Caffeine Guide
How Much Caffeine Is In Coffee?
Caffeine amounts by drink, bean, and brew, in one quick chart.
Quick answer
stat box below
How Much Caffeine Is in a Cup of Coffee?
A standard 8 ounce cup of brewed coffee has about 95 mg of caffeine. That is the number most charts quote, and it is a solid baseline for regular drip coffee. The catch is that almost nobody drinks 8 ounces. A typical mug runs 12 to 16 ounces, so a real cup of coffee often carries 140 to 190 mg.
The word “cup” is the confusing part. In coffee terms a cup is often measured at 5 to 6 ounces, which is why a coffee maker labeled 12 cups does not fill twelve mugs. Caffeine scales with the size of your pour at roughly 12 mg per ounce for brewed coffee, so a bigger drink means more caffeine. The chart below lines up the common sizes.
Treat these as averages. The exact amount shifts with the beans, the roast, and the brew method, which I break down further down the page.
| Serving | Size | Caffeine | Relative amount |
|---|---|---|---|
| Small cup | 8 oz (240 ml) | ~95 mg | |
| Standard mug | 12 oz (355 ml) | ~140 mg | |
| Large mug | 16 oz (475 ml) | ~190 mg | |
| Travel mug | 20 oz (590 ml) | ~240 mg | |
| Full pot (12 cups) | 60 oz (1.8 L) | ~700 mg |
Brewed and Drip Coffee
| Brew method | Caffeine (8 oz) | Relative amount |
|---|---|---|
| Drip / filter | ~95 mg | |
| Pour over | ~95 mg | |
| French press | ~90 mg | |
| Percolator | ~105 mg |
Brewed coffee, also called drip or filter coffee, is what most people mean by a cup of coffee. A regular 8 ounce cup holds about 95 mg of caffeine. The brewing method nudges the number a little. A percolator runs slightly stronger because the water cycles through the grounds again and again, while a French press lands a touch lower. Those gaps are small next to the size of your cup, so the pour matters more than the method.
Espresso
| Espresso | Size | Caffeine | Relative amount |
|---|---|---|---|
| Single shot | 1 oz (30 ml) | ~63 mg | |
| Double shot | 2 oz (60 ml) | ~126 mg | |
| Triple shot | 3 oz (90 ml) | ~189 mg | |
| Quad shot | 4 oz (120 ml) | ~252 mg | |
| Decaf single shot | 1 oz (30 ml) | ~8 mg |
Espresso is strong by taste but small by volume, and that trips people up. A single shot is about 1 ounce and carries roughly 63 mg of caffeine, which is actually less than a full cup of drip coffee. The reason a latte or an Americano feels strong is the number of shots, not the espresso itself. Order a double and you are at about 126 mg, which is where espresso passes a standard cup of coffee. A decaf shot still holds a small amount, around 8 mg.
Cold Brew and Nitro
Cold brew is the heavyweight. It steeps for 12 to 24 hours at a high coffee to water ratio, so it pulls more caffeine than any hot method. A 16 ounce cold brew can reach 300 mg or more, roughly double the same size of drip coffee. Nitro cold brew is the same concentrate charged with nitrogen for a creamy pour, so the caffeine is similar. Cold brew also swings more than any other format, since the strength depends on the brand, the beans, and the steep ratio. My cold brew ratio guide covers how to dial in your own.
| Drink | Size | Caffeine | Relative amount |
|---|---|---|---|
| Cold brew | 8 oz (240 ml) | ~155 mg | |
| Cold brew | 12 oz (355 ml) | ~235 mg | |
| Cold brew | 16 oz (475 ml) | ~310 mg | |
| Nitro cold brew | 16 oz (475 ml) | ~310 mg |
Latte, Cappuccino, and Milk Drinks
The milk in a latte or cappuccino adds no caffeine at all. It comes entirely from the espresso shots underneath. A small latte or a cappuccino is usually one shot, so about 63 mg, the same as a plain single espresso. The milk only changes the taste, the texture, and the size of the drink. Order a larger latte or a flat white and you are getting two shots, which puts you near 126 mg. So when a milk drink feels strong, count the shots, not the foam.
| Drink | Serving | Caffeine | Relative amount |
|---|---|---|---|
| Cappuccino | 6 oz (1 shot) | ~63 mg | |
| Latte | 12 oz (1 shot) | ~63 mg | |
| Latte, large | 16 oz (2 shots) | ~126 mg | |
| Flat white | 6 oz (2 shots) | ~126 mg | |
| Mocha | 12 oz (1 shot) | ~63 mg |
Instant Coffee
Instant coffee is milder than most people expect, around 62 mg for a standard 8 ounce cup made with one rounded teaspoon. It lands below drip coffee because you simply use less coffee per cup. Add a second spoonful and you push it up toward 120 mg. The caffeine is real, it is just tied to how much you scoop in.
