How Much Caffeine Is in Iced Coffee, by Size and Chain
How Much Caffeine Is in Iced Coffee, by Size and Chain
A grande (16 fl oz) Starbucks Iced Coffee has 185 mg of caffeine, less than the 315 mg in a grande hot Pike Place despite the same cup size. The USDA's average for brewed iced coffee is lower still: about 74 mg per 8 fl oz, compared to 96 mg for hot brewed coffee.
Key Takeaways
- Starbucks Iced Coffee ranges from 135 mg (Tall, 12 fl oz) to 320 mg (Trenta, 30 fl oz), with a Grande at 185 mg and a Venti at 265 mg.
- A grande iced coffee has less caffeine than a grande hot coffee at Starbucks: 185 mg vs 315 mg, even though the cup holds the same 16 fl oz.
- The USDA average for brewed iced coffee is 31 mg per 100 g, which works out to about 74 mg per standard 8 fl oz cup, vs 96 mg for hot brewed coffee.
- Dunkin does not publish caffeine for its iced coffee. Its nutrition guide (last updated September 21, 2026) has no caffeine column.
Iced coffee caffeine by size
| Drink | Size | Caffeine | mg per fl oz | Share of 400 mg |
|---|---|---|---|---|
| Starbucks Iced Coffee | Tall 12 fl oz | 135 mg | 11.2 | 34% |
| Starbucks Iced Coffee | Grande 16 fl oz | 185 mg | 11.6 | 46% |
| Starbucks Iced Coffee | Venti 24 fl oz | 265 mg | 11.0 | 66% |
| Starbucks Iced Coffee | Trenta 30 fl oz | 320 mg | 10.7 | 80% |
| Starbucks Cold Brew | Grande 16 fl oz | 205 mg | 12.8 | 51% |
| Starbucks Iced Caffè Americano | Grande 16 fl oz | 225 mg | 14.1 | 56% |
| Starbucks Iced Caffè Latte | Grande 16 fl oz | 150 mg | 9.4 | 38% |
| Starbucks Pike Place, hot (for scale) | Grande 16 fl oz | 315 mg (listed range to 390) | 19.7 | 79% |
| USDA brewed iced coffee (average) | 8 fl oz (240 g) | 74 mg | 9.3 | 19% |
| USDA brewed iced coffee (average) | 16 fl oz (480 g) | 149 mg | 9.3 | 37% |
| USDA brewed coffee, hot (average) | 8 fl oz (240 g) | 96 mg | 12.0 | 24% |
| Dunkin iced coffee | any size | not published | n/a | n/a |
| Dunkin Original Iced Coffee & Milk (bottle) | 13.7 fl oz | 197 mg (label line; page copy says 171) | 14.4 | 49% |
Source: Starbucks menu data and USDA FoodData Central, read Oct 31, 2026. mg per fl oz and % of 400 mg computed.
Why iced coffee has less caffeine than hot coffee at Starbucks
Per Starbucks' own menu, a grande Iced Coffee has 185 mg and a grande hot Pike Place 315 mg: 11.6 vs about 19.7 mg per fluid ounce. Starbucks describes its Iced Coffee as "freshly brewed ... served chilled and unsweetened over ice" but does not publish a recipe or explain the gap.
A general point helps: in a cold cup, part of the volume is ice, so fewer of the ounces are brewed coffee. The USDA averages show the same pattern: 40 mg per 100 g for hot brewed vs 31 mg per 100 g for iced.
Iced coffee vs cold brew vs iced americano
At a Starbucks grande (16 fl oz), these four iced drinks line up differently:
- Iced Coffee: 185 mg (11.6 mg/oz)
- Cold Brew: 205 mg (12.8 mg/oz)
- Iced Caffè Americano: 225 mg (14.1 mg/oz)
- Iced Caffè Latte: 150 mg (9.4 mg/oz)
Starbucks says its Cold Brew is slow-steeped in cool water for 20 hours, without touching heat; Iced Coffee is brewed hot and served over ice. Starbucks Venti iced cups are 24 fl oz (not the 20 fl oz hot Venti), so a Venti Iced Coffee (265 mg) and a Venti Cold Brew (310 mg) are both larger servings than their hot equivalents.
Chains that print no caffeine numbers
Dunkin's nutrition guide (last updated September 21, 2026) has no caffeine column, and its menu pages show calories only. If you want the caffeine in a Dunkin iced coffee, Dunkin itself will not tell you. See Dunkin caffeine content for third-party estimates and Starbucks caffeine content for the full Starbucks menu.
When a chain prints nothing, the USDA's average for brewed iced coffee (about 9.3 mg per fluid ounce) is a starting point, not that chain's actual number.
Bottled iced coffee
Dunkin's bottled Original Iced Coffee & Milk (13.7 fl oz) has conflicting numbers on a Hannaford product page. The label text reads "Caffeine Content: 197 mg per bottle" (14.4 mg per fl oz), while the marketing copy on the same page says 171 mg (12.5 mg per fl oz). The printed label line is 197 mg. Check the bottle itself if you are counting.
