Starbucks Caffe Americano vs Dunkin iced coffee (medium): which has more caffeine?

Dunkin iced coffee (medium) carries more total caffeine per serving (297mg per 24 oz medium vs 225mg per 16 oz grande), but ounce for ounce Starbucks Caffe Americano is actually the stronger drink at about 14mg per fluid ounce against 12. Which one "has more caffeine" depends on whether you measure the container or the concentration.

Starbucks Caffe Americano vs Dunkin iced coffee (medium): the numbers

Sources: Starbucks Caffe Americano's figure is verified in our Starbucks Caffe Americano caffeine guide against Starbucks nutrition listing (source); Dunkin iced coffee (medium)'s figure is verified in our Dunkin iced coffee (medium) guide against Caffeine Informer Dunkin guide (source).

Which one should you pick?

Pick Starbucks Caffe Americano when you want the lighter dose or a slower ramp, and Dunkin iced coffee (medium) 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 Caffe Americano: the full caffeine guide
• Dunkin iced coffee (medium): the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does Starbucks Caffe Americano or Dunkin iced coffee (medium) have more caffeine? Dunkin iced coffee (medium): 297mg per 24 oz medium versus 225mg per 16 oz grande for Starbucks Caffe Americano.

Which is stronger per ounce? Starbucks Caffe Americano, at about 14.1mg per fluid ounce versus 12.4mg for Dunkin iced coffee (medium).