How much caffeine is in Dunkin' Frozen Coffee?

A Medium (24 fl oz) Dunkin' Frozen Coffee has 295 mg of caffeine.

That's about 3 cups of brewed coffee, and three quarters of the 400 mg a day the FDA cites for most healthy adults.

Source: Center for Science in the Public Interest · checked 10 Nov 2026

When did you have it?

Had at 3 pm, about 104 mg is still in you at an 11 pm bedtime. That will probably keep you up.

Bedtime

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Latest time to drink it

For an 11 pm bedtime, most people should finish a Medium (24 fl oz) Dunkin' Frozen Coffee by about 9:40 am. 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	Too much for one evening	7:40 am	12:40 pm
10 pm	Too much for one evening	8:40 am	1:40 pm
11 pm	Too much for one evening	9:40 am	2:40 pm
Midnight	5:40 am	10:40 am	3:40 pm
1 am	6:40 am	11:40 am	4:40 pm

For a Medium (24 fl oz) Dunkin' Frozen Coffee, 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 Medium (24 fl oz) Dunkin' Frozen Coffee peaks in your blood about 75 minutes after you start it, at roughly 252 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	207 mg	137 mg	90 mg	60 mg

So one had at 3 pm leaves about 104 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

Dunkin' Frozen Coffee is stronger than 97% of the 90 coffee-shop drinks we track, by caffeine per serving.

Per fluid ounce (12 mg) it is stronger than 81% of them.

To reach 400 mg in a day you would need about 1½ of these.

Less caffeine

Starbucks Nitro Cold Brew 280 mg, Grande
Starbucks Vanilla Sweet Cream Nitro Cold Brew 265 mg, Grande
Starbucks Iced Brown Sugar Oatmilk Shaken Espresso 255 mg, Grande

More caffeine

Starbucks Blonde Roast 315 to 390 mg, Grande
Starbucks Dark Roast 315 to 390 mg, Grande
Starbucks Pike Place Roast 315 to 390 mg, Grande

FAQ

Is Dunkin' Frozen Coffee high in caffeine?

Yes, very. A Medium (24 fl oz) Dunkin' Frozen Coffee has 295 mg, which is 3.1 times an 8 fl oz cup of brewed coffee (95 mg).

Can I drink Dunkin' Frozen Coffee at night?

Not if you want to sleep well. Had at 7 pm, it leaves about 180 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 9:40 am.

How long does the caffeine in Dunkin' Frozen Coffee last?

It peaks about 75 minutes after you start it. Of the 295 mg, about 137 mg is still in you 6 hours later and 60 mg after 12 hours, for an average adult with a 5-hour half-life.

Does Dunkin' Frozen Coffee have more caffeine than Red Bull?

Yes. A Medium (24 fl oz) Dunkin' Frozen Coffee has 295 mg; an 8.4 fl oz can of Red Bull has 80 mg.

Method and limits

The caffeine figure comes from Center for Science in the Public Interest; 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. If you are pregnant, ask your doctor; common guidance is under 200 mg a day.