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I read everyone's answer and did some of my own research to find an estimation method that satisfies me and might be helpful to others too. I think it should be roughly ±20% accurate.
For any amount of "good strength" American-style coffee by any brew method, weigh the dry coffee in grams and multiply by 0.008, or 80mg of caffeine for each 10g of dry coffee....
17
Estimation is all well and good, but if you really want to know exactly how much caffeine is in your cup, you're going to have to measure it!
Basic Mode
You can get caffeine testing strips that you can dip into coffee, and they'll give you an idea of how much caffeine is in the brew.
D+Caff is one brand I found but there may be others. They look like this:...
15
In general, darker, arabica roasts have less caffeine. Arabica (as opposed to robusta) inherently has less caffeine in it naturally, and darker coffees have less caffeine since they have been roasted longer or at higher temperatures, essentially "burning" the caffeine out of the bean.
EDIT
For some science, Arabica is usually found to be about 1.2% ...
15
Aeropress coffee (hearby called Aerpresso in this post) is more concentrated than regular drip coffee. However, if you are using similar amounts of grounds as you would in a drip machine, you shouldn't notice any difference. Caffeine is highly soluble in hot water and most any extraction method utilizing hot water will result in nearly full extraction of ...
13
Well I am not sure how thay did it but here is the website about the amount of caffeine there is in certain cups of coffee (types will vary): Caffeine In Coffee
There will be caffeine intake of other drinks as well.
Well here is another website where it explains the amount of coffee per type (not brands). It was made by ICO, the International Coffee ...
12
We have yet to invent a process that removes 100% of the caffeine. When drinking decaf, the important question to consider is how likely you are to feel the effects of the trace amounts of caffeine that are left. That brings us, as most things do, back to the beans.
Arabica has (on average) only half of the caffeine that Robusta contains. Now let's say you ...
12
Without considering the amount or potency of the coffee as well as setting personal metabolism aside, you could adjust your coffee schedule according to your natural circadian rhythm, a methodology neuroscientist Steve Miller refers to as chronopharmacology. Essentially, you use the caffeine as a propellant to your natural "up" rhythm. Gabrielle Taylor's ...
11
Determine what kind of coffee you are working with. Different kinds of coffee have different amounts of caffeine. USDA-accredited values are:
Normal - 40 mg
Decaffeinated - 1 mg
Espresso - 212 mg
Decaffeinated espresso - 1 mg
Instant - 3,142 mg
Instant chicory - 21 mg
Instant french - 246 mg
Instant mocha - 360 mg
Sourced from Google which pulls its data ...
11
The first thing you want to do is choose the right bean and the right roast.
Longer roasting removes some of the caffeine from the bean, so a lighter roast would be preferred. Additionally you should chose Robusta beans, since their inherent caffeine content is higher than that of arabica beans.
The next step is the grinding. The smaller you grind, the ...
11
To say which of these has the most caffeine is a little bit complex, as it depends on if you mean how much caffeine per ounce vs. how much caffeine in the drink in its entirety. To start, let's explain the drinks.
1. Espresso
Espresso is the key to this whole discussion. Each of the four beverages you referenced is (or contains) Espresso. Espresso is a ...
11
According to this review published in Psychopharmacology, it is very much not a myth.
The caffeine-withdrawal syndrome has been well characterized and there
is sufficient empirical evidence to warrant inclusion of caffeine
withdrawal as a disorder in the DSM and revision of diagnostic
criteria in the ICD.
More explicitly (emphasis my own):
Of 49 ...
10
According to caffeineinformer, there is 77 mg of caffeine in 1½ shots of espresso.
Comparatively, an 8 oz. cup of brewed coffee comes in at 163 mg of caffeine.
There is roughly 1/2 as much caffeine in 1.5 shots as there is in 8 oz. of brewed coffee.
10
Yes. Coffee grounds are simply the ground up seeds found inside the berry of the coffea plant, so eat up! Even after the beans have been ground and extracted into your favorite coffee beverage, they still contain plenty of caffeine and are perfectly digestible.
Before people learned to brew coffee, folks were eating the beans to get that coffee boost. ...
10
No. Coffee is often offered to people perhaps about to pass out so that they will stay awake long enough that they can be kicked out of an establishment.
Alcohol causes dehydration, electrolyte imbalance and taxes the liver. To this extent standard medical treatment is fluid, electrolytes, and vitamins. Caffeine is never used in a medical setting to ...
9
A hangover is the body reacting to being poisoned. Coffee, like any other liquid you might drink, will help with the dehydration. If your drunkenness has caused you to sleep in, and you normally drink coffee every morning, your headache may be worsened or partially caused by caffeine withdrawal, so a cup of coffee will improve that. And if you're feeling ...
