The smartest man alive right now has an IQ of 210 and the smartest man to ever live has of 270. yet none have done anything remotely close to the level of reed richards. If you could gauge his IQ would it be over 500? 

Over 9000!

lol

IQ does not = intelligence, it a kind of test like manies others.
 
Most version out there caps around the 200 so there simply wont be any way to calculate an IQ of 500.

I could not gauge his IQ, only someone of his IQ, could create a reliable test designed to measure his IQ accurately and ethically thats unwise, it may lead to substance abuse or he might cheat. Knowing Reed he would so cheat... it would be like me making a Nemi test. I would rig it so I scored a perfect A out of 100. 

400 would be more appropriate, wouldn't it?

This is all depending on what tests one uses to measure IQ.

undefinable

@difficlus: https://i.imgur.com/nbckXFm.png

It's 267.

@crazy8504: It should be noted that's only at 16 and before he got his powers

Are you indicating that his powers (beside elastic ones) but his Super Genius mind also come/were enhanced from the Cosmic Rays? That seemed so.

On Topic: Around 400-600

Theres been plenty of times how he's shown off using his elastic powers on his brain to enhance his thought and thinking power but I dont think the rays themselves made him any smarter.

there is a mr fantastic forum?