Caffeine & Sleep
Soda

Caffeine in A&W Root Beer

0mg
per 12 oz
0% of FDA daily max

Is that a lot?

A&W Root Beer is 0% of the FDA’s recommended daily maximum, in a single 12 oz.

A&W Root Beer
0 mg
Green tea
28 mg
Espresso
63 mg
Red Bull
80 mg
Coffee
95 mg
FDA daily max · 400mg
Before bed

When can I drink A&W Root Beer and still sleep?

Your A&W Root Beer cutoff
You drink it at
Bedtime
A&W Root Beer · 0 mg · assuming an average ~5 h half-life
At bedtime
0 mg
close to optimal
Latest safe A&W Root Beer: 11:00 PM

How much caffeine is in A&W Root Beer?

A&W Root Beer is caffeine-free, carrying zero milligrams in its 12 oz can. The creamy, vanilla-rich flavor comes with 46 grams of sugar but no caffeine at all.

ServingCaffeineSugar
12 oz0 mg46 g

caffeine-free

Will A&W Root Beer affect your sleep?

With no caffeine, A&W Root Beer has zero impact on sleep from a stimulant standpoint. It's a safe choice for an evening soda, though the sugar is still worth keeping in mind.

Source: Manufacturer label

Related drinks

A&W Root Beer & sleep — FAQ

No, A&W Root Beer is caffeine-free, so it won't keep you up, though its sugar content near bedtime may still affect how easily you settle.

A&W Root Beer has 0 mg per 12 oz — about 0% 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 A&W Root Beer drops below the ~50 mg “ok to sleep” threshold for your bedtime.

Track your caffeine. Sleep better.

The app does this live all day — one-tap logging, widgets, and a 30-minute pre-cutoff reminder. Free, no ads.

Get the App — it’s free