How Much Caffeine in Black Tea? (vs. Coffee and Green Tea)

Black tea is the cup most of us reach for when the alarm goes off. It's bold, it takes milk well, and it has enough of a lift to get you moving. But if you've ever wondered exactly how much caffeine in black tea you're actually drinking, the honest answer is a range, not a single number. Here's what that range looks like, how it stacks up against coffee and green tea, and the easy ways to turn it up or down.

The short version: an average 8 oz cup of brewed black tea has about 47 to 48 mg of caffeine, and most cups land somewhere between 20 and 60 mg depending on the tea and how you brew it. That's roughly half of what you'd get from the same size cup of coffee.

How much caffeine is in black tea, per cup?

Mayo Clinic lists brewed black tea at 48 mg per 8 oz cup. The U.S. Food and Drug Administration puts a 12 oz cup at 71 mg, which works out to about 47 mg for 8 oz. Two big health sources, nearly the same number, so that's a good place to anchor.

Real cups wander from that average, though. When researchers tested popular black teas steeped for three to five minutes, the results ran from about 20 mg on the low end to around 60 mg on the high end, all from the same 8 oz pour. Same category of tea, three times the caffeine from one box to the next.

A few things to keep in mind when you look at any caffeine number for tea:

• It's per 8 oz. Plenty of mugs hold 12 ounces or more, so your morning mug may hold quite a bit more than the listed amount.
• It's an average. No two harvests are identical, and the way you brew matters as much as the leaf.
• It's brewed tea, not dry leaf. Caffeine content in dry leaf tells you what's possible. What ends up in your cup depends on how much of it the water pulls out.

Black tea caffeine vs. coffee, green tea, and herbal tea

Here's how a standard 8 oz cup compares, using figures from Mayo Clinic and the FDA:

• Brewed coffee: about 96 mg on average, and the FDA's range works out to roughly 75 to 165 mg for 8 oz. An espresso shot has about 63 mg in a single ounce.
• Black tea: about 47 to 48 mg on average.
• Green tea: about 25 to 29 mg on average.
• Decaf black tea: about 2 mg.
• Herbal tea: none, as long as the blend is made from herbs, fruit, and flowers and contains no tea leaf (or caffeinated plants like yerba maté).

So black tea sits comfortably in the middle. It gives you a real lift with about half the caffeine of a cup of coffee, which is why so many people keep it as their morning cup and save coffee for the days they need a bigger push. If you want to compare every tea type side by side, our types of tea list with caffeine content walks through all of them.

What raises or lowers the caffeine in your cup

Good news if you like to tinker: you can steer this. A study of black and green tea infusions found that the tea itself (where it's grown, how it's processed, the size of the leaf) and the way you prepare it (how much tea, how much water, how long it steeps) all change what ends up in the cup. In practice, that comes down to five levers.

Steep time

The longer the leaves sit in hot water, the more caffeine they give up. In that same lab testing of popular black teas, most cups had noticeably more caffeine at five minutes than at one. For a full-flavored cup with a little less caffeine, try steeping on the shorter end, around three minutes. For your strongest morning brew, go the full five. Past five minutes, black tea tends to turn bitter.

Water temperature

Hot water pulls caffeine out faster than cool water. Black tea is meant for water at or just off the boil, and that's what gives it its body. Cold brewing, where the tea steeps in the fridge overnight, extracts more gently and makes a smooth, mellow glass. It's a lovely way to drink black tea in warm weather.

How much leaf you use

This one is simple: more tea, more caffeine. A flat teaspoon of loose leaf per cup is our everyday starting point. A heaping spoonful (or an extra one "for the pot") makes a stronger cup in every sense.

The leaf itself

Not all black teas are built the same. The tea plant's variety, the growing conditions, and how young the leaves are when they're picked all play a part. Leaf size matters too. Small, broken leaves, like the ones in most tea bags, release their caffeine quickly. Larger whole leaves give theirs up more gradually over the steep.

