How much caffeine is in Smoothie King Hulk Espresso?

A 20 fl oz cup of Smoothie King Hulk Espresso has 159 mg of caffeine.

That's about one and a half cups of brewed coffee, and 40% of the 400 mg a day the FDA cites for most healthy adults.

Source: smoothieking.com · checked 10 Nov 2026

When did you have it?

Had at 3 pm, about 56 mg is still in you at an 11 pm bedtime. That might affect your sleep.

Bedtime

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Latest time to drink it

For an 11 pm bedtime, most people should finish a 20 fl oz cup of Smoothie King Hulk Espresso by about 2:10 pm. 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	7:10 am	12:10 pm	5:10 pm
10 pm	8:10 am	1:10 pm	6:10 pm
11 pm	9:10 am	2:10 pm	7:10 pm
Midnight	10:10 am	3:10 pm	8:10 pm
1 am	11:10 am	4:10 pm	9:10 pm

For a 20 fl oz cup of Smoothie King Hulk Espresso, 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 a 20 fl oz cup of Smoothie King Hulk Espresso peaks in your blood about 75 minutes after you start it, at roughly 136 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	112 mg	74 mg	49 mg	32 mg

So one had at 3 pm leaves about 56 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

Smoothie King Hulk Espresso is stronger than 62% of the 90 coffee-shop drinks we track, by caffeine per serving.

Per fluid ounce (8.0 mg) it is stronger than 45% of them.

To reach 400 mg in a day you would need about 2½ of these.

Less caffeine

Starbucks Caffè Latte 150 mg, Grande
Starbucks Caffè Misto 150 mg, Grande
Starbucks Cappuccino 150 mg, Grande

More caffeine

Starbucks Dubai Chocolate Mocha 165 mg, Grande
Starbucks Blonde Vanilla Latte 170 mg, Grande
Starbucks Gingerbread Latte 170 mg, Grande

FAQ

Is Smoothie King Hulk Espresso high in caffeine?

Yes. A 20 fl oz cup of Smoothie King Hulk Espresso has 159 mg, which is 1.7 times an 8 fl oz cup of brewed coffee (95 mg).

Can I drink Smoothie King Hulk Espresso at night?

Not if you want to sleep well. Had at 7 pm, it leaves about 97 mg in an average adult at an 11 pm bedtime, above the 50 mg most people sleep fine with. The latest time for an 11 pm bedtime is about 2:10 pm.

How long does the caffeine in Smoothie King Hulk Espresso last?

It peaks about 75 minutes after you start it. Of the 159 mg, about 74 mg is still in you 6 hours later and 32 mg after 12 hours, for an average adult with a 5-hour half-life.

Does Smoothie King Hulk Espresso have more caffeine than Red Bull?

Yes. A 20 fl oz cup of Smoothie King Hulk Espresso has 159 mg; an 8.4 fl oz can of Red Bull has 80 mg.

Method and limits

The caffeine figure comes from smoothieking.com; 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.