The task has been undertaken before, but it’s actually possible to come up with slightly different numbers.
Of course, the truth is that all of those numbers are a bit deceiving.
Adjusting box office totals for inflation, especially on a global scale, is a tricky business, as you also need to adjust for inflation, as well as exchange rates, between multiple countries over decades.
Here is one estimate for the top 10 grossing films where inflation has been taken into consideration.