From Queera:
What is the maximum IQ a human can have?
I don’t mean the highest IQ a person has at the moment, but what is our IQ capacity?
The standard answer is something like 205, and you will never even see that in your lifetime.
There has been a lot of writing on this at genius.com from a different point of view. The man who writes that estimates that Goethe and a few others had IQ’s up to 220. That’s about the limit.
Sidis was estimated by a psychologist who examined him to have an IQ to 250–300, but I have no idea what that means.
The smartest man in the world, Christopher Langan, is said to have an IQ of 200. I don’t doubt that he’s that intelligent having seen his videos. Of course, Mr. Langan is a worthless fool in our silly society because he never “used” his IQ, right? But why did he have to? A human that intelligent ought to be fascinating merely by existing. I would love to spend some quality time with Langan although he would probably make me feel retarded. I could care less whether he “used” his talent or not. Why did he have to? Is it the law?
It gets very hard to measure very high IQ’s.
Children can have very high IQ’s because their IQ’s are measured in terms how smart they are for their age. Using that scale, childhood IQ’s of up to 400 have been calculated. Of course, once they hit 18, you start counting the scores the other way, and they can’t have much above 200.
