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Permalink Reply by John P on January 3, 2009 at 5:17pm

Yes.

espresso has about ~ 100 mg caffeine per 1.5 to 2 ounces

8 oz. coffee has ~ 125-190 mg... increase that for typical larger sizes.

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Permalink Reply by Alun Evans on January 3, 2009 at 5:28pm

Generally the extraction process for an espresso, 25 Seconds, will mean it will have significantly less caffeine in a shot than a cup of brewed coffee (drip or French Press). Brewed coffee has far longer contact with the surface of the coffee grinds, meaning caffeine extraction should be higher. Johns numbers are about right... although espresso I would put as high as 140mg to 240mg for a 12oz mug (with lighter roasts granted)

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Permalink Reply by Joseph Robertson on January 10, 2009 at 3:42pm

This is an easy subject to get confused with depending how how you measure. I agree with both reply's above.

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Permalink Reply by Tyler Stevens on January 10, 2009 at 5:01pm

I have also found that depending on the volume of your shot there will be less caffeine. For instance a 1.5 oz. ristretto will have a considerably smaller amount of caffeine than a full 2 oz. American Standard espresso. That boost of caffeine comes in those first hints of over extraction usually after 1.6 ounces...

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