How much caffeine is in Dunkin' Cold Brew (Medium)?

A Dunkin' Medium Cold Brew contains 260 mg of caffeine in a 710 ml (24 fl oz) serving.

That works out to 36.6 mg of caffeine per 100 ml—slightly less concentrated than a standard drip coffee (40 mg per 100 ml), but the large volume pushes the total dose well above a typical cup. For context, 260 mg is equivalent to about 2.7 cups of regular brewed coffee (based on 96 mg per 240 ml). After drinking, caffeine enters the bloodstream within 15 to 45 minutes and peaks around 30 to 60 minutes, producing a noticeable lift in alertness and focus that can last for several hours.

At 65% of the FDA's 400 mg daily guidance for healthy adults, this single beverage accounts for a substantial portion of the day's caffeine budget. How you experience that depends on your body weight, tolerance, and the timing of your last meal, but for most people the effects will be pronounced and prolonged.

How long Dunkin' Cold Brew (Medium) stays in your system

How long 260 mg stays in your system

Caffeine follows first-order elimination with a population-average half-life of 5.7 hours. Starting from 260 mg, the amount remaining in your body drops predictably: after 3 hours, roughly 181 mg remain (260 × 0.5^(3/5.7)); after 6 hours, about 125 mg; after 9 hours, around 87 mg; and after 12 hours, approximately 60 mg. That 12-hour mark still leaves a stimulant load comparable to a single shot of espresso (63 mg).

If you finish a Medium Cold Brew at 15:00, by 18:00 you still have 181 mg circulating—more than a Starbucks Grande Caffè Latte. By 21:00, 125 mg remains, and by midnight, 87 mg. For a 23:00 bedtime, that lingering dose can delay sleep onset and reduce deep sleep, as research shows that even 400 mg taken six hours before bed cuts total sleep by over an hour (Drake et al., 2013). Use our caffeine half-life calculator to model your own timeline.

Daily limit and bedtime considerations

With 260 mg of caffeine, a single Dunkin' Medium Cold Brew uses 65% of the FDA's 400 mg daily guidance for healthy adults. That leaves only 140 mg for the rest of the day—about one 12-oz cup of drip coffee or a small latte. Consuming two of these cold brews would push you to 520 mg, well above the recommended ceiling, and could lead to jitters, anxiety, or heart palpitations in sensitive individuals. The European Food Safety Authority (EFSA) further advises that single doses should not exceed 200 mg for most adults, a threshold this drink surpasses by 60 mg.

For sleep, timing matters. If you aim for a 23:00 bedtime, a 260 mg dose consumed at 15:00 leaves roughly 98 mg at lights-out (based on the 5.7-hour half-life). That residual is more than a shot of espresso and can significantly disrupt sleep architecture. Our latest cup before bedtime tool helps you back-calculate the safest cutoff time based on your personal sensitivity. Pregnant individuals should be especially cautious: EFSA recommends limiting total daily intake to 200 mg during pregnancy, so this single drink exceeds that entire day's allowance. Adolescents, who metabolize caffeine more slowly relative to body weight, also face higher risks; Health Canada suggests a maximum of 2.5 mg per kg of body weight, meaning a 50 kg teenager would max out at 125 mg—less than half of this cold brew. For personalized limits, see our safe daily limit by body weight calculator.

How Dunkin' Medium Cold Brew stacks up

Within the coffee-shop category, the 260 mg in this 710 ml drink sits in the upper-middle range. It delivers more total caffeine than a Starbucks Grande Cold Brew (205 mg in 473 ml), but that's largely because of the larger serving size. Ounce for ounce, Starbucks' cold brew is more concentrated (0.43 mg/ml vs. Dunkin's 0.37 mg/ml). Compared to hot brewed coffees, the difference is starker: a Starbucks Grande Pike Place Brewed packs 310 mg into just 473 ml (0.66 mg/ml), and even a Dunkin' Medium Original Blend hot coffee has 210 mg in a smaller 414 ml cup (0.51 mg/ml). So while the cold brew is not the most concentrated option, the large cup size makes it one of the higher-dose single-serving coffees available.

