How much caffeine is in a coffee? The real numbers

An espresso of around 60 ml carries roughly 80 mg of caffeine. A 200 ml cup of filter coffee lands near 90 mg. Those are EFSA reference values — the European Food Safety Authority — and they give you an order of magnitude, not a reading of the cup in front of you. EFSA itself says all these figures are approximate, because caffeine content varies within a country and between countries.

If you want the practical version: count on 80 to 90 mg for a normal coffee, 50 mg for a cup of black tea, 80 mg for a can of energy drink and 40 mg for a can of cola. Everything after that is detail — but it is the detail that explains why your coffee at home may not match the one you buy at a café.

Why two identical coffees can contain different amounts of caffeine

The caffeine concentration in coffee depends on the manufacturing process, the type of bean used and the method of preparation — filter, espresso, moka pot, French press. That is what EFSA says, and it is why no single number fits every cup.

Look at what that means in practice. An espresso is served in a short dose, about 60 ml, and EFSA gives roughly 80 mg of caffeine for that dose. Filter coffee comes in a larger cup, and the caffeine content depends on the manufacturing process, the bean type and the preparation method. Two drinks that look completely different can carry caffeine amounts that vary with the manufacturing process, the bean type and the preparation method. The reverse is also true: two espressos pulled on the same machine, from beans of different origins, do not have to match.

Then there is a variable the brewing itself introduces: the type of preparation, whether filter coffee or espresso. Caffeine content varies with the type of preparation, such as filter coffee or espresso. This is the part of coffee that will never be standardised, and it is worth accepting rather than chasing a precise number that does not exist.

The figures you keep seeing: 80 mg, 90 mg and that 113 to 247 mg range

Two sets of public numbers circulate and appear to contradict each other. They do not: they measure different things.

EFSA works with typical European servings — 80 mg for a 60 ml espresso, 90 mg for a 200 ml filter coffee. The FDA in the United States cites 113 to 247 mg for a 350 ml serving of ordinary filter coffee, and notes that the amount in specific products and packaging varies. The difference in serving sizes helps frame the values, but EFSA points out that all the figures are approximate, because caffeine content and serving sizes vary within and between countries.

What this should tell you is simple. If you drink a small coffee, you are probably in the region of 80 mg. If you drink a mug of filter coffee, the caffeine amount may vary with the manufacturing process, the bean type and the preparation method.

Espresso, filter, decaf: what to expect from each

According to EFSA, an espresso (60 ml) has about 80 mg of caffeine — an approximate value, because caffeine content and serving sizes vary. Caffeine concentration depends on the manufacturing process, the bean type and the preparation method, such as filter coffee or espresso.

EFSA puts a 200 ml filter coffee at around 90 mg of caffeine, while a 60 ml espresso is around 80 mg — approximate values, because caffeine content and servings vary.

Decaf is not caffeine-free. The FDA states that decaffeinated coffee typically contains 2 to 15 mg per 240 ml cup. That is little — but those milligrams add up over a day. If you are avoiding caffeine on medical advice, "decaf" does not mean zero.

For comparison, EFSA gives about 50 mg for a 220 ml cup of black tea, 40 mg for a 355 ml can of cola and 80 mg for a 250 ml can of energy drink. Black tea, often seen as the gentle option, supplies around 50 mg of caffeine per 220 ml cup — an approximate figure EFSA presents for comparison only.

How much caffeine is too much, and for whom

EFSA concluded that intakes up to 400 mg per day, spread across the day, do not raise safety concerns for healthy adults in the general population — with the exception of pregnant women. For single doses, the reference limit is 200 mg. In other words: EFSA indicates that a 60 ml espresso has about 80 mg of caffeine, and that all these values are approximate, because caffeine content and serving sizes vary.

There is one effect of coffee worth knowing. EFSA indicates that single doses of 100 mg of caffeine may affect the duration and pattern of sleep in some adults, especially when consumed close to bedtime. According to EFSA, an espresso (60 ml) has about 80 mg of caffeine — approximate values, because caffeine content and servings vary. If you sleep badly and drink a coffee at five in the afternoon, you have a candidate worth testing before you go looking for more complicated causes.

