"I have to go" = "I have (I've) got to go" = I must go "I got to go ..." should not be used on its own. An example of its use is : "I got to go on Concorde before it was scrapped". It means : "I managed to go", or "I took the opportunity to go" Some people (especially in North America) might say in informal language "I gotta go" or just "gotta go" or "got to go" e.g. when you have to end a phone call because you have something else to do. In this case, you still would not say "I got to go". Hope that helps, Michael

"I got to go" isn't really grammatically correct English, but is used colloquially I guess, shortened from "I have/I've got to go". They are both another way of saying "I must go", which is how they would be translated into other languages.

They're essentially the same, but "I got to go" is more informal.

They mean the same thing however "I have to go" would be considered more formal and more proper english than "I got to go"

I GOT TO GO is used sometimes in casual informal speech to mean the same as I HAVE TO GO (particularly in USA) ... You will be understood if you use it but it is not correct