brewed drinks vary with the beans and the brew, so their figures are compiled averages. The numbers here are the standard published values for each.

Starbucks Flat White vs Red Bull: the numbers

Sources: Starbucks Flat White's figure is verified in our Starbucks Flat White caffeine guide against Starbucks nutrition listing (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 Starbucks Flat White 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

• Starbucks Flat White: 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

FAQ

Does Starbucks Flat White or Red Bull have more caffeine? Starbucks Flat White: 195mg per 16 oz grande versus 80mg per 8.4 oz can for Red Bull.

Which is stronger per ounce? Starbucks Flat White, at about 12.2mg per fluid ounce versus 9.5mg for Red Bull.