With any amount of water I will be consuming the 120 mg (1% of 12g) of caffeine So if I eat that scoop of beans or grind them finely and drink them Once and am not comparing light or dark roasts which will vary in weight One scoop ofīeans weighs about 12 grams (yes I tared the scoop, but I did only weigh I use a 2 Tbsp scoop to measure beans before I grind them. If you have a health concern like wanting to stay under the 300 mg guideline for pregnant women, you should be able to use this as the upper limit: each 10g of Arabica coffee contains about 100mg of caffeine. Though Robusta (less common and usually blended with Arabica in cheaper coffees) has Typical premium roasted Arabica coffee beans like mine contain close to 1% caffeine by mass when measured by spectrophotometer (p 311) 100% Robusta beans (uncommon) could be about double the caffeine.Įxplanation below: Maximum caffeine content These numbers are for typical 100% Arabica or mostly Arabica blends. Weakly extracted coffee might yield 0.6% of its weight in caffeine and very strongly extracted coffee might get close to 1% caffeine. 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. I think it should be roughly ☒0% accurate. 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.
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