| Instant coffee | Serving | Caffeine | Relative amount |
|---|---|---|---|
| Regular | 1 tsp, 8 oz | ~62 mg | |
| Strong | 2 tsp, 8 oz | ~120 mg | |
| Decaf | 1 tsp, 8 oz | ~3 mg |
Decaf Coffee
Decaf is not caffeine free, and that surprises a lot of people. Decaffeination strips out most of the caffeine, but a small amount always survives. A cup of decaf brewed coffee holds about 3 mg, and a decaf espresso shot about 8 mg. That is tiny next to a regular cup, so decaf is fine for the afternoon, but if you are extremely sensitive it is worth knowing the number is not zero. This section targets “how much caffeine in decaf coffee,” which draws 8,100 searches a month on its own.
| Decaf drink | Serving | Caffeine | Relative amount |
|---|---|---|---|
| Decaf brewed coffee | 8 oz | ~3 mg | |
| Decaf espresso | 1 shot (1 oz) | ~8 mg | |
| Decaf instant | 1 tsp, 8 oz | ~3 mg |
Caffeine in Coffee by Drink Type
Here is where the numbers spread out. Two drinks made from the same beans can carry very different caffeine, because what matters is how much coffee ends up in the cup. Espresso drinks scale with the number of shots, brewed coffee scales with size, and cold brew sits at the top. The table below lines up the common drinks, and each one is broken down in the sections that follow.
| Drink | Serving | Caffeine | Relative amount |
|---|---|---|---|
| Brewed / drip coffee | 8 oz | ~95 mg | |
| Espresso | 1 shot (1 oz) | ~63 mg | |
| Double espresso | 2 oz | ~126 mg | |
| Cappuccino | 6 oz (1 shot) | ~63 mg | |
| Latte | 12 oz (1 shot) | ~63 mg | |
| Americano | 12 oz (2 shots) | ~126 mg | |
| Instant coffee | 8 oz | ~62 mg | |
| Cold brew | 16 oz | ~310 mg | |
| Nitro cold brew | 16 oz | ~310 mg | |
| Decaf coffee | 8 oz | ~3 mg |
What Changes the Caffeine in Your Coffee?
The numbers above are averages. Four things push a given cup higher or lower, and knowing them explains why two coffees can feel so different.
| Drink | Serving | Caffeine | Relative amount |
|---|---|---|---|
| Brewed coffee | 8 oz | ~95 mg | |
| Espresso | 1 shot (1 oz) | ~63 mg | |
| Black tea | 8 oz | ~47 mg | |
| Green tea | 8 oz | ~28 mg | |
| Matcha | 1 tsp (2 g) | ~65 mg | |
| Red Bull | 8.4 oz | ~80 mg | |
| Monster | 16 oz | ~160 mg | |
| Celsius | 12 oz | ~200 mg | |
| Diet Coke | 12 oz | ~46 mg |
Bean Type (Arabica vs Robusta)
The bean matters most. Robusta beans carry nearly twice the caffeine of Arabica, roughly 2.2 percent versus 1.2 percent by weight. Most specialty coffee is Arabica for its flavor, while Robusta shows up in many espresso blends and cheaper mass-market coffee for body, crema, and a caffeine kick. A shot pulled from a Robusta-heavy blend can hit noticeably harder than one from pure Arabica.
Roast Level (the light vs dark myth)
This one is backwards in most people’s heads. Roasting does not add or destroy much caffeine, so by weight light and dark roast are about the same. The catch is how you measure. Dark roast beans are lighter and puffier because they lost moisture and mass in the roaster, so a scoop of dark roast holds fewer beans and a scoop measured by weight holds more. Scoop for scoop, light roast can edge slightly higher. The difference is small either way, and roast changes flavor far more than caffeine.
Brew Method and Time
Longer contact between water and coffee pulls out more caffeine. That is why cold brew, steeped for many hours, is so strong, and why a fast espresso shot holds less than a full cup of drip despite tasting more intense. Grind size and water temperature play smaller supporting roles, mostly by changing how fast the coffee extracts.
Serving Size
The simplest lever, and the one people forget. Caffeine rides along with volume, so a 16 ounce mug of drip coffee carries roughly twice the caffeine of an 8 ounce cup of the same brew. Before blaming the beans or the roast, check how much you actually poured.
Coffee vs Other Caffeine Sources
Coffee is not the only thing in your day with caffeine, and it helps to see where it lands against the alternatives. A cup of coffee usually beats a cup of tea, edges out most sodas, and runs close to a can of Red Bull. The one surprise for many people is that a strong energy drink like Celsius or a large Monster can carry as much caffeine as two cups of coffee. The table compares a typical serving of each, with the coffee options highlighted.
| Drink | Serving | Caffeine | Relative amount |
|---|---|---|---|
| Brewed coffee | 8 oz | ~95 mg | |
| Espresso | 1 shot (1 oz) | ~63 mg | |
| Black tea | 8 oz | ~47 mg | |
| Green tea | 8 oz | ~28 mg | |
| Matcha | 1 tsp (2 g) | ~65 mg | |
| Red Bull | 8.4 oz | ~80 mg | |
| Monster | 16 oz | ~160 mg | |
| Celsius | 12 oz | ~200 mg | |
| Diet Coke | 12 oz | ~46 mg |
Coffee vs Tea and Matcha (green tea 9,900, matcha 1,900)
Cup for cup, coffee wins. An 8 ounce coffee has about 95 mg, while black tea sits near 47 mg and green tea near 28 mg. Matcha looks like an exception, but only because you consume the whole leaf as powder. A typical teaspoon of matcha lands around 65 mg, still under a cup of coffee, though it releases more slowly for a steadier lift.
