Caffeine & Sleep
Soda

Caffeine in Diet Dr Pepper

41mg
per 12 oz
≈ 1 Red Bull10% of FDA daily max

Is that a lot?

Diet Dr Pepper is 10% of the FDA’s recommended daily maximum, in a single 12 oz.

Green tea
28 mg
Diet Dr Pepper
41 mg
Espresso
63 mg
Red Bull
80 mg
Coffee
95 mg
FDA daily max · 400mg
Before bed

When can I drink Diet Dr Pepper and still sleep?

Your Diet Dr Pepper cutoff
You drink it at
Bedtime
Diet Dr Pepper · 41 mg · assuming an average ~5 h half-life
At bedtime
14 mg
close to optimal
Latest safe Diet Dr Pepper: 11:00 PM

How much caffeine is in Diet Dr Pepper?

Diet Dr Pepper carries about 41 mg of caffeine in a 12 oz can, the same as the zero-sugar version, with no sugar. It's a mild caffeine source dressed in that signature blend of flavors.

ServingCaffeineSugar
12 oz41 mg0 g

Will Diet Dr Pepper affect your sleep?

At 41 mg, Diet Dr Pepper begins below the 50 mg threshold and clears within a couple of hours. An evening can rarely stands in the way of falling asleep.

Source: Manufacturer label

Related drinks

Diet Dr Pepper & sleep — FAQ

Unlikely, with about 41 mg per can it sits below the 50 mg threshold, so Diet Dr Pepper shouldn't keep most people up.

Diet Dr Pepper has 41 mg per 12 oz — about 10% of the FDA’s 400 mg daily maximum for healthy adults.

It depends on your bedtime and how fast you clear caffeine. Use the calculator above to see when Diet Dr Pepper drops below the ~50 mg “ok to sleep” threshold for your bedtime.

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