Does Black Tea Have Caffeine? How Much Is in a Cup?

If you're wondering, does black tea have caffeine? Yes. Black tea naturally contains caffeine because it comes from the Camellia sinensis plant, the same plant used to make green, white, and oolong tea.

An 8-ounce cup of black tea usually has 40–70 milligrams of caffeine. The exact amount can vary by tea type, leaf amount, and brewing method.

That puts black tea somewhere between green tea and coffee when it comes to caffeine. This makes it a popular choice when you want a little lift without as much caffeine as a cup of coffee.

How Much Caffeine Is in Black Tea?

The caffeine content of black tea isn't a single fixed number. Different teas and brewing methods can produce very different results.

As a general guide, an 8-ounce cup contains approximately:

BEVERAGE	APPROX MG OF CAFFEINE PER CUP
Black Tea	40-70 mg
Oolong Tea	30-50 mg
Green Tea	20-45 mg
White Tea	15-40 mg
Coffee	80-120 mg

These numbers are estimates rather than guarantees. The caffeine level in your cup depends on everything from the tea variety to the amount of leaf and the way you brew it.

In fact, research shows brewing temperature and steeping time also play a part in the caffeine in your cup. It also depends on whether you use loose leaf tea or a tea bag.

Why Does Black Tea Have Caffeine?

Caffeine occurs naturally in the tea plant, Camellia sinensis.

Black tea is made from the leaves of this plant. The full oxidation of the leaves during processing is responsible for black tea's characteristic dark color and rich, robust flavor.

But it isn't what creates the caffeine.

In other words, black tea doesn't have caffeine because it's black tea. It has caffeine because it's made from the tea plant.

That's also why green and white tea, as well as oolong teas, contain caffeine.

What Determines How Much Caffeine Is in Black Tea?

Two cups of black tea can have noticeably different amounts of caffeine. Here are some of the biggest factors.

The Type of Black Tea

Different varieties and styles of black tea can naturally contain different amounts of caffeine.

For example, robust Assam teas and breakfast-style blends are often chosen for their bold flavor and energizing character. Darjeeling and some lighter black teas can produce a more delicate cup.

However, you can't reliably predict the exact caffeine content simply by looking at the name of the tea. The amount of leaf and brewing method matter, too.

How Much Tea You Use

More tea leaf generally means more caffeine available to extract.

This is especially important with loose leaf tea. If you use a generous scoop of tea for a large mug, you will likely extract more caffeine. You would get less caffeine from fewer leaves in a smaller cup.

Loose Leaf vs. Tea Bags

Leaf size can affect how quickly compounds are extracted into your cup.

Broken leaves and smaller particles have more surface area exposed to the water. This can cause caffeine to extract more quickly. Whole-leaf tea generally takes more time to fully open and infuse.

That doesn't mean loose-leaf black tea is automatically lower in caffeine. The amount of tea you use and how you brew it still matter.

Steeping Time

The longer tea steeps, the more caffeine can be extracted.

If you want a stronger cup, a longer steep will generally extract more caffeine along with more flavor compounds. Research on black tea has found that longer brewing times increase caffeine extraction.

Water Temperature

Hotter water can also increase caffeine extraction.

So if you're looking to control the amount of caffeine in your cup, both temperature and steeping time are worth considering.

Does Black Tea Have More Caffeine Than Green Tea?

Usually, but not always.

Black tea is often higher in caffeine than green tea, but there is plenty of overlap.

As we mentioned earlier, a typical 8-ounce serving might contain:

• Black tea: 40–70 mg
• Green tea: 20–45 mg

But those numbers can change significantly depending on how the tea is prepared.

A strongly brewed green tea can contain more caffeine than a lightly brewed black tea. Think of black tea as having generally higher in caffeine. Rather than assuming every black tea has more caffeine than every green tea.

Green tea comes in many varieties, and caffeine levels can vary. For example, jasmine tea is usually made with a tea base such as green tea, so its caffeine comes from the tea leaves—not the jasmine flowers.

Does Black Tea Have More Caffeine Than Coffee?

No. Coffee generally contains considerably more caffeine than black tea.

An 8-ounce cup of brewed coffee can contain roughly 80–120 mg of caffeine. Black tea typically falls around 40–70 mg per 8 ounces.

Of course, coffee shop servings are often much larger than 8 ounces. So the caffeine difference can be even greater depending on what you're drinking.

Do you enjoy the ritual of a morning hot beverage but don't want as much caffeine as coffee provides? Black tea can be a nice middle ground.

