What You Need to Know About Caffeine in Specialty Coffee

You drink coffee to wake up, focus, or push through a long drive — but how does caffeine actually work? And why do some people crash after one cup while others feel nothing? Most coffee drinkers know it gives a kick, but few understand what determines that effect or how much is really in their drink.

Coffee typically contains 60–65mg of caffeine per 100cc (about a small cup). That’s less than black tea (200–300mg), green tea (350–400mg), and cocoa (100mg), but enough to stimulate alertness for many people.

What Is Caffeine and How Does It Work?

Caffeine is a mild stimulant found not just in coffee, but also in tea, cocoa, chocolate, some soft drinks like cola, and certain medications. Its main effect is accelerating your metabolism and blocking adenosine receptors in the brain, which helps you feel more awake, focused, and mentally sharp.

In coffee specifically, caffeine stimulates the cerebral cortex — improving touch sensitivity, thinking speed, and even adjusting heart function. It also dilates blood vessels in the kidneys, increasing urine production (a diuretic effect).

How Long Does Caffeine Stay in Your System?

Caffeine can remain active in your body for several hours, but its effects vary greatly from person to person. Some people report insomnia if they drink coffee in the evening, while others may feel jittery, nervous, or overstimulated after too much. Many people, however, experience no negative effects at all.

Your individual tolerance, metabolism, and even genetics determine how caffeine affects you. That’s why some use it strategically — for late-night study sessions or long road trips — while others avoid it in the afternoon.

How Much Caffeine Is Actually in Your Drink?

Here’s how common beverages and foods compare in caffeine content per 100cc:

• Coffee: 60–65mg
• Green tea: 200–300mg
• Black tea: 350–400mg
• Cocoa: 100mg

That means your average cup of coffee has less caffeine than a cup of green or black tea, though most coffee servings are larger, so total intake may still be significant. Keep in mind: consuming too much caffeine can lead to ringing in the ears, rapid heartbeat, or an irregular pulse — so moderation is key.

Why Does Solubility Matter for Caffeine Extraction?

Caffeine dissolves much more easily in hot water than in cold. That’s one reason traditional hot brewing methods extract it efficiently. The heat helps release caffeine along with other compounds that affect flavour and stimulation.

While caffeine is just one part of coffee’s overall effect, its solubility plays a role in how quickly and completely it enters your cup — especially in different brewing methods.

Frequently Asked Questions

How much caffeine is in a typical cup of coffee?

A standard 100cc (about 3.4 fl oz) cup of coffee contains 60–65mg of caffeine. Most served cups are larger, so total caffeine intake may be higher, but still generally less than a strong black or green tea.

Does tea or coffee have more caffeine?

Per 100cc, black tea contains 200–300mg and green tea 350–400mg — both significantly more than coffee’s 60–65mg. However, coffee servings are often bigger, which can balance or exceed total caffeine intake depending on preparation.

Why do some people react strongly to caffeine and others don’t?

Individual responses to caffeine depend on factors like metabolism, body weight, tolerance, and genetics. Some people feel wired or can’t sleep after a single cup, while others notice little to no effect even with several cups.

Can you drink coffee too late in the day?

Yes. Because caffeine can stay active for hours, drinking it late in the day may disrupt sleep for some people. If you’re sensitive, avoid coffee in the evening to prevent insomnia or restlessness.

Is caffeine bad for your heart?

In moderate amounts, caffeine is generally safe for most people. But excessive intake can cause a racing heart, palpitations, or irregular pulse. Stick to recommended levels to avoid these side effects.

Recommended FrontStreet Beans for Caffeine Lovers

FrontStreet Coffee’s Ethiopia Humbera (Yirgacheffe region) brings bright citrus and floral tones with a crisp acidity — ideal for those seeking a lively, energising cup. Their PWN Golden Mandheling delivers a full-bodied, syrupy profile with notes of dark caramel and mild spice, great for sustained energy without excessive brightness. For something fruit-forward, try Kenya Little Tomato: juicy red berries and winey acidity provide a vibrant jolt. All three offer smooth yet stimulating experiences. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.