McGregor is worth about $34 million, according to Forbes. The Nevada State Athletic Commission revealed Friday that Mayweather will earn a guaranteed purse of $100 million, while McGregor's minimum purse is $30 million.
But the fighters will cash in for even more than the purses. Each has a share of the promotion. McGregor is set to rake in more than $100 million from that. Mayweather should make double or triple the amount of McGregor from the promotion.
The other purses on the fight card include Gervonta Davis ($600,000), Francisco Fonseca ($35,000), Badou Jack ($750,000), Nathan Cleverly ($100,000), Andrew Tabiti ($100,000) and Steve Cunningham ($100,000).
Mayweather (49-0) is worth $340 million, according to Forbes. He will eclipse $1 billion in career earnings after Saturday's bout. Earlier this month, Mayweather told Jimmy Kimmel that he expects to make $350 million from the fight.
McGregor earned a UFC record $3 million purse in UFC 202.
Mayweather and McGregor tap gloves at 9 p.m. Saturday at T-Mobile Arena in Las Vegas. You can watch the fight at home, in high-definition, for about $100 on Showtime pay-per-view.
"Money" is currently money on the money line. Mayweather is currently a -500 bet for the bout while McGregor sits at +385, according to sportsbook BetOnline.ag.