9
Lets's do some Espresso math:
Taking an espresso12 as base unit, we can conclude:
A ristretto3 uses less (typically: half as much) water than an espresso for the same amount of grounds. This means the amount of water for one serving will flow through them faster, meaning less caffeine can be extracted. (But a ristretto is quite aromatic as mostly the ...
9
Caffeine does not break down (at any appreciable rate) when left alone in a drink. It requires the enzymes in your body to break it down, so when you take the drink out of the fridge, it'll be just as caffeinated as when you put it in.
However, your drink will still be stale, because there are plenty of other organic compounds in the coffee that will break ...
9
Caffeine is quite stable, it doesn’t evaporate or break down at room temperature (or coffee temperature), apart from dissolving in the water used to brew your coffee. So after an hour or two, the caffeine content is the same1 as right after brewing.
Unfortunately, the same is not true for some of the other substances that have us appreciate coffee, so you ...
8
As an avid composter I can say that I have always used lots of coffee grounds and my compost has always done well with it. There are a few reasons why it is beneficial:
used grounds are fairly pH neutral. If your compost is too acidic they even help a little by absorbing extra acid. Unused grounds however would add to acidity.
coffee grounds are considered "...
8
Caffeinated beverages like coffee and soft drinks give short bursts of energy, but can actually cause fluid loss. Caffeine has been shown to temporarily raise blood pressure, and reduces blood flow to inactive limbs.
Like many drugs, caffeine is chemically addictive and recent publication of Diagnostic and Statistical Manual of Mental Disorders (DSM), ...
8
I kicked it by switching to caffeine pills so that I could carefully taper down. Before I started the process, though, I went to caffeineinformer to get a good estimate of my daily habit. I then used caffeine pills to replace the milligrams of caffeine I was having as coffee. From there, I began to cut the pills into quarters and slowly reduce my intake over ...
8
Similar questions have been answered in Coffee SE several times. So please check these previous questions first. I'm enlisting the most related ones I can think of below:
How many cups of coffee is it safe to consume per day?
What are the side effects of drinking too much coffee?
Can drinking coffee at least once a day increase anxiety?
Coffee on daily ...
8
The beverage you make by diluting vending machine "espresso" with hot water is called "poor imitation of Americano". It is hard to say how much caffeine it contains because it's not clear what this particular vending machine is filled with. It would also be wrong to speculate on its health effects without this knowledge and without knowing whether in general ...
7
What you experienced was a caffeine overdose, however mild, and that's something that you shouldn't really try home remedies to correct. Had you gone to the emergency room, you probably could have expected to been given a laxative, activated charcoal, and possibly I.V. fluids. I doubt that they would have pumped your stomach over a single cup, but they might ...
7
This seems to suggest that there is approximately 7mg of caffeine per coated bean. I've no idea how much those weight per piece, or how many are in a bag, but the math should be fairly easy if you have access to such things.
I found another manufacturer of a similar product which claims 40g for 28 pieces. Extrapolating that for your 150g bags gives roughly ...
7
There are a few factors at play here. The temperature that the coffee is brewed at and how well the flask holds that temperature are primary.
While the coffee stays hot the caffeine level will decrease. The speed will depend on the temperature and the amount of caffeine to start with (which is thoroughly discussed in other questions here).
When the coffee ...
7
Coffee beans contain a chemical called cafestol, which tends to increase blood cholesterol levels, especially LDL ("bad") cholesterol.
Brewing with a paper filter seems to reduce the levels of these cholesterol-raising chemicals in brewed coffee by filtering out these chemicals (e.g., cafestol, kahweol). Levels of cafestol in coffee are higher in non-paper-...
7
According to Wikipedia:
Decaffeinated drinks contain typically 1–2% of the original caffeine content, and sometimes as much as 20%
[Decaffeination] is repeated from 8 to 12 times until the caffeine content meets the required standard (97% of caffeine removed according to the international standard, or 99.9% caffeine-free by mass as per the EU standard)....
7
Different people react to chemicals and stimulants in slightly different manners. It's entirely possible that the raise in blood pressure caused by caffeine may be exaggerated in some individuals (especially those who are caffeine naive) and cause headaches.
On the other hand, caffeine may reduce or prevent headaches in other individuals through several ...
7
I'm aware of one in vitro study (though there might be others) of that demonstrate that caffeine is effective at certain types of hair loss -- in a "test tube", anyway. That is, this study from 2007 (another link from publisher, a colloquial summary of the study) took biopsy samples of follicles from men with AGA ("male pattern baldness") and treated them ...
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