Or how about just how many Grande Caffe Lattes you could chug before heading for that big Starbucks in the sky?
Well now you can find out the answer thanks to an amazing online tool developed by energfiend.com called Death by Caffeine.
The addictive tool allows you to punch in your weight and then flip through a huge list of coffee, soda and energy drinks and discover just how injurious to health they are.
And for the record, for an 180lb man it's 81 Starbucks Caffe Lattes!
Try it for yourself here http://www.energyfiend.com/death-by-caffeine