Cold brew is now a staple at both Starbucks and Dunkin, but the two chains brew it differently and the numbers behind each cup don't line up the way most people assume. Below is the math caffeine per size, calories, sugar, brewing method, taste, and price so you can pick the right one for your goal.
Quick Answer: Which Is Stronger?
A medium Dunkin cold brew (24 oz) delivers roughly 260 mg of caffeine, while a Grande Starbucks cold brew (16 oz) lands around 205 mg. Per fluid ounce, Starbucks is denser; per cup, Dunkin's larger serving wins on total caffeine.
Side-by-Side Comparison
| Metric | Starbucks Cold Brew (Grande, 16 oz) | Dunkin Cold Brew (Medium, 24 oz) |
|---|---|---|
| Calories | 5 | 5 |
| Sugar | 0 g | 0 g |
| Caffeine | ~205 mg | ~260 mg |
| Caffeine per oz | ~12.8 mg | ~10.8 mg |
| Brew time | ~20 hours | ~12 hours |
| Price (US avg) | ~$4.45 | ~$3.65 |
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Both default cold brews are essentially calorie-free and zero-sugar before any milk, syrup, or cold foam is added.
Brewing Method: Where the Flavor Difference Comes From
Starbucks Cold Brew
Starbucks uses a proprietary house blend of coarse-ground coffee steeped in cool, filtered water for about 20 hours. The long, low-temperature extraction produces a chocolatey, smooth, slightly sweet base with very low acidity.
Dunkin Cold Brew
Dunkin's cold brew uses a 100% Arabica blend steeped for roughly 12 hours. The shorter extraction produces a brighter, smoother, less bitter cup, but with somewhat less chocolate-forward depth than Starbucks.
Bottom line on taste: Starbucks reads as fuller-bodied and richer; Dunkin reads as smoother and more drinkable. Neither is "better", they're solving for different palates.
Caffeine Reality Check
The "Dunkin has more caffeine" claim is true at the cup level but slightly misleading. Per ounce, Starbucks is more caffeinated:
- Starbucks Grande (16 oz): ~205 mg = ~12.8 mg per oz
- Dunkin Medium (24 oz): ~260 mg = ~10.8 mg per oz
- Starbucks Venti (24 oz): ~310 mg
If you size up at Starbucks (Venti, 24 oz), you actually beat Dunkin's medium on caffeine. The size differences explain most of the perceived "stronger coffee" claims either direction.
For the FDA's general safety reference, healthy adults can consume up to 400 mg of caffeine per day. See the FDA caffeine guidance for full detail.
How Customizations Change the Math
Both default cups are 5 calories. The damage happens with add-ins.
At Starbucks
- Vanilla Sweet Cream Cold Brew (Grande): ~110 cal, 14 g sugar
- Salted Caramel Cream Cold Brew (Grande): ~220 cal, 27 g sugar
- Cold Brew + 2 pumps classic syrup: ~40 cal, 10 g sugar
- Cold Brew + splash of 2% milk: ~10 cal, 0 g added sugar
At Dunkin
- Sweet Cold Foam Cold Brew (Medium): ~140 cal, 22 g sugar
- Salted Caramel Cold Brew (Medium): ~240 cal, 39 g sugar
- Cold Brew + 1 cream + 2 sugars: ~70 cal, 15 g sugar
- Cold Brew + skim milk splash: ~5 cal, 0 g added sugar
Lowest-calorie protein-aware order at either chain: ask for a splash of nonfat or skim milk. Adds ~1–2 g protein for almost no calories.
Price: Cup-for-Cup
Average US pricing (varies by market):
- Starbucks Grande Cold Brew: ~$4.45
- Dunkin Medium Cold Brew: ~$3.65
- Per fluid oz: Starbucks ~$0.28/oz, Dunkin ~$0.15/oz
Dunkin is roughly 45% cheaper per ounce of cold brew. Over a 5-day-a-week habit, that is around $200 a year in cold-brew alone.
Which Cold Brew Should You Pick?
Pick Starbucks Cold Brew if:
- You want a richer, chocolatey flavor profile
- You like deeper customization (Sweet Cream, foam variants, syrup options)
- You want higher caffeine density per ounce
- Soy or almond milk consistency matters to you (more reliable at Starbucks)
Pick Dunkin Cold Brew if:
- You want a smoother, brighter, less bitter cup
- You want more total caffeine per cup at the standard medium
- Price matters, meaningful savings per ounce
- You prefer a faster ordering experience
For overall protein and macro comparisons between the two chains, see our Dunkin vs Starbucks protein drinks breakdown. To customize your exact order calorie-by-calorie, use the Starbucks Calorie Calculator or Dunkin Calorie Calculator.
Health Considerations
Cold brew's lower acidity (compared with hot drip coffee) makes it easier on sensitive stomachs and tooth enamel. Both chains' default cold brew is:
- Sugar-free (until customized)
- Essentially calorie-free
- Higher in caffeine than most regular hot brews of the same size
- Suitable for keto, low-carb, and most weight-loss plans (when ordered black or with minimal milk)
If you are tracking caffeine for sleep reasons, remember caffeine has a roughly 5-hour half-life. A Dunkin medium cold brew at 2 PM still has ~130 mg active in your system at 7 PM.
Sources & References
- Starbucks Menu & Nutrition. Official cold brew nutrition and caffeine
- Dunkin' Menu & Nutrition. Official cold brew nutrition and caffeine
- FDA: Caffeine Guidance. Daily caffeine safety reference
- Mayo Clinic: Caffeine Content. Independent caffeine reference data
