Tea Caffeine Comparison
Compare the estimated caffeine in three teas side by side, with ranges that reflect real brewing variation.
Estimated caffeine comparison
| Tea | Per serving | Selected total | Relative level |
|---|
Health Canada lists 30 to 50 mg for a 237 ml brewed black or green tea and a 400 mg daily maximum for adults. Individual advice can be lower, and actual tea can fall outside these estimates.
Why tea caffeine varies
Tea type is only one factor. Leaf amount, particle size, water temperature, steep time, and repeated infusions can all change the cup.
Tea caffeine questions
Which tea has the most caffeine?
Matcha can be higher because the powdered leaf is consumed. Strong black tea and yerba mate can also be substantial, but preparation matters.
Does green tea have caffeine?
Yes. Health Canada groups brewed green and black tea in a 30 to 50 mg range per 237 ml serving.
Is herbal tea caffeine-free?
Many herbal infusions are naturally caffeine-free, but check the label because blends may include true tea, mate, guarana, or other caffeine sources.
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