How much caffeine is in Monster Zero Ultra?

A 16 fl oz can of Monster Zero Ultra has 150 mg of caffeine.

That's about one and a half cups of brewed coffee, and 38% of the 400 mg a day the FDA cites for most healthy adults.

Source: monsterenergy.com · checked 10 Nov 2026

Every Ultra flavor we track lists the same 150 mg per 16 fl oz can: White (Zero Ultra), Black, Blue, Blue Hawaiian, Paradise, Rosa, Strawberry Dreams, Violet and Watermelon.

When did you have it?

Had at 3 pm, about 53 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 16 fl oz can of Monster Zero Ultra by about 2:35 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	7:35 am	12:35 pm	5:35 pm
10 pm	8:35 am	1:35 pm	6:35 pm
11 pm	9:35 am	2:35 pm	7:35 pm
Midnight	10:35 am	3:35 pm	8:35 pm
1 am	11:35 am	4:35 pm	9:35 pm

For a 16 fl oz can of Monster Zero Ultra, 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 16 fl oz can of Monster Zero Ultra peaks in your blood about 75 minutes after you start it, at roughly 128 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	105 mg	70 mg	46 mg	30 mg

So one had at 3 pm leaves about 53 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

Monster Zero Ultra is stronger than 20% of the 41 energy drinks we track, by caffeine per serving.

Per fluid ounce (9.4 mg) it is stronger than 8% of them.

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

Less caffeine

Uptime Energy 142 mg, 12 fl oz bottle
Clean Cause Yerba Mate 120 mg, 12 fl oz can
Dutch Bros Rebel Energy Drink 115 mg, Medium iced

More caffeine

IRN-BRU Energy 160 mg, 500 ml can
Monster Energy 160 mg, 16 fl oz can
Monster Nitro Super Dry 160 mg, 16 fl oz can

Same caffeine: Yerba Madre Yerba Mate.

FAQ

Is Monster Zero Ultra high in caffeine?

Yes. A 16 fl oz can of Monster Zero Ultra has 150 mg, which is 1.6 times an 8 fl oz cup of brewed coffee (95 mg).

Can I drink Monster Zero Ultra at night?

Not if you want to sleep well. Had at 7 pm, it leaves about 92 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 2:35 pm.

How long does the caffeine in Monster Zero Ultra last?

It peaks about 75 minutes after you start it. Of the 150 mg, about 70 mg is still in you 6 hours later and 30 mg after 12 hours, for an average adult with a 5-hour half-life.

Does Monster Zero Ultra have more caffeine than a cup of coffee?

Yes. A 16 fl oz can of Monster Zero Ultra has 150 mg; an 8 fl oz cup of coffee has 95 mg.

Method and limits

The caffeine figure comes from monsterenergy.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.

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