According to Mayo Clinic, even the caffeine in coffee from the same coffee shop can be different, if the coffee beans are roasted differently Similarly, this study based on the USDA database about caffeine content shows how caffeine amount can vary in a cup of coffee based on different factors The analyzed result of the survey about the amount of caffeine in an 8ounce cupBrewed coffee's caffeine content starts at approximately 95mg per 8ounce cup and goes up from there Surprisingly, coffee made from lighter roasts contain slightly more caffeine than darker roasts Lighter roasted beans are a bit denser than beans that have been roasted for longer at higher temperaturesThe average amount of caffeine in a cup is 1075mg French press French press coffee has about mg of caffeine with an average of 1075mg Instant coffee It will have between 27 and173 mg of caffeine in an 8ounce cup This also goes for decaffeinated instant coffee Generally, instant coffee has less caffeine than brewed coffee This
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