Lol yes, 1.5 mgs i a full half mg more. In a perfect world 1.5 mgs of whatever substance your refering to is 1/3x more potent or 33% more han 1 mgs. Im confused as to why u asked, did you expect 1.5 mgs to be equal to 1 mg?
Sorry, but this is the possibly the dumbest question I've ever seen, I hope you are joking. You shouldn't be doing drugs if you don't know basic 5 year old math.