Homemade iced coffee: the USDA average
The USDA's FoodData Central entry for "Iced Coffee, brewed" (FDC 2710428) lists 31 mg of caffeine per 100 g. Using the USDA's portion weights (30 g per fl oz):
| Size | Weight | Caffeine |
|---|---|---|
| 1 fl oz | 30 g | 9.3 mg |
| 8 fl oz (1 cup) | 240 g | 74 mg |
| 12 fl oz (small) | 360 g | 112 mg |
| 16 fl oz (medium) | 480 g | 149 mg |
| 20 fl oz (large) | 600 g | 186 mg |
For comparison, USDA "Coffee, brewed" (hot) is 40 mg per 100 g, or 96 mg per 8 fl oz cup. Quick formula: grams of iced coffee x 0.31 = approximate mg of caffeine. At home, strength depends mostly on how much ground coffee you use. Roast level changes caffeine less than most people assume.
How many iced coffees is too many?
The FDA cites 400 mg of caffeine a day as an amount not generally associated with negative effects for most adults. A Trenta Starbucks Iced Coffee is 320 mg, which is 80% of that figure in a single cup. A Venti Cold Brew hits 310 mg.
Toxic effects such as seizures can occur with rapid intake of around 1,200 mg, per the FDA. If you are pregnant, trying to become pregnant, or breastfeeding, the FDA recommends talking to your health care provider. For more context, see is 200 mg of caffeine a lot.
Related from Roon
- Cold brew caffeine content
- Starbucks caffeine content
- How much caffeine in a cup of coffee
- Dunkin caffeine content
Frequently Asked Questions
Does iced coffee have more caffeine than hot coffee?
At Starbucks, no. A grande Iced Coffee (185 mg) has less caffeine than a grande hot Pike Place (315 mg), and the USDA averages show the same pattern: 31 mg per 100 g for iced vs 40 mg per 100 g for hot brewed. Some of the cup is ice, so fewer ounces of brewed coffee end up in the drink.
Does ice reduce the caffeine in coffee?
Ice does not destroy or remove caffeine. It takes up space in the cup, leaving room for less liquid coffee, and dilutes the drink as it melts. The caffeine in the liquid stays there.
How much caffeine is in a Venti iced coffee?
A Starbucks Venti Iced Coffee (24 fl oz) has 265 mg of caffeine, per the Starbucks menu. That is 66% of the FDA's 400 mg daily reference for healthy adults and about 11.0 mg per fluid ounce.
Is cold brew stronger than iced coffee?
At Starbucks, slightly. A grande Cold Brew has 205 mg vs 185 mg for a grande Iced Coffee, or 12.8 vs 11.6 mg per fluid ounce. Starbucks steeps its Cold Brew in cool water for 20 hours but does not publish why its caffeine lands higher than the Iced Coffee.
How much caffeine is in decaf iced coffee?
The USDA lists "Iced Coffee, brewed, decaffeinated" at 1 mg per 100 g, or about 2.4 mg per 8 fl oz cup. Not zero, but close to it.
A Longer Lift Than a Cold Brew
A grande iced coffee delivers 185 mg of caffeine in one fast pour, and a Venti puts 265 mg in a single cup. Roon takes the opposite approach: 80 mg of caffeine (about 43% of that grande) paired with 60 mg L-theanine, 25 mg methylliberine (Dynamine), and 5 mg theacrine (TeaCrine) in a single pouch placed under the lip.
The methylliberine is the reason the 80 mg stretches. In a randomized, double-blind crossover PK study (n=12), methylliberine co-administered with caffeine extended caffeine's half-life from 7.2 to 15 hours and cut oral clearance from 41.9 to 17.1 L/hr, with no increase in peak concentration (study). That study used 100 mg methylliberine and 150 mg caffeine, roughly 4x and 1.9x what a single Roon pouch contains, so Roon's 6-to-8-hour felt window reflects the same mechanism at a lower dose, not the study's exact result. Because that caffeine lingers longer in your system, give yourself at least 8 hours between your last pouch and bedtime.
Zero nicotine, zero sugar, no cup to carry. Roon costs from $9.16 per tin on a 12-tin subscription, as little as $0.61 per pouch. Stay at or under 4 pouches a day, and count the iced coffee toward your 400 mg daily total if you have both.
Sources
- Starbucks Iced Coffee nutrition
- Starbucks Cold Brew nutrition
- Starbucks Iced Caffè Americano nutrition
- Starbucks Iced Caffè Latte nutrition
- Starbucks Pike Place Roast nutrition
- USDA FoodData Central: Iced Coffee, brewed (FDC 2710428)
- USDA FoodData Central: Coffee, brewed (FDC 2710375)
- Dunkin Nutrition Guide
- FDA: Spilling the Beans: How Much Caffeine Is Too Much?
- Journal of Exercise and Nutrition: methylliberine and caffeine pharmacokinetics study
Written by Roon Team
