Which has more caffeine - espresso or drip coffee? Ounce for ounce, espresso has 2.5 times the caffeine content. Per serving, drip coffee has 3.25 times more caffeine.
Per Serving:
1 serving of drip coffee (8 oz.) contains 130 mg caffeine.
1 serving of espresso (1 oz.) contains 40 mg caffeine.
Per Ounce:
1 oz. of drip coffee contains 16.25 mg caffeine while 1 oz. of espresso contains 40 mg.
An interesting result for this is that an Americano (one espresso shot and hot water) has far less caffeine than a drip cup - 3.25 times less, contrary to the popular belief that Americanos are "stronger" than typical American coffee. Although they may taste stronger due to the fact that espresso coffee is generally roasted darker, they contain less caffeine.
Source: Center for Science in the Public Interest
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