How much caffeine is in NOS Energy Drink?

A 16 fl oz can of NOS Energy Drink has 160 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: drinknos.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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Sizes

Size	Volume	Caffeine	mg per fl oz
16 fl oz can shown above	16 fl oz (473 ml)	160 mg	10
22 fl oz bottle	22 fl oz (651 ml)	232 mg	11

Sources: drinknos.com, USDA FoodData Central · checked 10 Nov 2026

Latest time to drink it

For an 11 pm bedtime, most people should finish a 16 fl oz can of NOS Energy Drink by about 2:05 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	7:05 am	12:05 pm	5:05 pm
10 pm	8:05 am	1:05 pm	6:05 pm
11 pm	9:05 am	2:05 pm	7:05 pm
Midnight	10:05 am	3:05 pm	8:05 pm
1 am	11:05 am	4:05 pm	9:05 pm

For a 16 fl oz can of NOS Energy Drink, 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 NOS Energy Drink peaks in your blood about 75 minutes after you start it, at roughly 137 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

NOS Energy Drink is stronger than 25% of the 41 energy drinks we track, by caffeine per serving.

Per fluid ounce (10 mg) it is stronger than 24% of them.

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

Less caffeine

Monster Zero Ultra 150 mg, 16 fl oz can
Yerba Madre Yerba Mate 150 mg, 15.5 fl oz can
Uptime Energy 142 mg, 12 fl oz bottle

More caffeine

Full Throttle 161 mg, 16 fl oz can
Rockstar Energy 161 mg, 16 fl oz can
Bloom Sparkling Energy 180 mg, 12 fl oz can

Same caffeine: IRN-BRU Energy, Monster Energy, Monster Nitro Super Dry.

FAQ

Is NOS Energy Drink high in caffeine?

Yes. A 16 fl oz can of NOS Energy Drink has 160 mg, which is 1.7 times an 8 fl oz cup of brewed coffee (95 mg).

How much caffeine is in 22 fl oz bottle of NOS Energy Drink?

A 22 fl oz bottle of NOS Energy Drink has 232 mg of caffeine, 72 mg more than a 16 fl oz can of NOS Energy Drink.

Can I drink NOS Energy Drink at night?

Not if you want to sleep well. Had at 7 pm, it leaves about 98 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 2:05 pm.

How long does the caffeine in NOS Energy Drink last?

It peaks about 75 minutes after you start it. Of the 160 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 NOS Energy Drink have more caffeine than a cup of coffee?

Yes. A 16 fl oz can of NOS Energy Drink has 160 mg; an 8 fl oz cup of coffee has 95 mg.

Method and limits

The caffeine figure comes from drinknos.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.