Against espresso-based drinks, the Medium Cold Brew holds its own. A single shot of espresso (63 mg) would need over four shots to match it; a Starbucks Grande Caffè Americano (225 mg) comes close, but still falls short. Energy drinks pale in comparison: a 473 ml can of Monster Energy delivers 160 mg, and a 250 ml Red Bull just 80 mg. This cold brew is roughly equivalent to 2.7 cups of home-brewed drip coffee, making it a substantial caffeine source that should be counted carefully in your daily total. Use our side-by-side drink comparison to weigh it against any other beverage.

What changes the number for Dunkin' Cold Brew (Medium)

What changes the caffeine content

The 260 mg figure is the value published by Dunkin' for their Medium (24 fl oz) Cold Brew. However, the actual caffeine in your cup can shift with several factors, most obviously the size. Dunkin' offers Cold Brew in Small (16 fl oz) and Large (32 fl oz) as well. Scaling linearly by volume, a Small would contain roughly 173 mg and a Large around 347 mg, though Dunkin' does not publish separate numbers for those sizes, and the coffee-to-water ratio may not be perfectly proportional. Always check the brand's latest nutrition panel for the most accurate data.

Preparation method introduces further variation. Cold brew is made by steeping coarsely ground coffee in cold water for 12 to 24 hours. A longer steep or a finer grind can increase extraction, pushing caffeine higher, while a shorter steep or a coarser grind reduces it. The coffee-to-water ratio—typically 1:4 to 1:8 by weight for cold brew concentrate, which is then diluted—also matters. Dunkin' brews a ready-to-drink cold brew, so the final concentration reflects their proprietary recipe, but small batch-to-batch differences are normal.

Bean origin and roast level play a smaller role. Arabica beans, which Dunkin' uses, generally contain less caffeine than Robusta, but the difference is modest in a finished beverage. Dark roasts lose a tiny amount of caffeine during roasting, but the effect is negligible compared to brewing variables. If you opt for a decaf version, Dunkin' offers Decaf Cold Brew; by FDA rules, decaf coffee must have at least 97% of caffeine removed, so a Medium Decaf Cold Brew would likely contain between 2 and 15 mg—a tiny fraction of the regular.

Because of these variables, any single caffeine figure for a brewed coffee is an estimate. The 260 mg we cite represents the best available data from the company and is consistent with independent lab tests of similar cold brew products. For a deeper look at how we collect and verify numbers, visit our open caffeine dataset.

Where this figure comes from

Where the 260 mg number comes from

The caffeine value for Dunkin' Medium Cold Brew is sourced from Dunkin's published nutrition information, which the company updates periodically on its website and in-store materials. We cross-reference this with data from the USDA FoodData Central and the Mayo Clinic caffeine database to ensure consistency. Because cold brew is a handcrafted beverage, slight variations occur between batches and locations; published numbers from different testing labs can differ by 5–15% due to differences in steeping time, coffee origin, and analytical methods. We treat the 260 mg figure as a representative average and update it whenever Dunkin' reformulates or releases new data. Our open dataset logs the provenance and last-verified date for every entry.

If you encounter a substantially different value on a third-party site, it may be based on older menu data or a different serving size (e.g., a 16 oz Small or a 32 oz Large). We encourage readers to check the timestamp on any caffeine claim and to consult the brand's official channels for the most current information.

Bottom line

A Dunkin' Medium Cold Brew (24 fl oz / 710 ml) delivers 260 mg of caffeine—65% of the recommended daily maximum for healthy adults and the equivalent of about 2.7 cups of regular drip coffee. Its effects peak within an hour and, due to a 5.7-hour half-life, leave roughly 60 mg still active 12 hours later, enough to disturb sleep if consumed in the afternoon. While the cold brew is less concentrated than hot coffee, the large serving size makes it one of the higher-caffeine single-serving options available. Pregnant individuals, adolescents, and anyone sensitive to caffeine should approach this drink with caution and factor it carefully into their daily total.

All figures are based on the latest available data from Dunkin' and cross-checked against public nutrition databases. Use our interactive tools to see how this dose fits your own caffeine metabolism and daily schedule.