How Much Caffeine Is in a Cup of Coffee?

Walk into the Roasterie in Kensington and you’ll hear these questions more than you’d expect.

“How much caffeine is in this?”
“Is espresso stronger?”
“I just had a huge coffee, why am I still tired?”

Fair questions. Coffee is part of daily life here. It gets us moving in the morning and keeps us going through long afternoons.

And lucky for us, caffeine helps protect mornings.
And some people’s lives too.

But caffeine isn’t about cup size alone.
Or how dark the coffee looks.
Or how intense it tastes.

There’s more going on in the cup.

A Quick Reality Check on Cup Size

A lot of people picture coffee in American sizing.

An “8 oz cup” sounds normal.
That’s about 240 ml.

But most takeaway cups are 12 oz, 16 oz, 32 oz, sometimes even larger.
That’s 355 ml to almost 500 ml of coffee.

So when someone drinks half a litre of coffee and still feels nothing.
They assume they need more coffee.
Stronger coffee.
Darker coffee.

Sometimes the answer is simpler.

A small, well-made espresso can feel more awake than a giant mug of average coffee.
Not because it contains more caffeine overall. But because of how it’s brewed, how quickly it’s consumed, and how the body reacts.

Quality changes the experience completely.

Arabica vs Robusta: Where Caffeine Really Starts

Before roast levels or brew styles, it starts with the bean.

There are two main coffee species you’ll hear about.
Arabica and Robusta.

Robusta contains significantly more caffeine.
That’s why it’s common in instant coffee and blends.

But there’s a trade-off.

Robusta often tastes harsh.
Woody.
Rubbery.
Sharp.

At the Roasterie, we roast and serve only Arabica.
Always have.

Arabica has less caffeine, but far more flavour, aroma, and balance.
The caffeine feels smoother.
Less aggressive.
Easier to enjoy.

Roast Level and Caffeine

Roast level does change caffeine, just not as dramatically as people expect.

What roasting really changes is flavour.

Light Roast
Light roasts spend the least time in the roaster.

The beans stay dense.
They keep more of their original character.

Flavours are brighter.
Sometimes citrusy.
Sometimes floral.
Sometimes tea-like.

Because they’re roasted for a shorter time, light roasts keep slightly more caffeine than darker roasts.

Light to Medium Roasts

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Medium Roast
Medium roasts are the most popular coffees for a reason.

They offer a wide range of flavours.
Sweetness.
Balance.
Depth.

They don’t hit too sharp.
They don’t feel heavy.
They don’t bring on that jittery sensation some people get from very light or very dark coffees.

They’re approachable.
Reliable.
Easy to come back to.

Dark Roast
Dark roasts spend the longest time in the roaster.

The beans expand.
They lose moisture.
They lose some mass.

That longer roasting time also means some caffeine slightly fades away along the way.

Dark roasts actually contain the least caffeine of the three.

Flavour-wise, they’re bold.
Rich.
Often dark chocolatey.
Sometimes nutty.
Sometimes smoky.

That strong taste makes people think they’re getting more caffeine.
In reality, they’re getting more roast character.

Dark Roasts

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Espresso: Small, Concentrated, Immediate

A single espresso shot is about 1 oz, roughly 30 ml.
It contains around 60 to 70 mg of caffeine.

A double espresso usually lands closer to 120 to 140 mg.

But espresso isn’t about numbers.

You lift the cup.
It’s warm in your hand.
Crema floats on top, thick and soft.

The first sip touches your lips gently.
Silky.
Then the body follows.
Smooth but firm.
Fresh bread aroma.
A light bitterness.
Dark chocolate lingering in the mouth.

You drink it quickly.
That’s why it feels clear and present.
Focused.
Direct.

Moka Pot: Stove-Top Power

Moka pot coffee sits somewhere between espresso and drip.

A typical moka pot serving, about 60 to 90 ml, contains roughly 90 to 120 mg of caffeine, depending on the size and coffee used.

The pressure isn’t as high as an espresso machine, but it’s stronger than drip.
The flavour is bold.
Intense.
Rich.

It’s a favourite in a lot of households for a reason.

