How Many Coffees a Day Should You Really Be Drinking?

If caffeine didn't interfere with my sleep, I would drink beautiful coffee all day long.

There. I've said it.

Unfortunately, my body has other ideas.

I'm a two-coffee-a-day person. Almost never more than two and, if we're being completely truthful, fairly rarely less than two either.

My first is usually in the morning with a dash of nut milk. My second comes later in the morning, normally before I train. Then I'm done and dusted by about 10am.

Maybe 10:30am on the weekend if I'm feeling particularly wild and crazy.

Why?

Because I know my body.

I'm quite caffeine sensitive, I've always been prone to insomnia, and I've learnt over the years that however much I adore coffee, a third caffeinated cup isn't worth sacrificing my sleep for.

So when someone asks me, “How many coffees a day is safe to drink?”, my first answer isn't actually a number.

It's this:

How much caffeine can your body comfortably handle without affecting your sleep, your stomach, your heart rate or how you feel?

That's your starting point.

And notice I said caffeine rather than coffee.

Because they're not quite the same conversation.

It's Really About Caffeine, Not the Number of Coffees

One of the problems with saying “three coffees a day” or “four coffees a day” is that a coffee isn't a standard scientific measurement.

A small espresso, a large filter coffee, a double-shot flat white and a strong cold brew can contain very different amounts of caffeine.

The science therefore talks primarily about milligrams of caffeine, not simply cups of coffee.

The US Food and Drug Administration currently says:

“For most adults, the FDA has cited 400 milligrams a day”

as an amount not generally associated with negative effects.

But—and this bit matters enormously—the FDA immediately points out that there is considerable variation in how sensitive people are to caffeine and how quickly their bodies eliminate it.

Australian guidance is even more cautious. Food Standards Australia New Zealand says there isn't a recognised health-based guidance value equivalent to an official Acceptable Daily Intake for caffeine.

So I don't look at 400 mg and think, Excellent. That's my allowance. Better make sure I use every last milligram.

That's completely backwards.

It's a general reference point, not a target.

My Coffee Limit Is Two. Yours Might Be Four.

I've been a two-coffee person for years.

As sleep has become even more important to me, I've become increasingly strict about when I drink them.

Both are normally finished by 10am.

That doesn't mean everyone needs to copy me.

Some people can drink an espresso after dinner, go to bed and sleep like a baby.

Lucky bastards.

Other people have one strong coffee at lunchtime and are staring at the ceiling at midnight wondering why their brain has decided to revisit every conversation they've had since 1997.

Our caffeine metabolism is individual.

That's why I think your own body gives you far more useful information than somebody else's coffee routine.

How Do You Know If You're Drinking Too Much Caffeine?

Rather than counting cups obsessively, pay attention to what happens after you drink them.

Some recognised signs of excessive caffeine intake include:

• disrupted sleep or insomnia
• jitters
• anxiety
• increased heart rate or palpitations
• nausea or an unsettled stomach
• headaches

If those start happening, don't battle your body just because somebody told you four coffees a day was “safe”.

Wind it back.

Try one.

Move your last caffeinated coffee earlier.

Switch an afternoon cup to decaf.

Coffee is supposed to make your day better.

Sleep Wins. Every Time.

This is my golden rule.

Don't use afternoon coffee to compensate for consistently poor sleep and then allow that coffee to interfere with the following night's sleep.

That's a fairly miserable little circle.

I love the alertness I get from caffeine. I love a coffee before training. I love the flavour, aroma, preparation and whole ritual of making it.

But sleep is the priority.

If you're continually tired in the afternoon, another coffee may make you feel more alert for a while. It hasn't necessarily solved why you're tired.

For me, protecting sleep means a 10–10:30am caffeine cut-off.

Your cut-off might be midday.

Someone else's might be 3pm.

There isn't one magical clock time for everybody.

Find yours.

Coffee Isn't Just a Caffeine Delivery System

This is another reason I don't love talking about coffee purely in milligrams.

Coffee is a plant product containing hundreds of compounds, including polyphenols and other naturally occurring bioactive substances that continue to attract scientific interest.

