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How Much Caffeine Is in Dunkin' Coffee? Every Drink and Size
Dunkin' caffeine by drink and size: a medium hot coffee has about 210 mg, a medium iced coffee 297 mg and a large iced 396 mg. Full tables and the strongest orders.
The short answer
- A medium (14 oz) Dunkin' hot coffee has about 210 mg of caffeine. Small 150 mg, large 300 mg, extra large 359 mg.
- Iced coffee is stronger because the cups are bigger: 297 mg in a medium (24 oz) and 396 mg in a large (32 oz).
- A Dunkin' espresso shot has about 118 mg, so a medium latte has 166 mg and a medium Americano 284 mg.
- Medium cold brew 260 mg, medium Refresher 99 mg, medium decaf 10 mg.
Dunkin' has a reputation as the lighter, friendlier coffee stop, but Dunkin' caffeine numbers are not small. A medium hot coffee has about 210 mg, more than two 8 oz cups brewed at home. And because Dunkin' iced sizes are much bigger than hot sizes, a large iced coffee carries about 396 mg, essentially a whole day's limit in one cup.
Here is how much caffeine is in Dunkin' coffee, drink by drink and size by size, using the same values as the Caffeine vs Water drink catalog. Dunkin' gives its caffeine figures as approximate, and brewing varies by store, so treat these as good estimates.
Dunkin' sizes in oz and ml
| Size | Hot | Iced / cold |
|---|---|---|
| Small | 10 oz / 296 ml | 16 oz / 473 ml |
| Medium | 14 oz / 414 ml | 24 oz / 710 ml |
| Large | 20 oz / 591 ml | 32 oz / 946 ml |
| Extra large | 24 oz / 710 ml | n/a |
A medium iced is the same volume as an extra-large hot. Keep that in mind when you compare "a medium" across the two menus.
Dunkin' hot coffee caffeine by size
| Drink | Small | Medium | Large | XL |
|---|---|---|---|---|
| Original Blend hot coffee | 150 mg | 210 mg | 300 mg | 359 mg |
| Dark Roast | 164 mg | 235 mg | ||
| Decaf | 7 mg | 10 mg | 15 mg |
As at Starbucks, the darker roast has less caffeine, not more. A medium Dark Roast has about 46 mg less than a medium Original Blend. Flavor shots and swirls don't change the caffeine; they only add sugar and flavor.
Dunkin' itself describes its hot coffee as ranging from roughly 180 mg for a small to 330 mg for an extra large. Figures differ a little between sources because recipes, brewers and cup fill vary. Either way, the extra large lands close to the 400 mg daily ceiling.
Dunkin' iced coffee and cold brew caffeine
| Drink | Small 16 oz | Medium 24 oz | Large 32 oz |
|---|---|---|---|
| Iced coffee | 198 mg | 297 mg | 396 mg |
| Cold brew | 174 mg | 260 mg | 347 mg |
| Frozen coffee | 295 mg |
Unusually, Dunkin' iced coffee has more caffeine than its cold brew at every size. Iced coffee is brewed strong to stand up to the ice, and the cups are large. At most chains cold brew is the stronger option; at Dunkin' it's the reverse. For the wider comparison, see cold brew vs iced coffee caffeine.
Dunkin' espresso drinks: lattes, cappuccinos, Americanos
A Dunkin' espresso shot is strong, at about 118 mg, and that shapes every espresso drink on the menu.
| Drink | Small | Medium | Large |
|---|---|---|---|
| Espresso, single shot | 118 mg | ||
| Latte | 118 mg | 166 mg | 252 mg |
| Cappuccino | 118 mg | 166 mg | 252 mg |
| Macchiato | 284 mg | ||
| Americano | 237 mg | 284 mg | 371 mg |
A Dunkin' small latte has more caffeine than a Starbucks Tall latte (about 75 mg), and a medium Americano has more than a medium hot coffee. If you want a milder Dunkin' order, a small latte is the one to pick. The Starbucks numbers are in Starbucks caffeine by drink and size.
Refreshers, chai, matcha and bottled Dunkin'
| Drink | Size | Caffeine |
|---|---|---|
| Dunkin' Refresher | Small 16 oz / 473 ml | 66 mg |
| Dunkin' Refresher | Medium 24 oz / 710 ml | 99 mg |
| Dunkin' Refresher | Large 32 oz / 946 ml | 132 mg |
| Chai latte | Small / Medium / Large | 54 / 80 / 107 mg |
| Matcha latte | Medium 14 oz / 414 ml | 120 mg |
| Bottled Iced Coffee, Original | 13.7 oz / 405 ml | 197 mg |
| Bottled Iced Coffee, Mocha or Caramel | 13.7 oz / 405 ml | 150 mg |
| Original Blend K-Cup | 8 oz / 237 ml | 120 mg |
Refreshers get their caffeine from green tea. A large Refresher has about as much as a medium latte, which surprises people who order it as the "light" option. A Dunkin' matcha latte is also stronger than it sounds, at about 120 mg.