Moka Pot Cappuccino Hack
If you want a great cappuccino at home but don’t have an espresso machine with a strong steam wand, here’s a trick.

Brew your moka pot coffee.

Heat your milk separately.
Not boiling.
Just hot.

Pour the hot milk into a French press.
Put the lid on.
Pump the plunger up and down.

The pressing plate will froth the milk beautifully.

Moka pot coffee with French press foam absolutely hits the spot.
No fancy gear needed. 
A little dash of cocoa on top makes it feel far more expensive than it is.

Drip Coffee: The Everyday Cup

A standard cup of drip coffee, about 8 oz or 240 ml, usually contains 90 to 120 mg of caffeine.

Most people drink larger sizes.
A 12 oz to 16 oz drip coffee can easily land between 140 and 200 mg.

Drip coffee feels steady.
Comforting.
Familiar.

And research shows that good quality black coffee can support focus, mood, and overall energy.
It’s also rich in antioxidants and can support heart and brain health when enjoyed without loads of sugar and milk.

When the coffee tastes good on its own, you don’t need much else.

Pour Over Coffee: Clean and Clear

Pour over coffee usually falls between 120 and 180 mg of caffeine per cup, around 300 to 400 ml.

It uses a consistent grind size.
Medium-fine.
Even extraction.

Hot water moves through the coffee evenly.
Nothing rushed.

The result is clarity.
You taste where the coffee comes from.
The sweetness.
The brightness.

Pour over coffee feels lighter on the palate.
Crisp.
Defined.

The caffeine arrives gently and stays present.

French Press Coffee: Rich and Bold

French press coffee has more body because the natural oils stay in the cup.
There’s no paper filter to trap them.

That’s why it feels heavier.
Rounder.
Full.

A typical French press cup contains 100 to 150 mg of caffeine.

French press continues extracting the entire time the coffee sits in hot water.
That means the second cup often tastes stronger than the first.

Some people love that depth.
Others find it a bit intense.

That strength isn’t only caffeine.
It's an ongoing extraction.

AeroPress: Small & Flexible

AeroPress coffee usually lands around 80 to 120 mg of caffeine per cup.

You can brew it short.
You can brew it longer.
You can make it feel close to espresso or closer to drip.

The mouthfeel is smooth.
The flavour is bold but clean.

It’s easy to drink.
And easy to make another without noticing.

The Roasterie

AeroPress Colours

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Cold Brew: Smooth but Serious

Cold brew often contains 150 to 200 mg of caffeine per serving.
Sometimes more.

It’s brewed slowly.
Over many hours.
With cold water.

The flavour stays smooth.
Low acid.
Easy on the stomach.

Cold brew can taste almost like a spirit.
Especially with the right coffee.

Our Italian espresso cold brew sometimes reminds people of cognac.
Deep.
Rich.
Confusing in the best way.

The Coffee Itself Still Leads the Way

Brew style plays a role.
Roast plays a role.
Cup size plays a role.

But fresh, well-roasted coffee changes everything.

A great French press with fresh beans can taste incredible.
Far better than a stale espresso from an expensive machine.

Good coffee delivers caffeine in a smoother, more enjoyable way.

Coffee in Calgary Feels Different

Here in Calgary, coffee follows the weather.

Cold mornings call for warmth.
Then a Chinook rolls in.

One warm afternoon.
The air shifts.
Energy drops.
People feel off.

That’s when iced coffee shows up.
Cold brew.
Iced americanos.
Something refreshing to match the mood.

And when spring teases us early, that soft clink of ice in an iced latte makes it feel real.

In Kensington, coffee isn’t just a drink.
It’s part of the neighbourhood rhythm.

We roast on site.
Small batches.
Every day.

So, How Much Caffeine Is in Your Cup?

It depends on what you choose.
How big it is.
How it’s brewed.
How fresh the coffee is.

But now you’ve got the full picture.

If you’re ever unsure what fits your day best, ask.
We’ll talk it through.
Cup in hand.

That’s how coffee should be.
Simple.
Thoughtful.
And worth drinking.

Tanzania Peaberry coffee beans.

theroasterie.com

Tanzania

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