How do i tell my dad im gay?

I'm sure he'll understand it.It's not your fault to be ,right?It's irreversible.You can't divert being to straight.Just make sure he's in the good mood and take it slowly.Give him a clue about your being then say what you wanna say.Don't be afraid.I think he'll understand it because he's a guy.You and your father have the same personality and likes.