How much caffeine is in flourless chocolate cake?

One cup (120 g) of flourless chocolate cake has 30 mg of caffeine.

You would need about 3 of these to equal a cup of brewed coffee (95 mg).

Source: USDA FoodData Central · checked 10 Nov 2026

When did you have it?

Had at 3 pm, about 11 mg is still in you at an 11 pm bedtime. That should not affect most people’s sleep.

Bedtime

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Per 100 g that is about 25 mg of caffeine.

Latest time to eat it

For an 11 pm bedtime, one cup (120 g) of flourless chocolate cake stays under the 50 mg most people sleep fine with, even late in the evening. The table works it out for other bedtimes and for how sensitive you are: it is the latest time to start one so that the caffeine left stays under the line all night.

Bedtime	Very sensitive under 25 mg	Average under 50 mg	Not very sensitive under 100 mg
9 pm	7:20 pm	Any time	Any time
10 pm	8:20 pm	Any time	Any time
11 pm	9:20 pm	Any time	Any time
Midnight	10:20 pm	Any time	Any time
1 am	11:20 pm	Any time	Any time

For one cup (120 g) of flourless chocolate cake, average clearance (half-life 5 h), 8 hours of sleep. "Any time" means even one at bedtime stays under the line.

How long it lasts

The caffeine from one cup (120 g) of flourless chocolate cake peaks in your blood about 75 minutes after you start it, at roughly 26 mg. Half of it is gone in about 5 hours for an average adult; that ranges from roughly 3 to 7 hours, and longer in pregnancy or with some medicines.

Time after	3 hours	6 hours	9 hours	12 hours
Still in you	21 mg	14 mg	9.2 mg	6.1 mg

So one had at 3 pm leaves about 11 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

Flourless chocolate cake is stronger than 78% of the 37 foods we track, by caffeine per serving.

To reach 400 mg in a day you would need about 13 of these.

Less caffeine

M&M's Milk Chocolate 29 mg, 1 cup
Dark Chocolate 23 mg, 1 oz, 70-85% cacao
Chocolate Chip Muffin 20 mg, 1 large muffin

More caffeine

Coffee Ice Cream 30 to 50 mg, 2/3 cup, super-premium
Awake Caffeinated Chocolate 50 mg, 1 bite
Chocolate Syrup 58 mg, 1 cup

FAQ

Is flourless chocolate cake high in caffeine?

It is moderate. One cup (120 g) of flourless chocolate cake has 30 mg, which is 32% of the 95 mg in an 8 fl oz cup of brewed coffee.

Can I eat flourless chocolate cake at night?

For most people, yes: even late in the evening one cup (120 g) of flourless chocolate cake stays under 50 mg at an 11 pm bedtime.

How long does the caffeine in flourless chocolate cake last?

It peaks about 75 minutes after you start it. Of the 30 mg, about 14 mg is still in you 6 hours later and 6.1 mg after 12 hours, for an average adult with a 5-hour half-life.

Does flourless chocolate cake have more caffeine than a cup of coffee?

No. One cup (120 g) of flourless chocolate cake has 30 mg; an 8 fl oz cup of coffee has 95 mg.

Method and limits

The caffeine figure comes from USDA FoodData Central; recipes, brewing and batches vary, so a real serving can differ. The curves use a standard one-compartment model with an average 5-hour half-life and a sleep-friendly line of 50 mg; your own body may clear caffeine faster or slower. How it works has the details.

These are estimates for information, not medical advice.