How much caffeine is in Starbucks Iced Coffee?
A Grande (16 fl oz) Starbucks Iced Coffee has 185 mg of caffeine.
That's about 2 cups of brewed coffee, and 46% of the 400 mg a day the FDA cites for most healthy adults.
Source: starbucks.com · checked 10 Nov 2026
When did you have it?
Had at 3 pm, about 65 mg is still in you at an 11 pm bedtime. That might affect your sleep.
Your whole day, every drink, in the free CaffeineIQ check. The iPhone app is coming soon.
Sizes
| Size | Volume | Caffeine | mg per fl oz |
|---|---|---|---|
| Tall | 12 fl oz (355 ml) | 135 mg | 11 |
| Grande shown above | 16 fl oz (473 ml) | 185 mg | 12 |
| Venti | 24 fl oz (710 ml) | 265 mg | 11 |
| Trenta | 30 fl oz (887 ml) | 320 mg | 11 |
Source: starbucks.com · checked 10 Nov 2026
Latest time to drink it
For an 11 pm bedtime, most people should finish a Grande (16 fl oz) Starbucks Iced Coffee by about 1:05 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 | 6:05 am | 11:05 am | 4:05 pm |
| 10 pm | 7:05 am | 12:05 pm | 5:05 pm |
| 11 pm | 8:05 am | 1:05 pm | 6:05 pm |
| Midnight | 9:05 am | 2:05 pm | 7:05 pm |
| 1 am | 10:05 am | 3:05 pm | 8:05 pm |
For a Grande (16 fl oz) Starbucks Iced 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 Grande (16 fl oz) Starbucks Iced Coffee peaks in your blood about 75 minutes after you start it, at roughly 158 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 | 130 mg | 86 mg | 57 mg | 37 mg |
So one had at 3 pm leaves about 65 mg at 11 pm. How long caffeine lasts explains the curve.
How it compares
Starbucks Iced Coffee is stronger than 72% of the 90 coffee-shop drinks we track, by caffeine per serving.
Per fluid ounce (12 mg) it is stronger than 70% of them.
To reach 400 mg in a day you would need about 2 of these.
Less caffeine
- Starbucks Caffè Mocha 175 mg, Grande
- Starbucks Peppermint Mocha 175 mg, Grande
- Starbucks Blonde Vanilla Latte 170 mg, Grande
More caffeine
- Starbucks Chocolate Cream Cold Brew 190 mg, Grande
- Starbucks Tiramisu Velvet Cold Brew 190 mg, Grande
- Starbucks Flat White 195 mg, Grande
Same caffeine: Starbucks Pistachio Cream Cold Brew, Starbucks Pumpkin Cream Cold Brew, Starbucks Salted Caramel Cream Cold Brew.
FAQ
Is Starbucks Iced Coffee high in caffeine?
Yes. A Grande (16 fl oz) Starbucks Iced Coffee has 185 mg, which is 1.9 times an 8 fl oz cup of brewed coffee (95 mg).
How much caffeine is in a Tall Starbucks Iced Coffee?
A Tall (12 fl oz) Starbucks Iced Coffee has 135 mg of caffeine, 50 mg less than a Grande (16 fl oz) Starbucks Iced Coffee.
How much caffeine is in a Trenta Starbucks Iced Coffee?
A Trenta (30 fl oz) Starbucks Iced Coffee has 320 mg of caffeine, 135 mg more than a Grande (16 fl oz) Starbucks Iced Coffee.
Can I drink Starbucks Iced Coffee at night?
Not if you want to sleep well. Had at 7 pm, it leaves about 113 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 1:05 pm.
How long does the caffeine in Starbucks Iced Coffee last?
It peaks about 75 minutes after you start it. Of the 185 mg, about 86 mg is still in you 6 hours later and 37 mg after 12 hours, for an average adult with a 5-hour half-life.
Does Starbucks Iced Coffee have more caffeine than Red Bull?
Yes. A Grande (16 fl oz) Starbucks Iced Coffee has 185 mg; an 8.4 fl oz can of Red Bull has 80 mg.
Method and limits
The caffeine figure comes from starbucks.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.
Related
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