Both boxers owe their status to the May 2 match that Mayweather won.
Coming in third place overall is Katy Perry, the highest-paid female celebrity with earnings of $135 million, soundly beating the influential Taylor Swift.
The top 10 women are:Musician Katy Perry, $135 million
Musician Taylor Swift, $80 millionTV personality Ellen DeGeneres, $75 million
Musician Lady Gaga, $59 million
Musician Beyonce Knowles, $54.5 million
TV Personality Kim Kardashian, $52.5 million
Actress Jennifer Lawrence, $52 million
TV Personality Judy Sheindlin (Judge Judy), $47 million
Model Gisele Bündchen, $44 million
Actress Scarlett Johansson, $35.5 million.
Swift, however, does have the distinction of being among the youngest top-earning celebrities. Swift, 25, was ranked eighth in the overall highest-paid list.
The 10 youngest celebrities on Forbes list include:
Soccer player Neymar, $31 million, age 23
Soccer player James Rodriguez, $29 million, age 23
Musician Ed Sheeran, $57 million, age 24
Actress Jennifer Lawrence, $52 million, age 24
Musician Taylor Swift, $80 million, age 25
Soccer player Gareth Bale, $35 million, age 25
Basketball player Kevin Durant, $54 million, age 26
Golfer Rory McIlroy, $48.5 million, age 26
Basketball player Derrick Rose, $34 million, age 26
F1 driver Sebastian Vettel, $33 million, age 27.
Musicians accounted for 36 of the 100 spots on the list, followed by athletes (28), actors (14), personalities (10), actresses (2), TV actresses (2), hip-hop empresarios (2), comedians (2), authors (1), magicians (1) and TV actors (1).
The top earning actress, ranked 34 overall, was Jennifer Lawrence, who took in $52 million.
As for the top 10 overall earners?
Floyd Mayweather, $300 million
Manny Pacquiao, $160 million
Katy Perry, $135 million
One Direction, $130 million
Howard Stern, $95 million
Garth Brooks, $90 million
James Patterson, $89 million
Robert Downey Jr., $80 million
Taylor Swift, $80 million
Cristiano Ronaldo, $79.5 million