How much caffeine is in Coca-Cola?

A 12 fl oz can of Coca-Cola has 34 mg of caffeine.

That's about a quarter of a cup of brewed coffee, and 9% of the 400 mg a day the FDA cites for most healthy adults.

Source: coca-colacompany.com · checked 10 Nov 2026

When did you have it?

Had at 3 pm, about 12 mg is still in you at an 11 pm bedtime. That should not affect most people’s sleep.

Bedtime

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Sizes

Size	Volume	Caffeine	mg per fl oz
12 fl oz can shown above	12 fl oz (355 ml)	34 mg	2.8
16 fl oz bottle	16.2 fl oz (479 ml)	48 mg	3.0

Sources: coca-colacompany.com, USDA FoodData Central · checked 10 Nov 2026

Latest time to drink it

For an 11 pm bedtime, a 12 fl oz can of Coca-Cola 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	6:15 pm	Any time	Any time
10 pm	7:20 pm	Any time	Any time
11 pm	8:20 pm	Any time	Any time
Midnight	9:15 pm	Any time	Any time
1 am	10:15 pm	Any time	Any time

For a 12 fl oz can of Coca-Cola, 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 12 fl oz can of Coca-Cola peaks in your blood about 75 minutes after you start it, at roughly 29 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	24 mg	16 mg	10 mg	6.9 mg

So one had at 3 pm leaves about 12 mg at 11 pm. How long caffeine lasts explains the curve.

How it compares

Coca-Cola is stronger than 14% of the 15 sodas we track, by caffeine per serving.

Per fluid ounce (2.8 mg) it is stronger than 14% of them.

To reach 400 mg in a day you would need about 12 of these.

Less caffeine

Barq's Root Beer 22 mg, 12 fl oz can
Sunkist Orange Soda 19 mg, 12 fl oz can
Caffeine-Free Coca-Cola no caffeine

More caffeine

Poppi Cola 40 mg, 12 fl oz can
Dr Pepper 41 mg, 12 fl oz can
Diet Coke 46 mg, 12 fl oz can

FAQ

Is Coca-Cola high in caffeine?

It is moderate. A 12 fl oz can of Coca-Cola has 34 mg, which is 36% of the 95 mg in an 8 fl oz cup of brewed coffee.

How much caffeine is in 16 fl oz bottle of Coca-Cola?

A 16 fl oz bottle of Coca-Cola has 48 mg of caffeine, 14 mg more than a 12 fl oz can of Coca-Cola.

Can I drink Coca-Cola at night?

For most people, yes: even late in the evening a 12 fl oz can of Coca-Cola stays under 50 mg at an 11 pm bedtime.

How long does the caffeine in Coca-Cola last?

It peaks about 75 minutes after you start it. Of the 34 mg, about 16 mg is still in you 6 hours later and 6.9 mg after 12 hours, for an average adult with a 5-hour half-life.

Is there a decaf or lower-caffeine version of Coca-Cola?

Yes. Caffeine-Free Coca-Cola has no caffeine.

Does Coca-Cola have more caffeine than a cup of coffee?

No. A 12 fl oz can of Coca-Cola has 34 mg; an 8 fl oz cup of coffee has 95 mg.

Method and limits

The caffeine figure comes from coca-colacompany.com and the other sources listed above; 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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