How much caffeine is in Starbucks Protein Matcha?
A hot Grande (16 fl oz) Starbucks Protein Matcha has 75 mg of caffeine.
That's about three quarters of a cup of brewed coffee, and 19% 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 26 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) | 25 mg | 3.1 |
| Tall, hot | 12 fl oz (355 ml) | 50 mg | 4.2 |
| Tall, iced | 12 fl oz (355 ml) | 35 mg | 2.9 |
| Grande, hot shown above | 16 fl oz (473 ml) | 75 mg | 4.7 |
| Grande, iced | 16 fl oz (473 ml) | 65 mg | 4.1 |
| Venti, hot | 20 fl oz (591 ml) | 100 mg | 5.0 |
| 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 hot Grande (16 fl oz) Starbucks Protein Matcha by about 7:35 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 | 12:35 pm | 5:35 pm | Any time |
| 10 pm | 1:35 pm | 6:35 pm | Any time |
| 11 pm | 2:35 pm | 7:35 pm | Any time |
| Midnight | 3:35 pm | 8:35 pm | Any time |
| 1 am | 4:35 pm | 9:35 pm | Any time |
For a hot Grande (16 fl oz) Starbucks 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 hot Grande (16 fl oz) Starbucks Protein Matcha peaks in your blood about 75 minutes after you start it, at roughly 64 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 | 53 mg | 35 mg | 23 mg | 15 mg |
So one had at 3 pm leaves about 26 mg at 11 pm. How long caffeine lasts explains the curve.
How it compares
Starbucks Protein Matcha is stronger than 22% of the 90 coffee-shop drinks we track, by caffeine per serving.
Per fluid ounce (4.7 mg) it is stronger than 25% of them.
To reach 400 mg in a day you would need about 5½ of these.
Less caffeine
- Starbucks Caramel Protein Matcha 65 mg, Grande
- Starbucks Matcha Crème Frappuccino 65 mg, Grande
- Starbucks Matcha Latte 65 mg, Grande
More caffeine
- Smoothie King Coffee High Protein 83 mg, 20 fl oz cup
- Starbucks Banana Bread Latte 85 mg, Tall
- Starbucks Caramel Ribbon Crunch Frappuccino 85 mg, Grande
FAQ
Is Starbucks Protein Matcha high in caffeine?
It is moderate. A hot Grande (16 fl oz) Starbucks Protein Matcha has 75 mg, which is 79% of the 95 mg in an 8 fl oz cup of brewed coffee.
How much caffeine is in a Short Starbucks Protein Matcha?
A Short (8 fl oz) Starbucks Protein Matcha has 25 mg of caffeine, 50 mg less than a hot Grande (16 fl oz) Starbucks Protein Matcha.
How much caffeine is in a Venti iced Starbucks Protein Matcha?
An iced Venti (24 fl oz) Starbucks Protein Matcha has 95 mg of caffeine, 20 mg more than a hot Grande (16 fl oz) Starbucks Protein Matcha.
Can I drink Starbucks Protein Matcha at night?
Earlier is better. Had at 7 pm, it leaves about 46 mg in an average adult at an 11 pm bedtime. The latest time for an 11 pm bedtime is about 7:35 pm.
How long does the caffeine in Starbucks Protein Matcha last?
It peaks about 75 minutes after you start it. Of the 75 mg, about 35 mg is still in you 6 hours later and 15 mg after 12 hours, for an average adult with a 5-hour half-life.
Does Starbucks Protein Matcha have more caffeine than Red Bull?
No. A hot Grande (16 fl oz) Starbucks Protein Matcha has 75 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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