Caffeine is only one component.

That's also why decaf is still coffee.

Remove most of the caffeine and you still have the flavour, aroma, ritual and many of the naturally occurring compounds found in the bean.

So if your body says, “That's enough caffeine for today,” you don't necessarily have to say goodbye to coffee.

I certainly don't.

If I want another one in the afternoon, I go decaf.

Decaf Is Not Defeat

I think people sometimes treat decaf as though they've somehow failed at coffee.

Absolutely not.

Decaf is what allows those of us who are sensitive to caffeine to keep enjoying something we love.

It's also fantastic for people who simply like an afternoon or evening coffee ritual without wanting a significant caffeine dose.

One small technical point worth knowing: decaffeinated doesn't necessarily mean completely caffeine-free. The FDA reports that decaf coffee typically still contains a small amount of caffeine.

At Kimberley Coffee Company we're particularly fond of the Swiss Water Process for decaffeination because it uses water-based processing rather than conventional chemical-solvent methods.

And if you've finished your caffeine quota for the day?

Make the decaf beautiful.

Sit down.

Enjoy it.

Your brain doesn't need a stimulant for the ritual to matter.

Two Great Coffees Beat Four Forgettable Ones

Quality over quantity, every single time.

If you grew up in Australia through the 60s, 70s, 80s or even much of the 90s, you'll probably remember a time when coffee often meant freeze-dried instant coffee from a jar.

We've come rather a long way.

Today people understand espresso extraction, single origins, blends, roast profiles, French press, cold brew and freshness in a way we simply didn't when I was younger.

Coffee has followed a journey a little like wine.

There was a time when most of us weren't discussing grape variety, region or vintage either. Then suddenly people became interested in what they were drinking.

Coffee has done the same thing.

People are even roasting beans at home.

And I love it.

I'd much rather have two beautifully made coffees using freshly roasted beans than mindlessly bang out cup after cup simply because I want caffeine.

When coffee genuinely tastes good, you slow down.

You smell it.

You taste it.

You enjoy making it.

It becomes something you're having because you want it rather than something you're consuming because you think you need it.

Freshness Matters More to Me Than Quantity

Anyone who knows Kimberley Coffee Company knows we're rather obsessive about freshness.

Coffee changes after roasting. Its volatile aroma and flavour compounds gradually change and dissipate with exposure to oxygen and time.

That's why we'd rather you drink freshly roasted beans than coffee that's spent months travelling through warehouses and sitting on supermarket shelves.

I'm not going to tell you that an older bean suddenly becomes nutritionally “dead”. That's too simplistic.

But from a coffee-lover's perspective?

Freshly roasted coffee is simply a completely different drinking experience.

And if I'm only having two caffeinated coffees today, you can be absolutely certain I want both of them to be worth having.

What About Hydration?

Yes, I want you drinking water too.

Particularly if you're active, exercising, working outdoors or living somewhere hot.

But there's another coffee myth worth correcting here.

Moderate coffee intake doesn't automatically dehydrate you.

Caffeine does have a diuretic effect, particularly at larger doses, but the water contained in a normal cup of coffee also contributes to your fluid intake.

Mayo Clinic summed this up rather neatly in 2025:

“Water is the best liquid you can drink to stay hydrated.”

Quite right.

Coffee isn't my substitute for water.

I enjoy my coffees and stay well hydrated throughout the day.

That's the balance I'd recommend.

Don't Forget Caffeine Comes From Other Places Too

Another reason counting “coffees” can be misleading is that coffee isn't the only place caffeine turns up.

Depending on your diet, caffeine can also come from:

• tea
• chocolate
• cola
• energy drinks
• pre-workout products
• some supplements
• some over-the-counter medicines

Your body doesn't award separate caffeine allowances according to where it came from.

The FDA notes that caffeine is handled by the body similarly whether it occurs naturally in coffee and tea or has been added to another product.

So if you're caffeine sensitive, think about your total intake, not only the number of coffees you've consumed.

