I recently got a winter sampler pack by Sierra Nevada, which had 3 Coffee Stout beers. I've also brewed my own coffee stout for early next year. I was wondering, having tried both, they both have a decent coffee taste, but is there any home science way to find the caffeine content of a coffee beer.
FWIW my homebrew was "dry hopped" with 6 ounces of coffee grounds for two weeks, in a 5gal batch. Not sure if that can help with any calculations.
Let me know if this is off topic, and I can move it to the homebrew SE, or even maybe the chemistry or cooking stack.