How much caffeine is in Starbucks Caramel Protein Matcha?
A Grande (16 fl oz) Starbucks Caramel Protein Matcha has 65 mg of caffeine.
That's about three quarters of a cup of brewed coffee, and 16% 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 23 mg is still in you at an 11 pm bedtime. That should not affect most people’s 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 |
|---|---|---|---|
| Short | 8 fl oz (237 ml) | 20 mg | 2.5 |
| Tall, hot | 12 fl oz (355 ml) | 40 mg | 3.3 |
| Tall, iced | 12 fl oz (355 ml) | 35 mg | 2.9 |
| Grande shown above | 16 fl oz (473 ml) | 65 mg | 4.1 |
| Venti, hot | 20 fl oz (591 ml) | 85 mg | 4.3 |
| Venti, iced | 24 fl oz (710 ml) | 95 mg | 4.0 |
Iced and hot versions have the same caffeine except where the table lists them separately.
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 Caramel Protein Matcha by about 8:40 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 | 1:35 pm | 6:40 pm | Any time |
| 10 pm | 2:35 pm | 7:40 pm | Any time |
| 11 pm | 3:35 pm | 8:40 pm | Any time |
| Midnight | 4:35 pm | 9:40 pm | Any time |
| 1 am | 5:35 pm | 10:40 pm | Any time |
For a Grande (16 fl oz) Starbucks Caramel Protein Matcha, 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 Caramel Protein Matcha peaks in your blood about 75 minutes after you start it, at roughly 55 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 | 46 mg | 30 mg | 20 mg | 13 mg |
So one had at 3 pm leaves about 23 mg at 11 pm. How long caffeine lasts explains the curve.
How it compares
Starbucks Caramel Protein Matcha is stronger than 19% of the 90 coffee-shop drinks we track, by caffeine per serving.
Per fluid ounce (4.1 mg) it is stronger than 19% of them.
To reach 400 mg in a day you would need about 6 of these.
Less caffeine
- Starbucks Dubai Chocolate Matcha 60 mg, Grande
- Starbucks Gingerbread Chai 60 mg, Grande
- Starbucks Iced Cream Chai 60 mg, Grande
More caffeine
- Starbucks Protein Matcha 75 mg, Grande hot
- Smoothie King Coffee High Protein 83 mg, 20 fl oz cup
- Starbucks Banana Bread Latte 85 mg, Tall
Same caffeine: Starbucks Matcha Crème Frappuccino, Starbucks Matcha Latte.
FAQ
Is Starbucks Caramel Protein Matcha high in caffeine?
It is moderate. A Grande (16 fl oz) Starbucks Caramel Protein Matcha has 65 mg, which is 68% of the 95 mg in an 8 fl oz cup of brewed coffee.
How much caffeine is in a Short Starbucks Caramel Protein Matcha?
A Short (8 fl oz) Starbucks Caramel Protein Matcha has 20 mg of caffeine, 45 mg less than a Grande (16 fl oz) Starbucks Caramel Protein Matcha.
How much caffeine is in a Venti iced Starbucks Caramel Protein Matcha?
An iced Venti (24 fl oz) Starbucks Caramel Protein Matcha has 95 mg of caffeine, 30 mg more than a Grande (16 fl oz) Starbucks Caramel Protein Matcha.
Can I drink Starbucks Caramel Protein Matcha at night?
Earlier is better. Had at 7 pm, it leaves about 40 mg in an average adult at an 11 pm bedtime. The latest time for an 11 pm bedtime is about 8:40 pm.
How long does the caffeine in Starbucks Caramel Protein Matcha last?
It peaks about 75 minutes after you start it. Of the 65 mg, about 30 mg is still in you 6 hours later and 13 mg after 12 hours, for an average adult with a 5-hour half-life.
Does Starbucks Caramel Protein Matcha have more caffeine than Red Bull?
No. A Grande (16 fl oz) Starbucks Caramel Protein Matcha has 65 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.
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