Can You Reduce the Caffeine in Black Tea?

Yes. Adjust your brewing method to influence how much caffeine you extract.

Try:

• Using less tea leaf
• Steeping for a shorter amount of time
• Using slightly cooler water
• Choosing a lighter black tea
• Choosing decaffeinated black tea if you want significantly less caffeine

Keep in mind that changing your brewing method also changes the flavor of the tea. A shorter infusion may produce a lighter, less astringent cup as well as less caffeine.

Want more ways to control the caffeine in your cup? See our guide to How to Reduce Caffeine in Tea.

Does Decaf Black Tea Still Have Caffeine?

Yes.

Decaffeinated black tea isn't completely caffeine-free. The decaffeination process removes most of the caffeine, but small amounts can remain.

Need to avoid caffeine completely? Look for naturally caffeine-free herbal teas and tisanes instead. Herbal teas are not made from Camellia sinensis. They are naturally caffeine-free unless another caffeinated ingredient has been added.

What About Caffeine and L-Theanine in Black Tea?

Black tea naturally contains both caffeine and the amino acid L-theanine.

L-theanine is one reason tea has a different chemical profile from coffee. Research has found caffeine and L-theanine in black tea infusions. The amounts vary by tea type and brewing conditions.

You may hear tea described as providing a "smoother" or more balanced type of energy than coffee. That's a common personal experience. But it's better not to assume that everyone will respond to tea in exactly the same way.

Your individual sensitivity to caffeine, the amount you drink, and when you drink it all matter.

If you're comparing caffeine levels across different types of tea, see our guide to What Tea Has the Most Caffeine?

Which Black Tea Should You Choose?

If you're choosing black tea based on caffeine, don't get too caught up in trying to find one exact number.

Instead, consider the experience you're looking for.

Want a bold morning cup? Try an Assam or breakfast-style black tea.

Prefer something lighter and more delicate? A Darjeeling or lighter Ceylon may be a better fit.

Want less caffeine? Use less leaf, shorten your steep, or choose a decaffeinated black tea.

And if you're simply looking for a delicious cup of tea, flavor should be part of the equation, too. Caffeine is only one characteristic of a black tea.

The Bottom Line: Does Black Tea Have Caffeine?

Yes, black tea naturally contains caffeine.

An 8-ounce cup typically contains about 40–70 mg of caffeine, compared with roughly 80–120 mg in an 8-ounce cup of coffee.

Black tea is generally more caffeinated than green tea, but there's significant overlap. The caffeine in your particular cup depends on:

• The tea itself
• How much leaf you use
• The water temperature
• How long you steep it.

So if you love black tea but are watching your caffeine intake, you don't necessarily have to give it up. A shorter steep, less tea leaf, or a decaffeinated black tea can all help you control how much caffeine ends up in your cup.

Frequently Asked Questions

Does black tea have caffeine?

Yes. Black tea naturally contains caffeine because it is made from the Camellia sinensis plant. An 8-ounce cup typically contains about 40–70 mg.

How much caffeine is in black tea compared with coffee?

Black tea generally contains less caffeine. An 8-ounce cup of black tea typically has 40–70 mg, while brewed coffee generally contains about 80–120 mg.

Does black tea have more caffeine than green tea?

Generally, yes, but there is overlap. Brewing method can make a significant difference in the caffeine content of both teas.

Does steeping black tea longer increase caffeine?

Generally, yes. Longer steeping allows more caffeine to be extracted from the tea leaves.

Does iced tea have less caffeine than hot tea?

Not necessarily. If you brew tea hot and then pour it over ice, the caffeine has already been extracted during the hot steep. Ice cools and dilutes the tea, but it doesn't remove the caffeine.

Cold-brewed tea is a little different. Because caffeine extracts more slowly in cold water, cold-brewed tea may have less caffeine than the same tea brewed hot under similar conditions. However, steeping time, water temperature, tea-to-water ratio, and the type of tea all affect the final caffeine content.

The takeaway: Iced tea isn't automatically lower in caffeine. How you brew it matters more than whether you drink it hot or cold.

Is decaf black tea completely caffeine-free?

No. Decaffeinated black tea has had most of its caffeine removed, but small amounts can remain.

What tea has the most caffeine?

Caffeine content varies considerably by tea and brewing method, so there isn't one simple answer. If you're comparing teas specifically for caffeine, preparation matters almost as much as the type of tea.