The short answer on how much caffeine in black tea you get: a moderate amount — on average roughly 40 to 70 mg per 8 oz (240 ml) cup. That is more than green, white or oolong tea, but usually only about half of what a same-size cup of brewed coffee delivers. The catch is that this is a rough, variable range: the real figure shifts with the tea itself, how much leaf you use, how hot your water is and how long you let it steep.
So yes, if you were wondering does black tea have caffeine, the answer is a clear yes — it is one of the more caffeinated true teas. Below we break down the rough number, what pushes it up or down, whether decaf still counts, and simple ways to pour a lighter cup. For what black tea actually is, see our guide to black tea; for the broader question of whether tea contains caffeine at all, see does tea contain caffeine.
How much caffeine in black tea, on average
Most references put a standard 8 oz (240 ml) cup of black tea somewhere in the 40 to 70 mg range, with many everyday cups landing around 45 to 50 mg. Treat that as a ballpark rather than a lab reading — the black tea caffeine content in your mug depends on far more than the words "black tea" printed on the box. As a rule of thumb, black tea sits above green and white tea for caffeine, roughly level with or a little above oolong, and clearly below coffee.
Here is a rough, hedged look at caffeine per typical cup. The ranges overlap and every figure is an average, not a promise:
| Drink (about 8 oz / 240 ml) | Rough caffeine per cup |
|---|---|
| Brewed coffee | ~80-100 mg |
| Black tea | ~40-70 mg |
| Oolong tea | ~30-50 mg |
| Green tea | ~20-45 mg |
| White tea | ~15-30 mg |
| Decaf black tea | ~2-5 mg (a trace) |
| Herbal "tea" (tisane) | ~0 mg (naturally caffeine-free) |
Because these bands overlap so much, a strong cup of green tea can out-caffeinate a weak cup of black tea. For a wider drink-by-drink view — sodas, energy drinks, espresso and more — see our roundup of caffeine in drinks compared. The oolong figure has its own quirks, which we cover in how much caffeine in oolong tea.
What changes the caffeine in your cup
Two people can brew "the same" black tea and end up with very different caffeine. These are the levers that matter most:
Leaf style: whole leaf vs broken and CTC
Finely broken leaf and CTC (crush-tear-curl) tea — the small, granular style used in most tea bags and many strong breakfast blends — expose more surface area to the water, so they tend to release caffeine faster and can brew a higher-caffeine cup than large whole-leaf tea steeped for the same time. A delicate whole-leaf Darjeeling and a robust CTC blend from the Assam valley can genuinely differ here.
How much leaf you use
More leaf means more caffeine, simply. A heaped spoon or a doubled-up tea bag raises the dose; a light hand lowers it. Roughly 2 g (about a teaspoon) per cup is a common starting point.
Water temperature and steep time
Hotter water and longer steeps pull out more caffeine. Black tea is usually brewed with near-boiling water (about 95-100 C / 205-212 F) for 3 to 5 minutes, which is part of why it lands higher than green or white tea, both of which are brewed cooler. Stretch a steep from three minutes to five and you extract noticeably more.
Re-steeps give progressively less
Whole-leaf black tea can be steeped more than once, and each subsequent infusion carries less caffeine than the one before, because a good share of it comes out early. The first cup from a fresh spoonful is the strongest; the second and third taper off.
Black tea vs coffee caffeine
The headline on black tea vs coffee caffeine is simple: cup for cup, coffee usually wins. A typical mug of brewed coffee runs around 80 to 100 mg, so a cup of black tea generally lands at roughly half of that. This is why many people who are cutting back — but not quitting — swap an afternoon coffee for black tea rather than going straight to herbal. Black tea also carries L-theanine, an amino acid many drinkers feel gives its lift a smoother, steadier character than coffee, though experiences vary from person to person.
Does decaf black tea have caffeine?
A little — decaffeinated is not the same as caffeine-free. Decaf black tea typically retains a small trace, often in the ballpark of a few milligrams per cup, because commercial decaffeination removes most but not quite all of the caffeine. If you need a genuinely caffeine-free hot drink, a herbal infusion (a tisane such as rooibos, chamomile or peppermint) is the reliable choice, since those are not made from the tea plant at all. As always, exact residual amounts vary by brand and process, so any figure here is a rough guide.
How to get less caffeine from black tea
If you love the taste but want a gentler cup, a few small changes stack up:
- Steep for less time. A shorter infusion — say two to three minutes instead of five — extracts less caffeine (and a milder, less astringent flavour).
- Use slightly cooler water and a little less leaf. Both dial the extraction down.
- Choose a whole-leaf tea over a strong CTC breakfast blend if you want a softer, slower release.
- Reach for a later steep. Since the first infusion pulls the most, a second or third cup from the same leaf is naturally lighter.
- Pick a decaf or an herbal tisane when you want almost none at all.
One popular tip — briefly steeping and discarding a first "rinse" to strip the caffeine at home — is largely a myth. Research suggests only a modest fraction of the caffeine comes out in the first 30 seconds, so a quick rinse removes far less than most people assume while pouring away flavour. If low caffeine really matters to you, decaf or herbal is the dependable route.
Who might want to watch black tea caffeine
For most adults, a few cups of black tea a day is an unremarkable amount of caffeine. Some people, though, are more mindful of it: anyone drinking tea late in the day who is sensitive to disrupted sleep, people who simply feel jittery on caffeine, and those who are pregnant, breastfeeding or managing a health condition may prefer to keep an eye on their overall intake across all drinks — not just tea.
These are general notes, not medical guidance. Responses to caffeine vary a lot from person to person, and this is not medical advice — if you have specific concerns about caffeine, ask your own doctor or healthcare provider, who can factor in your situation.
The bottom line
Black tea gives you a moderate, useful dose of caffeine — call it 40 to 70 mg a cup as a working figure, more than the other true teas but about half of coffee, with plenty of room to move up or down depending on how you brew. If you steep hot, long and with plenty of broken leaf, you land near the top of that range; go cooler, shorter and lighter, and you land near the bottom. Knowing which levers you are pulling is the whole trick to getting the cup — and the lift — you actually want.