McDonald's iced coffee vs Celsius: which has more caffeine?

Celsius has more caffeine than McDonald's iced coffee on both counts: 200mg per 12 oz can against 133mg per 11.5 oz medium, and about 17mg per fluid ounce against 12. 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.

McDonald's iced coffee vs Celsius: the numbers

Sources: McDonald's iced coffee's figure is verified in our McDonald's iced coffee caffeine guide against Caffeine Informer (source); Celsius's figure is verified in our Celsius guide against Celsius essential facts (source).

Which one should you pick?

Pick McDonald's iced coffee when you want the lighter dose or a slower ramp, and Celsius 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

• McDonald's iced coffee: the full caffeine guide
• Celsius: the full caffeine guide
• The verified caffeine database
• Every drink compared: the comparisons index
• Compare any two of 120+ drinks

FAQ

Does McDonald's iced coffee or Celsius have more caffeine? Celsius: 200mg per 12 oz can versus 133mg per 11.5 oz medium for McDonald's iced coffee.

Which is stronger per ounce? Celsius, at about 16.7mg per fluid ounce versus 11.6mg for McDonald's iced coffee.