How much caffeine is in Black Forest cake?

One slice (200 g) of Black Forest cake has 12 mg of caffeine.

You would need about 8 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 4.2 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 6 mg of caffeine.

Latest time to eat it

For an 11 pm bedtime, one slice (200 g) of Black Forest 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	Any time	Any time	Any time
10 pm	Any time	Any time	Any time
11 pm	Any time	Any time	Any time
Midnight	Any time	Any time	Any time
1 am	Any time	Any time	Any time

For one slice (200 g) of Black Forest 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 slice (200 g) of Black Forest cake peaks in your blood about 75 minutes after you start it, at roughly 10 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	8.4 mg	5.6 mg	3.7 mg	2.4 mg

So one had at 3 pm leaves about 4.2 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

Black Forest cake is stronger than 39% of the 37 foods we track, by caffeine per serving.

To reach 400 mg in a day you would need about 33 of these.

Less caffeine

Chocolate Milkshake 11 mg, 1 cup
Chocolate Ice Cream 11 mg, 1 large cup
Chocolate Cake 11 mg, 1 slice

More caffeine

Chocolate Cheesecake 13 mg, 1 cup
Nestlé Crunch 13 mg, 1 bar
Chocolate Chip Cookie 14 mg, 1 extra-large bakery cookie

Same caffeine: Chocolate Donut, German Chocolate Cake, Red Velvet Cake.

FAQ

Is Black Forest cake high in caffeine?

No, it is low. One slice (200 g) of Black Forest cake has 12 mg, which is 13% of the 95 mg in an 8 fl oz cup of brewed coffee.

Can I eat Black Forest cake at night?

For most people, yes: even late in the evening one slice (200 g) of Black Forest cake stays under 50 mg at an 11 pm bedtime.

How long does the caffeine in Black Forest cake last?

It peaks about 75 minutes after you start it. Of the 12 mg, about 5.6 mg is still in you 6 hours later and 2.4 mg after 12 hours, for an average adult with a 5-hour half-life.

Does Black Forest cake have more caffeine than a cup of coffee?

No. One slice (200 g) of Black Forest cake has 12 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.