Caffeine in drinks
Does Root beer have caffeine?
Data checked against the source on 2026-10-03 by Oleksii Y.
Usually not. Mayo Clinic lists Root beer at 0 mg of caffeine per 8 fl oz (237 ml), most brands, but not every brand is caffeine-free (see “Good to know” below).
Good to know
Most root beers have no caffeine, but CSPI's chart lists Barq's Root Beer at 22 mg per 12 oz.
Root beer vs other root beer and ginger ale drinks
- A&W Root Beer: Root beer has about the same amount of caffeine as A&W Root Beer per 100 ml (0 vs 0 mg). Root beer: 0 mg per 8 fl oz (237 ml), most brands; A&W Root Beer: 0 mg per 12 fl oz can.
- Canada Dry Ginger Ale: Root beer has about the same amount of caffeine as Canada Dry Ginger Ale per 100 ml (0 vs 0 mg). Root beer: 0 mg per 8 fl oz (237 ml), most brands; Canada Dry Ginger Ale: 0 mg per 12 fl oz can.
Common questions
Does Root beer have caffeine?
Mayo Clinic lists Root beer at 0 mg of caffeine per 8 fl oz (237 ml), most brands. That does not cover every brand: Most root beers have no caffeine, but CSPI's chart lists Barq's Root Beer at 22 mg per 12 oz.
Where the number comes from
- Caffeine content for coffee, tea, soda and more. Mayo Clinic. Sodas table, row "Root beer (most brands) | 8 (237) | 0" Accessed 2026-10-02. Source ↗
- Caffeine chart. Center for Science in the Public Interest. row "Barq's Root Beer | 12 oz. | 22" Accessed 2026-10-02. Source ↗
Recipes and labels change. If a number here no longer matches the label, the label wins.
General information, not medical advice
If you feel unwell after caffeine — for example chest pain, a fast or irregular heartbeat that does not settle, fainting, confusion or trouble breathing — get urgent medical help. If you are pregnant, take medication or have a heart, liver or anxiety condition, ask a doctor or pharmacist what amount is right for you.
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