Starbucks Flat White vs brewed black tea: which has more caffeine?

Starbucks Flat White has more caffeine than brewed black tea on both counts: 195mg per 16 oz grande against 47mg per 8 oz cup, and about 12mg per fluid ounce against 6. 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 brewed black tea: the numbers

Sources: Starbucks Flat White's figure is verified in our Starbucks Flat White caffeine guide against Starbucks nutrition listing (source); brewed black tea's figure is verified in our brewed black tea guide against USDA FoodData Central (source).

Which one should you pick?

Pick brewed black tea 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
• brewed black tea: 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 brewed black tea have more caffeine? Starbucks Flat White: 195mg per 16 oz grande versus 47mg per 8 oz cup for brewed black tea.

Which is stronger per ounce? Starbucks Flat White, at about 12.2mg per fluid ounce versus 5.9mg for brewed black tea.