Coffee vs Energy Drinks (Celsius 5,400, Red Bull 3,600, Monster 1,900)
This is where coffee gets dethroned. A small Red Bull is about 80 mg, in cup-of-coffee territory, but a 16 ounce Monster is around 160 mg and a Celsius can reach 200 mg. Those rival two cups of coffee in a single can, usually with added sugar or sweeteners, which is worth keeping in mind if you are tracking a daily limit.
Coffee vs Soda (Diet Coke 3,600)
Soda is the mild one. A 12 ounce Diet Coke holds about 46 mg and most regular colas even less, roughly 34 to 46 mg. So a soda is closer to a cup of tea than a cup of coffee, despite the jolt people expect from it.
How Much Caffeine Is Safe per Day?
For most healthy adults, up to 400 mg of caffeine a day is considered safe, according to the U.S. Food and Drug Administration. That works out to roughly four 8 ounce cups of brewed coffee, or about two to three larger cafΓ© drinks. Go well past it and the common signs show up: jitters, a racing heart, headaches, and trouble sleeping.
Some people should aim lower. Pregnant people are usually advised to stay under 200 mg, and anyone sensitive to caffeine, on certain medications, or prone to anxiety may feel the effects at much smaller amounts. Children and teens should have very little. The 400 mg figure is a general ceiling for healthy adults, not a target to hit.
The tricky part is adding it all up across a day of coffee, tea, soda, and energy drinks. That is exactly what myΒ caffeine calculatorΒ does, tracking your running total against the 400 mg guideline.
How Long Does Caffeine Stay in Your System?
Caffeine does not leave all at once. It fades on a curve set by its half-life, which is about 5 hours for most people. So if you drink a coffee with 95 mg at 3 PM, roughly half is still active around 8 PM, and about a quarter lingers near 1 AM. That long tail is why an afternoon cup can quietly wreck your sleep even when you feel fine by dinner.
Half-life varies from about 3 to 7 hours depending on genetics, medication, pregnancy, and liver health, so the same cup clears faster for some people than others. If you want your own numbers instead of an average, the calculator below models your caffeine as it rises and falls, and shows how much is still in you at bedtime.
See how long your coffee lasts
Add your drinks, set your bedtime, and watch your caffeine rise and fade through the day.
Related Coffee Guides
FAQ
Good to Know
Caffeine in Coffee, Answered
Straight answers on how much caffeine is in coffee, espresso, decaf, and how it stacks up against tea and energy drinks.
Caffeine in Coffee
A standard 8 ounce cup of brewed coffee has about 95 mg of caffeine. Most people drink 12 to 16 ounce mugs, so a real cup often runs 140 to 190 mg. The amount rises with the size of your pour.
A single espresso shot holds about 63 mg of caffeine in roughly 1 ounce. That is less than a full cup of drip coffee, even though espresso tastes far stronger. A double shot is about 126 mg.
By concentration, yes. Espresso packs more caffeine per ounce than drip coffee. By total serving, no. A 1 ounce shot has about 63 mg while an 8 ounce cup of drip has about 95 mg. The cup wins because it is much bigger.
Cold brew is the strongest common drink. A 16 ounce cold brew can reach 300 mg or more, roughly double a same size drip coffee, because it steeps for many hours at a high coffee to water ratio. See my cold brew ratio guide.
Decaf and Instant
Yes, decaf is not caffeine free. A cup of decaf brewed coffee has about 3 mg and a decaf espresso shot about 8 mg. That is tiny next to regular coffee, but it is not zero.
Instant is usually milder. A cup made with one rounded teaspoon has about 62 mg, below the roughly 95 mg in a drip coffee, because instant uses less coffee per cup.
Coffee vs Other Drinks
Cup for cup, yes. An 8 ounce coffee has about 95 mg, black tea about 47 mg, and green tea about 28 mg. So a coffee carries roughly two to three times the caffeine of tea.
It depends on the can. A small Red Bull is about 80 mg, close to a cup of coffee. A 16 ounce Monster is about 160 mg and a Celsius can reach 200 mg, which rivals two cups of coffee in one drink.
Matcha has less caffeine than coffee but more than brewed tea. A typical teaspoon is around 65 mg, under an 8 ounce coffee at 95 mg, though matcha tends to release its caffeine more slowly.
Caffeine and Your Body
By weight they are almost the same. Measured by scoop, light roast can edge slightly higher because the beans are denser. Roast level changes flavor far more than caffeine.
For most healthy adults the FDA points to 400 mg a day as a safe ceiling, about four 8 ounce cups of coffee. Pregnant people are usually advised to stay under 200 mg, and people sensitive to caffeine should aim lower.
Caffeine has a half life of about 5 hours for most people, so half is still active 5 hours after a cup. A late cup can still affect sleep. You can model your own levels with my caffeine calculator.