Coming From Coffee
Tea vs coffee caffeine
Everyone quotes a number. Almost nobody can tell you where theirs came from, so here is what is actually established.
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Tea generally has less caffeine than coffee per cup. Beyond that, most of what circulates is less certain than it sounds, so this page separates what is established from what is repeated.
What a regulator actually publishes
The FDA cites 400 milligrams a day as an amount not generally associated with negative effects for healthy adults, and estimates that toxic effects such as seizures can be observed with rapid consumption of around 1,200 milligrams.
The FDA also notes wide variation both in how sensitive people are to caffeine and in how fast they clear it, and advises anyone with a relevant condition, taking medication, pregnant, trying to become pregnant or breastfeeding to speak to their health care provider.
That is the ceiling. It is a useful reference point precisely because it comes from a regulator rather than from a seller.
Why per-cup tea figures are ranges, not numbers
Every caffeine figure you see for a cup of tea depends on at least five things, and none of them is fixed by the tea type.
- How much leaf. Double the dose and you roughly double the caffeine. Art of Tea's published starting point is about a tablespoon per 8 ounces, and plenty of people use half that.
- How long it steeps. Caffeine extracts progressively; a five-minute steep pulls more than a two-minute one.
- Water temperature. Hotter water extracts caffeine faster, which is why the same tea brewed at 212F and 175F differs.
- The specific tea. Cultivar, growing conditions, leaf grade and how the leaf was processed all move it.
- Serving size. An 8 oz figure and a 12 oz mug are not the same drink.
So a headline like black tea has 47 mg is a midpoint of a range that a brewer can move substantially in either direction. It is not wrong; it is far less precise than its presentation suggests.
What we will not tell you
We are not printing a caffeine table by tea type. Getting one would mean copying figures from another site that copied them from somewhere else, and the honest version of this page says so rather than adding another link to that chain.
If you need a specific figure, the only reliable source is the vendor of the tea you actually bought, and even they are usually publishing a range.
The one thing that is reliably true
| Claim | Confidence |
|---|---|
| Tea generally has less caffeine per cup than coffee | High — consistent across every source |
| Herbal tisanes contain no caffeine | High — they are not tea |
| Steep time and dose change a cup's caffeine substantially | High — this is how extraction works |
| Any single mg figure for a tea type | Low — it is a midpoint of a wide range |
| Green tea always has less caffeine than black | Low — commonly repeated, not reliably true |
That last row is the folklore item worth challenging. It is repeated constantly and the variation within each type is large enough that it does not hold as a rule.
L-theanine, briefly and carefully
Tea contains L-theanine, an amino acid, and the common claim is that it modulates caffeine's effect to produce a calmer alertness than coffee.
There is real research on L-theanine and we are not in a position to summarize it responsibly — we are a gear site, not a health publication. Many people report the difference subjectively. Treat it as a widely reported experience rather than as an established mechanism, and be skeptical of any tea seller stating it as settled fact.
Practically, if you are switching
You will probably need more cups of tea than cups of coffee to get the same lift, and you will get it more gradually. Several tea drinkers describe that as the main appeal of the switch.
If you specifically want the strongest cup tea can give, that is a brewing question more than a leaf question, and it has its own page.
Questions
Does tea have less caffeine than coffee?
Generally yes, per cup, and that is consistent across sources. The size of the gap depends heavily on dose, steep time and the specific tea, so a single number is misleading.
How much caffeine is safe per day?
The FDA cites 400 milligrams a day as an amount not generally associated with negative effects for healthy adults, and notes wide variation in individual sensitivity.
Does green tea have less caffeine than black tea?
Commonly claimed and not reliably true. Variation within each type is large enough that the rule does not hold, and how you brew it matters more than which type it is.
Can I reduce the caffeine in my tea?
Use less leaf, steep for less time, or brew cooler — all three reduce extraction. Herbal tisanes contain no caffeine at all because they are not made from the tea plant.
Sources
Every figure on this page came from one of these, retrieved during the research pass for this article. Where a maker publishes nothing we could verify, the page says so instead of substituting a number.
Read next
- The strongest loose-leaf teaWhat strong actually means, why brewing moves it more than leaf choice does, and how to get there without bitterness.
- Tea for coffee drinkersWhich teas suit a coffee palate, which of your coffee gear already works, and the two cheap things you still need.
- How long to steep teaPublished steep times by type, the reason the ranges are wide, and what over-steeping actually does to the cup.
- How much loose-leaf tea per cupThe published ratio, why a spoon is unreliable across tea types, and the point at which weighing starts to matter.
- Tea vs coffee cost per cupThe cost-per-cup formula, the re-steeping multiplier nobody includes, and why we publish no headline figure.