Here at Coffee Detective we don’t get too excited about the exact amount of caffeine in coffee.
We just know that drinking two or three cups in the morning gives us a nice lift, sharpens the concentration and prepare us for the day.
However, for some people the minutiae of caffeine content is a subject of fascination.
So we did our usual sleuthing and found some information you might find interesting.
Here is the breakdown of caffeine in coffee, based on drinking a 7 oz cup of coffee, with variations depending on the method of preparation etc.
And here is the source of the data: Bunker and McWilliams in J.Am. Diet. 74:28-32, 1979
Drip Coffee 115-175mg
Espresso - 1 serving (1.5-2oz) 100mg
Decaf, brewed 3-4mg
Decaf, instant 2-3mg
The amount of caffeine in coffee is also influenced by the bean itself...
The variation in caffeine content between different types of coffee beans is minor, but quite interesting nevertheless.
The figures represent the percentage of caffeine content in the bean.
Brazil Bourbons 1.20%
Celebes Kalossi 1.22
Colombia Excelso 1.37
Colombia Supremo 1.37
Costa Rica Tarrazu 1.35
Ethiopian Harrar-Moka 1.13
Guatemala Antigua 1.32
Indian Mysore 1.37
Jamaican Blue Mtn/Wallensford Estate 1.24
Java Estate Kuyumas 1.20
Kenya AA 1.36
Kona Extra Prime 1.32
Mexico Pluma Altura 1.17
Mocha Mattari (Yemen) 1.01
New Guinea 1.30
Panama Organic 1.34
Sumatra Mandheling-Lintong 1.30
Tanzania Peaberry 1.42
Blends and Dark Roasts
Colombia Supremo Dark 1.37%
Espresso Roast 1.32
French Roast 1.22
Vienna Roast 1.27
Source: Newsletter--Mountanos Bros. Coffee Co., San Francisco
So...if you really want to either maximize or minimize the amout of caffeine you ingest, you can do that both by how you brew your coffee, and through your choice of the coffee beans themselves.