THere's a production budget, but then there's also an marketing budget.
So for example with this movie, they spent, allegedly (a lot of times budgets are more than they say), $175 mill. That $150 mill doesn't count what they spend to market the movie. Let's just say they spent like $75 mill on marketing. I don't know it's just a number. Usually it's a lot more. Sometimes they spend as much to market as they do on production. So in total, including marketing they spent $250 mill.
But then you have to take into account that studios don't get 100% of the gross. Otherwise movie theaters would get next to nothing. I don't know the exact amount they get, but they do get more money on domestic gross than they do from international numbers.
And I see you asking a lot in threads about what a movie has made. You can just go to boxofficemojo.com and just look it up yourself instead of always asking
http://www.boxofficemojo.com/movies/?id=kingarthur2016.htm
If he doesn't know, he doesn't know