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How much caffeine is in chocolate?
7 mg
For two squares of dark chocolate, or 14 g, according to EUFIC. That is little — an espresso holds ten times more. But it is the subject where published figures vary most, up to sevenfold, for want of a common unit.
Why the figures vary
Three things explain the mess of figures you will find elsewhere.
Nobody uses the same portion. This is the main source of confusion. English-language sources measure in ounces (28 g), EUFIC in 14 g portions, some sites per 100 g bar, others « per square » without saying what a square weighs. A square runs from 5 to 12 g depending on the brand. At identical content, the published figure can therefore vary sevenfold.
The cocoa percentage. This is the only real physiological factor. Caffeine comes from the bean: more cocoa means more caffeine. A 90 % chocolate holds roughly twice as much as a 55 %.
Theobromine, mistaken for caffeine. Chocolate holds far more theobromine than caffeine — about ten times more. It produces most of the stimulant effect people feel, gentler and longer. Sources quoting very high figures sometimes add the two molecules without saying so.
Brought back to one unit
| Size | Volume | Caffeine |
|---|---|---|
| 1 square of dark (10 g) | 70 % cocoa | 5 mg |
| 2 squares of dark (14 g) | 70 % cocoa | 7 mg |
| Whole bar (100 g) | 70 % cocoa | 50 mg |
| 2 squares of milk chocolate | 14 g | 2 mg |
| Hot chocolate (200 ml) | cocoa powder | 10 mg |
Figures from EUFIC, the European food information body, brought back to comparable portions. A 90 % cocoa chocolate rises to about 9 mg for two squares.
A whole bar of dark chocolate is therefore about 50 mg — two thirds of an espresso. Far from negligible if eaten in the evening, but far from the alarming figures one sometimes reads.
Chocolate or coffee: the real gap
Two squares of dark chocolate hold eleven times less caffeine than an espresso.
You would need to eat one and a half bars to match a single espresso. Chocolate is not a significant source of caffeine — except in large amounts, and except for very sensitive people.
| Drink | Volume | Caffeine |
|---|---|---|
| 2 squares of dark chocolate | 14 g | 7 mg |
| Whole dark chocolate bar | 100 g | 50 mg |
| Espresso | 30 ml | 77 mg |
| Green tea | 240 ml | 30 mg |
If evening chocolate keeps you awake, caffeine is probably not the only culprit: theobromine, ten times more abundant, acts longer and more gently. It is a stimulant in its own right, and caffeine tables never count it.
And at bedtime, how much is left?
Two squares of dark chocolate at 9 pm leave about 6 mg at bedtime. Negligible for almost everyone.
The maths change with quantity: a whole bar in front of a film is 50 mg, half a late coffee. On top of that comes theobromine, whose effect outlasts caffeine's.
The caffeine at bedtime calculator runs this for every drink of your day.
Frequently asked
Does milk chocolate contain caffeine?
Yes, but very little: about 2 mg for two squares, against 7 for dark. Caffeine comes from cocoa, and milk chocolate holds far less of it. White chocolate, which contains no cocoa solids, has virtually none.
Why do figures vary so much between sites?
Because almost nobody states the portion. English-language sources measure in 28 g ounces, EUFIC in 14 g portions, others per 100 g bar or « per square » without saying what a square weighs. At identical content the published gap can reach sevenfold.
Is theobromine the same as caffeine?
No, they are two different molecules from the same family. Chocolate holds about ten times more theobromine than caffeine. Its stimulant effect is gentler, slower and longer. It appears in no caffeine table, which is why chocolate feels more stimulating than its figures suggest.
Can chocolate keep you awake?
In large amounts and late, possibly, but rarely from caffeine alone. Two squares bring 7 mg, the equivalent of a splash of decaf. A whole bar brings 50 mg plus theobromine, and that can matter for a sensitive person.
Is cocoa powder more concentrated?
Yes, markedly: about 72 mg of caffeine per 30 g of pure cocoa, against 15 mg for the same mass of dark chocolate. Logical, since it contains neither sugar nor added cocoa butter.
Other drinks
⚕️ Wellbeing information. The figures on this page are typical orders of magnitude, not individual measurements. They are not medical advice or a diagnosis. If you have questions about your intake, trouble sleeping, or any concern about pregnancy or medical treatment, speak to a healthcare professional.
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