Chappie's debut at the top is during the worst grossing weekends of the year so far in America, and the worst since late last year.
Chappie makes a debut gross of $13.3 million over the weekend which does't put it in good stead to have a long stay on the box office.
Falling to number 2 this week is Focus with a $10 million second weekend and $34.6 million gross after 10 days of release.
Also new on the US box office this week are sequel movie The Second Best Exotic Marigold Hotel which enters at number 3 and Unfinished Business which makes its debut at number 10.