The strongest and weakest Dunkin' orders
| Most caffeine | Caffeine | Least caffeine | Caffeine |
|---|---|---|---|
| Large iced coffee | 396 mg | Small decaf | 7 mg |
| Large Americano | 371 mg | Medium decaf | 10 mg |
| Extra large hot coffee | 359 mg | Small chai latte | 54 mg |
| Large cold brew | 347 mg | Small Refresher | 66 mg |
| Large hot coffee | 300 mg | Small latte | 118 mg |
How long a Dunkin' coffee keeps you up
With a typical 5.5-hour half-life, a medium hot coffee (210 mg) takes about 11.5 hours to fall under 50 mg, the level most sleep research treats as low enough not to matter. A medium iced coffee (297 mg) takes about 14.5 hours, and a large iced (396 mg) about 16.5 hours. A 2023 meta-analysis of 24 studies found caffeine cut total sleep by about 45 minutes on average, and recommended stopping a regular coffee at least 8.8 hours before bed.
Show as a table
| Half-life | 1 h | 3 h | 6 h | 9 h | 12 h | 24 h |
|---|---|---|---|---|---|---|
| 4 h | 181 | 130 | 77 | 46 | 27 | 3 |
| 5.5 h | 188 | 148 | 102 | 70 | 48 | 11 |
| 7.5 h | 192 | 163 | 123 | 93 | 71 | 23 |
mg of active caffeine, hours after one 210 mg drink.
In practice, a medium iced coffee at noon still leaves about 85 mg at 10 pm for a typical adult. Try your own drink and bedtime in the caffeine bedtime calculator, or see the cutoff table in when to stop drinking coffee before bed.
Dunkin' decaf caffeine
Dunkin' decaf has about 7 mg in a small, 10 mg in a medium and 15 mg in a large. That's low enough that an afternoon decaf is very unlikely to matter at bedtime. It's not zero, though, so if you're counting closely, see how much caffeine is in decaf coffee. In Caffeine vs Water, swapping a Dunkin' medium for its decaf version is one tap from the warning screen.
Comparing chains? See Tim Hortons caffeine by size, Costa Coffee caffeine by size.
Frequently asked questions
How much caffeine is in a medium Dunkin' coffee?
A medium (14 oz) Dunkin' hot coffee has about 210 mg of caffeine. A medium iced coffee is bigger (24 oz) and has about 297 mg.
How much caffeine is in a large Dunkin' iced coffee?
About 396 mg in a 32 oz large. That is roughly the entire 400 mg daily amount the FDA considers generally safe for healthy adults.
Does Dunkin' cold brew have more caffeine than iced coffee?
No. At Dunkin', iced coffee has more caffeine than cold brew at every size: a medium iced coffee has about 297 mg and a medium cold brew about 260 mg.
How much caffeine is in a Dunkin' espresso shot?
About 118 mg per shot, which is stronger than many chains. A small latte has about 118 mg, a medium 166 mg and a large 252 mg.
Does Dunkin' have more caffeine than Starbucks?
For brewed coffee, usually not size for size: a 16 oz Starbucks Pike Place has about 310 mg, while a 14 oz Dunkin' medium has about 210 mg. For espresso drinks, Dunkin' is stronger: a small Dunkin' latte has about 118 mg versus about 75 mg for a Starbucks Tall latte.
How much caffeine is in a Dunkin' Refresher?
About 66 mg in a small, 99 mg in a medium and 132 mg in a large. The caffeine comes from green tea.
Sources
- Dunkin'. Dunkin' Answers Your Top Coffee Questions (approximate caffeine per cup).
- Gardiner C, et al. The effect of caffeine on subsequent sleep: a systematic review and meta-analysis. Sleep Med Rev, 2023.
- U.S. FDA. Spilling the Beans: How Much Caffeine is Too Much?
- Mayo Clinic. Caffeine content for coffee, tea, soda and more.
- Brand nutrition pages and caffeine databases, as compiled for the Caffeine vs Water drink catalog (September 2026).
General wellness information, not medical advice. If you're pregnant, have a heart condition, or take medication that affects caffeine, check your limits with a doctor.