Coffee, Caffeine and Medications

This is one area where I don't think a coffee company should pretend to be your doctor.

Some medications can interact with caffeine or affect how quickly your body processes it.

For example, medical literature has documented clinically important interactions involving medicines such as fluvoxamine and clozapine, both involving pathways associated with caffeine metabolism.

A 2025 clinical paper discussing clozapine treatment specifically included changes in caffeine intake among the factors that may alter clozapine concentrations.

That doesn't mean everyone taking medication needs to stop drinking coffee.

It means this:

If you take prescription medication regularly, particularly if you're changing your caffeine consumption substantially, ask your doctor or pharmacist whether caffeine matters for your particular medicine.

That's an easy question to ask and far better than assuming.

Pregnancy Is Another Time to Check Your Caffeine

Pregnancy changes the caffeine conversation too.

Health authorities generally recommend a lower caffeine intake during pregnancy than the guidance used for other healthy adults; European and UK guidance commonly uses 200 mg per day.

If you're pregnant, trying to conceive or breastfeeding, talk with your healthcare professional about the amount appropriate for you.

And again—decaf means you don't have to give up the entire pleasure and ritual of coffee just because you're reducing caffeine.

Don't Drink More Coffee Because Someone Told You It's Healthy

I love coffee.

Obviously.

And coffee is being studied extensively for associations with various aspects of health, with particular interest in its polyphenols and other bioactive compounds.

But I don't think that means someone who happily drinks one coffee each morning should suddenly start forcing down four.

More isn't automatically better.

Coffee isn't medication.

You don't need to “dose” yourself with it in pursuit of some theoretical health benefit.

If one beautiful coffee makes you happy and your body loves it?

Wonderful.

If you're comfortable with three?

Wonderful.

If caffeine makes you miserable but you love coffee?

Drink decaf.

My Simple Rule for How Many Coffees a Day

So, after all the research, what's my answer?

For most healthy adults, 400 mg of caffeine per day is a commonly cited upper reference point—not a target and not a guarantee that every individual will tolerate that amount.

I personally don't need anywhere near that much.

My rule is far simpler:

Drink the amount of coffee that allows you to feel good, sleep well and genuinely enjoy every cup.

Keep your water intake up.

Pay attention to caffeine from other sources.

If medication, pregnancy or a health condition applies to you, get individual advice.

And if caffeinated coffee begins disturbing your sleep, making you anxious, upsetting your stomach or giving you palpitations, listen.

Your body is giving you useful information.

For me, that's two beautiful coffees before about 10am.

After that?

Thank goodness somebody invented decaf.

Simone – The Coffee Girl
Kimberley Coffee Company

Research & Guidance Referenced

U.S. Food and Drug Administration. Spilling the Beans: How Much Caffeine is Too Much? Current guidance notes 400 mg daily as an amount not generally associated with negative effects for most healthy adults, while stressing significant individual variation.

Food Standards Australia New Zealand. Caffeine. Updated November 2025. FSANZ notes that Australia and New Zealand do not have a recognised health-based guidance value equivalent to an Acceptable Daily Intake for caffeine.

Mayo Clinic. Caffeine: Is it dehydrating or not? Updated August 2025. Moderate caffeinated drinks can contribute to fluid intake, although water remains the preferred source of hydration.

Waters K et al. Managing ciprofloxacin–clozapine interaction with therapeutic drug monitoring. 2025. The paper identifies caffeine intake among factors capable of influencing clozapine concentrations.

Kinoshita H et al. Caffeine intoxication due to drug-drug interaction. 2025. Reports an interaction involving caffeine and fluvoxamine through CYP1A2 metabolism.

Kobylińska Z et al. Coffee as a Source of Antioxidants and an Elixir of Youth. 2025. Reviews bioactive compounds in coffee including caffeine and polyphenols.

This article combines Simone's personal experience as The Coffee Girl with published scientific and health guidance. It is general information only and isn't medical advice. Individual caffeine tolerance varies, and medication, pregnancy or health concerns should be discussed with an appropriate healthcare professional.