Sensitivity varies a great deal from person to person, and the FDA adds that certain health conditions and medications make people more sensitive. For pregnant and breastfeeding women, EFSA concluded that up to 200 mg of caffeine per day, from all sources, does not raise safety concerns for the foetus; if you are trying to conceive, speak to your doctor. If you are in one of those situations, or you take medication and are unsure whether it interacts, the right conversation is with your doctor or pharmacist — not with a table on the internet.

How to know how much you are drinking, without counting milligrams

You will not achieve precision. You can achieve consistency, and that solves most of the problem.

• Count cups, not milligrams. Fix a mental reference — 80 mg per small coffee — and multiply.
• Note the size. Caffeine content varies with the type of coffee and the preparation method, so it is worth noticing the size of the cup or mug you use.
• Include what does not look like coffee: black tea, colas, energy drinks, chocolate, caffeine-containing supplements.
• Look at the time of your last dose, not just the daily total.

For two weeks, the most useful experiment is simple: keep the number of coffees the same and change only the time of the last one. If your sleep improves, you have learned something about yourself that no table could tell you.

The mistakes that wreck the calculation

The first is assuming the preparation method does not influence caffeine — EFSA indicates that concentrations depend on the manufacturing process, the bean type and the preparation method, such as filter coffee or espresso. We have already seen that it does. The second is treating decaf as zero — but the FDA states that decaffeinated coffee is not caffeine-free, at about 2 to 15 milligrams per 8 fluid ounce cup. The third is forgetting the sources that do not come in a cup.

Some mistakes matter less than you think. Caffeine content depends on the manufacturing process, the bean type and the preparation method, such as filter coffee or espresso; the stated amounts are therefore approximate. Worrying about the origin of the bean while drinking half a litre at ten at night is optimising the wrong thing.

If it is still not working after two or three weeks

Caffeine may affect the duration and pattern of sleep in some adults, especially when consumed close to bedtime, but sensitivity to caffeine varies a great deal from person to person. At that point, it is worth stopping the tinkering with your drink and speaking to a healthcare professional. The same applies if tiredness is the reason you drink so much coffee: it is worth speaking to a healthcare professional, who can assess what is going on with you.

We do not, at present, have data that would let us say which cause is most likely in your case. To say otherwise would be to invent it.

Where a supplement fits into this conversation

It comes in late, and it comes in small. If you already track your daily total and the time of your last dose, and you want an alternative to the fifth cup, a product with caffeine in a fixed, known dose is an option. Energy Gummies with Guarana provide 44 mg of caffeine per serving of two gummies, alongside L-Theanine, L-Tyrosine, vitamins B6, B12 and C. They are for adults, you chew two a day preferably after a meal, and you should not exceed the recommended daily dose.

Two honest points about this. The first: 44 mg is about half the 80 mg that EFSA gives, approximately, for a 60 ml espresso — it is not a bomb, and that is precisely why it may be useful as a partial replacement, not as a top-up on everything you already drink. The second: the gummies contain caffeine and are not recommended for children, pregnant or breastfeeding women; they contain polyols, whose excessive consumption may have a laxative effect. And, like any supplement, they are not a substitute for a varied and balanced diet or a healthy lifestyle. In case of illness or use of medication, consult a healthcare professional before consuming.

We are not going to promise you it solves tiredness. A supplement with caffeine delivers caffeine; what you do with it depends on what you drink, when you drink it and how you sleep.

What to do next

Pick one thing only, this week: count your cups and note the real size. No app, no scales — a piece of paper on the fridge door will do. After seven days you will have a better estimate than any generic table, because it will be about your cup and not about the European average.

If after three weeks nothing has changed, or if you have a health condition, are pregnant or breastfeeding, or take regular medication, the answer stops being in this article. The 400 mg per day and 200 mg per single dose are references for healthy adults in general; your situation may have other limits, and the person who knows them is your doctor or pharmacist.