Blends with fruit, flowers, and spice

A spoonful of a flavored black tea blend often includes citrus peel, flower petals, spices, or herbs alongside the tea leaf. Since those extras don't contain caffeine, a scoop of a blend usually holds a little less tea, and a little less caffeine, than a scoop of straight black tea. It won't turn your morning cup into an herbal tea, but it's one more reason two cups of "black tea" can taste and feel so different.

Black teas to try (and how strong to brew them)

If you want a cup with some backbone, breakfast-style blends are the place to start. Here are a few we love, along with how we like to brew them.

• Fog Cutter Black Tea is our Irish Breakfast, a rich, malty black tea brightened with real lemon peel. Steep it the full five minutes on a slow-to-start morning.
• Heritage Blend Black Tea is a Scottish Breakfast of Assam, African, and Darjeeling black teas with a warm hint of maple. It's made for a splash of milk.
• Builder's Blend Black Tea is bold and malty with smooth caramel notes, our take on a classic UK builder's tea. Brew it strong and add milk.
• Mindful Morning Blend is an Earl Grey Creme with Italian bergamot and vanilla over a smooth Ceylon black tea base. It also comes in a decaf version.

You can browse the full range in our black tea collection. If you're curious about specific styles, we've also dug into how much caffeine is in Earl Grey tea, English Breakfast tea, and chai.

Does decaf black tea have caffeine?

A little, yes. Decaffeination removes most of the caffeine but never quite all of it, so Mayo Clinic lists decaf black tea at about 2 mg per 8 oz cup. Compare that to the 47 or 48 mg in a regular cup and you can see why decaf is such an easy evening swap.

Our decaf black teas are decaffeinated using a clean, natural carbon dioxide method, so you keep the full black tea flavor. Decaf Comfort Blend Black Tea is a classic orange spice, with sweet orange, cinnamon, ginger, and clove, and it tastes like the holidays in a mug. You'll find the rest in our decaf black teas, and if you want the full story, here's how much caffeine is in decaf tea and how the process works.

When to drink black tea: afternoon and evening

Caffeine sticks around longer than most of us think. In a study shared by the American Academy of Sleep Medicine, a large dose of caffeine taken even six hours before bed cut people's sleep by more than an hour, and they didn't notice it the next morning. The researchers suggested avoiding caffeine after 5 p.m.

That study used a big dose, about what you'd get from several mugs of coffee, and everyone's sensitivity is different. Still, if you've had trouble falling asleep, your afternoon tea is a good place to look. A few gentle ways to keep the ritual without the late-night buzz:

• ☕ Save your strongest, longest-steeped cup for the morning.
• ☕ Brew your afternoon black tea on the shorter side, about three minutes.
• ☕ Switch to a decaf black tea once the afternoon slides into evening.
• ☕ Go fully caffeine-free after dinner with one of our herbal tea blends.

For most healthy adults, both the FDA and Mayo Clinic say up to 400 mg of caffeine a day is generally fine. That works out to roughly eight average cups of black tea, so for most people, timing matters more than the total. If you're pregnant, nursing, or take medication that interacts with caffeine, check with your doctor about what's right for you.

Frequently asked questions

How much caffeine is in a cup of black tea?

An average 8 oz cup of brewed black tea has about 47 to 48 mg of caffeine. Depending on the tea and how long you steep it, most cups fall between about 20 and 60 mg.

Does black tea have more caffeine than coffee?

No. An 8 oz cup of brewed coffee averages about 96 mg of caffeine, roughly twice what's in the same size cup of black tea.

Does black tea have more caffeine than green tea?

Usually, yes. Green tea averages about 25 to 29 mg per 8 oz cup, compared with about 47 to 48 mg for black tea, though individual cups of either can vary quite a bit.

Does steeping black tea longer add more caffeine?

Yes. Longer steeps pull more caffeine from the leaves, and most black teas have noticeably more caffeine at five minutes than at one. Hotter water and more leaf raise it too.

Can I drink black tea at night?

Regular black tea in the evening can keep some people awake, since caffeine lingers for hours. A decaf black tea, with about 2 mg per cup, or a caffeine-free herbal blend is a better pick after dinner.