From burgers, chicken, sandwiches, and pizza here are the most successful fast food franchises with the most worldwide sales.
Number 5 : Pizza Hut

Global Sales in 2016 : $85,002,000,000 (Billion)
Units Worldwide : 16,411
Number 4 : Subway

Global Sales in 2016 : $17,000,000,000 (Billion)
Units Worldwide : 45,936
Number 3 : Burger King

Global Sales in 2016 : $18,209,200,000 (Billion)
Units Worldwide : 15,738
Number 2 : KFC

Global Sales in 2016 : $23,193,000,000 (Billion)
Units Worldwide : 20,604
Number 1 : McDonald's

Global Sales in 2016: $85,002,000,000 (Billion)
Units Worldwide :36,899
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It would also be interesting to look at the total number of units for each company as well. For example, Subway has the most locations in the U.S. with nearly twice the number of stores as McDonald's.