Hello, can someone explain how 440 came about and why its the standard today. I would also like to know how it relates to certain intervals and harmonics etc.

Greatings, Johny Stix.
if you just google your own thread title you will find a wikipedia entry explaining just that at the top of the list...
Quote by jazz_rock_feel
I guess that's arguable, but those arguments always seemed to be laced with bullshit.

what forum do you think we're on?
modes are a social construct
As was already mentioned, the Wikipedia article already provides some history of the standard.

Quote by Hydra150

In this article, pitch standards are confused with (relative) tuning systems. It should be clear that retuning a 12-edo instrument to a different reference pitch, regardless of its prime factorization, will not achieve Pythagorean intonation (12-edo is fairly close to that as it is).