I've calculated it all out in the past and tried it. Personally, I didn't feel the same effect from Coffee, Tea, or Sugar Free Energy drink as I did from taking an equivalent amount of Vivran (caffeine tablet). The tab seems to hit harder w/less and have more appetite supression and thermogenesis... could be power of suggestion but it's how I felt... Just my 0.02
Now if your stim sensitive, drinking it maybe the way to go.