How Much Caffeine Is in a Cup of Coffee?
Quick answer: a standard 8 oz cup of drip coffee contains about 95 mg of caffeine — with a typical range of 70–140 mg depending on the beans, the dose, and how it's brewed. Espresso packs about 63 mg into a single 1 oz shot, cold brew usually lands higher per serving, and decaf sits way down at 2–7 mg.
Caffeine by brew method
| Beverage | Serving size | Typical caffeine | Typical range |
|---|---|---|---|
| Drip / pour-over coffee | 8 oz | ~95 mg | 70–140 mg |
| Espresso (single shot) | 1 oz | ~63 mg | — |
| French press | 8 oz | ~100 mg | 80–120 mg |
| Cold brew | 12–16 oz | ~195 mg | 150–240 mg |
| Instant coffee | 8 oz | ~60 mg | — |
| Decaf coffee | 8 oz | ~5 mg | 2–7 mg |
A few notes the table can't say out loud. A latte built on one shot has less caffeine than a mug of drip, even though espresso is the most concentrated thing on the list — serving size does the heavy lifting. French press climbs thanks to the long steep, cold brew climbs because it combines a big dose with a 12+ hour extraction, and decaf isn't zero. Just quiet.
Caffeine by Cup Size: 8 oz, 12 oz, 16 oz, and 20 oz
Caffeine doesn't get stronger as the cup gets bigger — there's just more of it. At a fixed coffee-to-water ratio, the caffeine in your cup scales with the volume you brewed, so doubling the cup roughly doubles the dose. The figures below scale the 95 mg / 8 oz baseline straight up.
| Cup size | Typical caffeine | Typical range | What it usually is |
|---|---|---|---|
| 8 oz | ~95 mg | 70–140 mg | One standard cup — the figure most charts quote |
| 12 oz | ~140 mg | 105–210 mg | Small takeaway cup, tall mug |
| 16 oz | ~190 mg | 140–280 mg | Large mug, medium takeaway |
| 20 oz | ~240 mg | 175–350 mg | Travel mug, large takeaway |
That scaling holds up against outside numbers: the FDA puts a 12 oz cup of regular brewed coffee at 113 to 247 mg, which lands neatly inside the 12 oz row above. If you brew stronger than 1:16, shift the whole column upward — see our coffee-to-water ratio guide.
What actually changes the caffeine in your cup
Four things move the number more than anything printed on the bag:
- Dose. More coffee per ounce of water means more caffeine. Simple arithmetic, grim results.
- Brew time. Longer contact between water and grounds extracts more caffeine — one reason cold brew's 12+ hour steep hits so hard.
- Grind size. Finer grinds expose more surface area and extract faster.
- Bean species. Robusta beans carry roughly twice the caffeine of arabica — about 2.2–2.7% caffeine by weight against arabica's 1.2–1.5%. Full breakdown in our arabica vs. robusta guide. Bean Reaper roasts 100% specialty-grade arabica — smoother flavor, honest caffeine.
Coffee vs. Tea vs. Energy Drinks vs. Soda: Caffeine Compared
Coffee is the heavyweight, and it isn't close. An 8 oz cup of drip carries roughly double a cup of black tea and nearly three times a cup of green tea — and a single mug of coffee outguns a standard energy drink.
| Drink | Serving size | Typical caffeine |
|---|---|---|
| Drip coffee | 8 oz | ~95 mg |
| Cold brew | 12–16 oz | 150–240 mg |
| Espresso | 1 oz shot | ~63 mg |
| Energy drink (typical) | 8.4 oz | ~80 mg |
| Matcha | 8 oz | ~70 mg |
| Black tea | 8 oz | ~47 mg |
| Green tea | 8 oz | ~28 mg |
| Cola | 12 oz | ~34 mg |
| Decaf coffee | 8 oz | 2–7 mg |
Does dark roast have more caffeine?
Barely — this one's mostly myth. Roasting changes caffeine very little. Measured by weight, light and dark roasts are nearly identical; measured by the scoop, lighter roasts come out slightly ahead because the beans are denser. Pick your roast for flavor, not for firepower — and read our roast level guide if you're choosing.
How Long Does Caffeine Stay in Your System? (Half-Life Explained)
Caffeine's half-life in healthy adults is roughly 5 to 6 hours — the time it takes your body to clear about half of what you drank. The rest lingers, and it compounds.
Run the arithmetic on a 16 oz cup at 8 a.m., call it 190 mg. By around 1 to 2 p.m. you're still carrying about 95 mg. By dinner, roughly 50 mg. Traces are still there at bedtime, which is why a 4 p.m. cup can quietly cost you sleep even when you fall asleep fine. Practically, most of a dose is gone after four or five half-lives — call it a day.
That half-life is an average, not a promise. It runs longer during pregnancy and with some medications, and shorter in smokers; genetics play a real role too. If coffee keeps you up, the cheapest fix isn't a smaller cup — it's an earlier one.
Caffeine Limits for Pregnancy and Sensitive Drinkers
For healthy adults, the FDA cites 400 mg a day as a level generally not associated with negative effects — roughly four 8 oz cups of drip, or two to three 12 oz cups.
During pregnancy, 200 mg a day is the limit most commonly advised — about two 8 oz cups of drip, or one 16 oz mug. Sensitive drinkers, people managing anxiety or reflux, and anyone on medication that interacts with caffeine often land well below the 400 mg figure too.
This is general information, not medical advice — if caffeine matters to your health situation, check with your clinician about the right number for you. If you want the ritual without the load, Final Breath decaf runs 2–7 mg a cup.
If you're here for maximum wakefulness
Brew fresh and brew intentionally. Stale coffee doesn't just taste flat — it tempts you to over-brew it into bitterness chasing strength. If you want genuinely strong coffee, the answer is dose and freshness, not scorched grounds. Start with a fresh-roasted bag like Wake The Dead or the bright, high-energy Last Call, and see our guide to the best coffee for staying awake.
FAQ
Which brew method has the most caffeine?
Per serving, cold brew usually wins. Per ounce, espresso is the most concentrated.
How much caffeine is safe per day?
The FDA cites 400 mg a day — roughly four 8 oz cups of drip — as a level generally not associated with negative effects for healthy adults. Sensitivity varies, so listen to your body.
How long does caffeine last?
Its half-life is about 5 to 6 hours, so half of an afternoon cup is still with you at dinner.
Does decaf have caffeine?
Yes, a little — 2–7 mg per cup. Our Final Breath decaf keeps the flavor and drops the jolt.
Every Bean Reaper bag is roasted after you order and shipped fresh — because caffeine works best when the coffee is worth drinking. Shop the lineup.