Starbucks
How much caffeine is in Starbucks Iced Coffee?
Data checked against the source on 2026-10-03 by Oleksii Y.
One Grande, 16 fl oz of Starbucks Iced Coffee has 185 mg of caffeine, according to Starbucks Coffee Company.
How Starbucks Iced Coffee compares
- Strength: 39 mg per 100 ml.
- One Grande, 16 fl oz has as much caffeine as about 2 cups of brewed coffee, which has 94.8 mg per 8 fl oz cup.
How much will be left at bedtime?
1 × Grande, 16 fl oz of Starbucks Iced Coffee
Left at 11:00 PM (8 h later), average metabolism
≈ 61 mg
Range 29–93 mg (fast to slow metabolism)
To be at 50 mg or less by bedtime, have 185 mg by 12:49 PM (average) or 7:09 AM (slow metabolism).
What sleep studies found near this dose
- Gardiner et al. 2023 (meta-analysis): To avoid losing sleep time, the authors suggest a coffee (107 mg per 250 ml) at least 8.8 hours before bed.
- Gardiner et al. 2023 (meta-analysis): For a pre-workout serving (217.5 mg), the authors suggest at least 13.2 hours before bed.
Estimate from a simple model: half-life of 3, 5 or 8 hours, 50 mg bedtime target. How we calculate
Caffeine by size
| Serving | Caffeine |
|---|---|
| Grande, 16 fl oz | 185 mg |
| Tall, 12 fl oz | 135 mg |
| Venti, 24 fl oz | 265 mg |
| Trenta, 30 fl oz | 320 mg |
How long does Starbucks Iced Coffee stay in your system?
Our model halves caffeine every 5 hours for average metabolism, and every 3 or 8 hours for fast or slow metabolism. From one Grande, 16 fl oz of Starbucks Iced Coffee (185 mg), about 93 mg is still in your body 5 hours later and about 46 mg after 10 hours. If you clear caffeine slowly (an 8-hour half-life), about 78 mg is left after 10 hours.
Estimated caffeine left at 11:00 PM from one Grande, 16 fl oz (185 mg), using a half-life of 5 hours for average metabolism and 3 to 8 hours for the range. How we calculate
| Had at | Left at bedtime (average) | Range |
|---|---|---|
| 8:00 AM (15 h before bed) | ≈ 23 mg | 6–50 mg |
| 12:00 PM (11 h before bed) | ≈ 40 mg | 15–71 mg |
| 3:00 PM (8 h before bed) | ≈ 61 mg | 29–93 mg |
| 6:00 PM (5 h before bed) | ≈ 93 mg | 58–120 mg |
How many fit in a day?
Reference amounts are for caffeine from all sources combined. Counted at the upper end of the stated amount, one serving at a time:
- Up to 400 mg a day for most healthy adults (FDA, EFSA): about 2 servings.
- Up to 200 mg at one time for healthy adults (EFSA): about 1 serving in one go.
- Up to 200 mg a day in pregnancy (EFSA, NHS): about 1 serving.
These are reference amounts for groups of people, not a personal limit. Some people feel jittery or sleep worse on much less. See the cutoff calculator for timing.
Good to know
A Grande Starbucks Iced Coffee lists 130 mg less caffeine than a Grande hot Pike Place Roast (315 mg).
Starbucks Iced Coffee vs other Starbucks cold coffee drinks
- Starbucks Cold Brew: Starbucks Iced Coffee has less caffeine than Starbucks Cold Brew per Grande, 16 fl oz: 185 mg vs 205 mg.
- Starbucks Nitro Cold Brew: Starbucks Iced Coffee has less caffeine than Starbucks Nitro Cold Brew per Grande, 16 fl oz: 185 mg vs 280 mg.
- Starbucks Nitro Cold Brew Black Unsweet (can): Starbucks Iced Coffee has less caffeine than Starbucks Nitro Cold Brew Black Unsweet (can) per 100 ml (39 vs 55 mg). Starbucks Iced Coffee: 185 mg per Grande, 16 fl oz; Starbucks Nitro Cold Brew Black Unsweet (can): 155 mg per 9.6 fl oz can (284 ml). Per serving the order flips, because the servings differ in size.
Common questions
How much caffeine is in Starbucks Iced Coffee?
Starbucks Coffee Company gives 185 mg of caffeine per Grande, 16 fl oz. Other sizes are in the table on this page.
How many Starbucks Iced Coffee servings can I have in a day?
The FDA and EFSA cite up to 400 mg of caffeine a day, from all sources combined, for most healthy adults. At 185 mg per Grande, 16 fl oz, that is about 2 servings if Starbucks Iced Coffee is your only source. In pregnancy the reference is 200 mg a day.
How late can I drink Starbucks Iced Coffee?
With an 11:00 PM bedtime, our model suggests having one serving by about 12:49 PM for average metabolism, or 7:09 AM if you clear caffeine slowly. This is an estimate, not a rule.
Does Starbucks Iced Coffee have more caffeine than Starbucks Cold Brew?
Starbucks Iced Coffee has less caffeine than Starbucks Cold Brew per Grande, 16 fl oz: 185 mg vs 205 mg.
How long does Starbucks Iced Coffee stay in your system?
Of the 185 mg in one Grande, 16 fl oz, roughly 93 mg remains after 5 hours and 46 mg after 10 hours with our average 5-hour half-life. From fast to slow metabolism, 10 hours later it is between 18 and 78 mg.
Where the number comes from
- Iced Coffee. Starbucks Coffee Company. Nutrition "Caffeine" field for each size (Tall 135, Grande 185, Venti 265, Trenta 320 mg); page data from /apiproxy/v1/ordering/2123863/iced. Accessed 2026-10-02. Source ↗
- Pike Place Roast (brewed coffee). Starbucks Coffee Company. Nutrition "Caffeine" field for each size (Short 155, Tall 235, Grande 315, Venti 390 mg; "Caffeine Range" maximum 195, 290, 390, 490 mg; footnote "** Caffeine is an approximate value."); page data from /apiproxy/v1/ordering/480/hot. Accessed 2026-10-02. Source ↗
Recipes and labels change. If a number here no longer matches the label, the label wins.
General information, not medical advice
If you feel unwell after caffeine — for example chest pain, a fast or irregular heartbeat that does not settle, fainting, confusion or trouble breathing — get urgent medical help. If you are pregnant or breastfeeding, under 18, take medication, or have a heart, liver or anxiety condition, high blood pressure or a sleep disorder, ask a doctor or pharmacist what amount is right for you.
Sources
- U.S. Food and Drug Administration (2024). Spilling the Beans: How Much Caffeine is Too Much? FDA Consumer Updates. fda.gov ↗
- European Food Safety Authority. Caffeine | EFSA. EFSA topic page (summary of the 2015 Scientific Opinion on the safety of caffeine). efsa.europa.eu ↗
- NHS. Foods to avoid in pregnancy. NHS. nhs.uk ↗
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