Minimum strength of pipe for load bearing

[Frostfire]

Hello, I am working on a project and I came across a question that is a little beyond my skill set.

I am designing a support for a roof, and I have the force into the post, the length of the post and I need to determine what pipe I need, size, schedule diamter, etc.

How do I go about this? I can find tables but I don't know what I am to compare it to

 

[Studiot]

Pipe size for a roof support column?