How Much Caffeine Is In Tea vs Coffee? | The Real Breakdown

It’s easy to assume coffee wins the caffeine contest hands down. A strong cup of joe wakes you up fast, while tea is often seen as the gentler morning option. But the raw numbers tell a more interesting story: tea leaves themselves contain more caffeine by weight than coffee beans. So why does your coffee end up with a bigger buzz?

The answer lies in brewing. Coffee uses hotter water, more grounds per cup, and longer contact time — all of which pull more caffeine out of the beans. Tea, steeped at cooler temperatures and typically for just a few minutes, extracts only a fraction of the caffeine hiding inside the leaves. This article breaks down the exact numbers for both drinks using data from authoritative health sources.

Brewed Coffee vs. Brewed Tea: The Numbers

According to data from the Mayo Clinic, an 8-ounce cup of brewed coffee contains about 95 mg of caffeine. By comparison, the same size cup of black tea delivers roughly 47 mg — less than half. Green tea is even lower, with about 28 mg per cup.

Instant coffee falls somewhere in the middle, providing around 62 mg per 8-ounce serving. Decaffeinated coffee clocks in at just 2 mg. Espresso is concentrated: a 1.5-ounce shot contains about 63 mg, so an 8-ounce latte made with one or two shots can range from 63 to 126 mg depending on the barista’s pour.

One older PubMed study found mean caffeine values of 118 mg for brewed coffee, 62 mg for instant coffee, and 27 mg for tea. While individual cups vary, the pattern holds: coffee consistently delivers two to three times more caffeine than tea per standard serving.

Why Coffee Wins the Caffeine Race

If tea leaves have more caffeine by weight, why does coffee come out ahead? It comes down to how much plant material you use and how you treat it during brewing.

• Water temperature: Coffee is brewed near boiling — between 195°F and 205°F — which extracts caffeine efficiently. Tea is usually steeped at lower temperatures (175°F for black tea, 160°F for green), pulling out less caffeine.
• Amount of dry material: A typical cup of coffee uses 10 to 15 grams of grounds. A single tea bag contains only about 2 to 3 grams of leaves. Less plant material means less total caffeine available.
• Brewing time: Coffee brews for 4–5 minutes (or longer with immersion methods). Tea is often steeped for 2–5 minutes, limiting how much caffeine makes it into your cup.
• Grind and roast: Finer coffee grounds extract faster, and lighter roasts may retain slightly more caffeine than darker roasts. Tea leaf processing — like oxidation for black tea — also affects the final caffeine level.

Because of these factors, your morning coffee usually ends up with two to three times the caffeine of a standard cup of tea. But the gap can shrink or widen depending on how you prepare each drink.

How Much Caffeine You’re Actually Getting

Tea leaves contain about 4% caffeine by weight, while coffee beans range from 0.9% to 2.6% — a fact Healthline highlights in its caffeine content in raw leaves comparison. That means a gram of dry tea has more caffeine than a gram of coffee grounds. But since you use far more coffee grounds per cup, the final drink is stronger.

Serving size also matters. A large 12-ounce mug of black tea steeped for 5 minutes could deliver 70–80 mg of caffeine — not far behind a small 6-ounce cup of brewed coffee (about 70–90 mg). An espresso-based drink like a cappuccino or latte typically contains a single shot’s worth of caffeine (about 63 mg), but a 16-ounce version from a coffee shop might include two shots, bringing it up to 126 mg.

So when someone asks how much caffeine is in tea vs coffee, the short answer is coffee usually wins per ounce. But the real answer depends on cup size, brew strength, and the specific variety you choose.

Factors That Change the Caffeine Content

Your actual caffeine intake can shift noticeably based on a handful of simple variables. Here are the most influential ones:

1. Brewing time: Longer steeping extracts more caffeine from both tea leaves and coffee grounds. Steeping black tea for 5 minutes instead of 2 can increase caffeine content by 20–30%.
2. Water temperature: Hotter water speeds up extraction. Cold-brew coffee and sun tea take hours to reach similar caffeine levels because the water is cool.
3. Plant variety: Robusta coffee beans contain about twice the caffeine of Arabica beans. Assam black tea has more caffeine than white or oolong teas.
4. Grind size: Finer coffee grounds release caffeine faster, which matters for espresso vs. drip methods.
5. Serving size: A large 16-ounce mug of tea can easily deliver 80–100 mg, rivaling a standard coffee cup.

These variables mean two cups of “black tea” can differ in caffeine by 30 mg or more. The same is true for coffee: a dark roast drip coffee from one cafe might have 20% less caffeine than a lighter roast from another.

Daily Caffeine Limits and What This Means for You

Most healthy adults can consume up to 400 mg of caffeine per day without adverse effects, according to the brewed coffee caffeine content guidance from Mayo Clinic. That’s roughly four 8-ounce cups of brewed coffee or about eight cups of black tea.

People who are pregnant, have anxiety disorders, or take certain medications may need lower limits — often 200 mg per day or less. Caffeine sensitivity varies widely; some individuals feel jittery after a single cup of tea, while others can drink coffee late into the evening and sleep fine.

If you’re tracking caffeine for sleep quality or heart health, it helps to measure both your drink size and brewing method. A large restaurant-style iced tea can pack 100 mg, and an energy drink might push you past your personal limit much faster than coffee would.

Drink	Serving Size	Caffeine (mg)
Brewed coffee	8 oz	~95
Instant coffee	8 oz	~62
Espresso shot	1.5 oz	~63
Black tea	8 oz	~47
Green tea	8 oz	~28
Decaf coffee	8 oz	~2

These numbers are averages from the Mayo Clinic. Your actual cup could be higher or lower depending on the brand, how long you steep, and the specific coffee bean or tea leaf variety you’re using.

The Bottom Line

Coffee contains roughly double the caffeine of an equal-sized cup of tea, but individual results vary widely. The most important takeaway: pay attention to your own brew method and cup size rather than relying on one-size-fits-all averages. If you’re sensitive to caffeine or managing a health condition, track how different preparations affect your energy and sleep.

To get a personalized caffeine target that fits your medical history, check with your primary care provider or a registered dietitian who can account for any medications or conditions you have.