u/Acceptable-Sky-3985

I've looked around on reddit so I can see a variation of this question has been asked many times before, but I haven't seen my particular question. I make coffee at home with a drip coffeemaker. Is there any way to estimate how much caffeine is in 8 oz of the coffee that comes out? I obviously know the brand of beans I use, and how much grounds I put to how much water, but all the caffeine charts I see are about bottled beverages or things like Starbucks. Does light roast vs dark roast make a difference?