Don’t expect there to be much of a difference…
All other things being equal, a light roast is going to have more caffeine in it than a dark roast.
Nate Steiner (altered) / Via commons.wikimedia.org
That's because the process of roasting beans causes some of the caffeine to escape.
Darker roasts take longer and use higher temperatures than light roasts. Both factors can cause caffeine loss.
D Dinneen / Via commons.wikimedia.org
The difference isn't super large, though. One study comparing unroasted and severely roasted beans showed only a 5.4% difference in caffeine content.
Alex Kasprak for BuzzFeed / Via HomePixel / Thinkstock
The grind, the method of brewing, and the environment where the beans were grown all affect caffeine levels too.
Tested / Via youtube.com
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