Floyd Mayweather has earned over $800 million throughout his career

[Ruthless-RKO]

Below is a list of earnings, per The Sports Daily, from each of his fights.

Oct 11/96 – W (Apodaca) – $2,500

Nov 30/96 – W (Sanders) – N/A

Jan 18/97 – W (Cooper) – $7,500

Feb 1/97 – W (Ayala) – N/A

Mar 12/97 – W (Rodriguez) – N/A

Apr 12/97 – W (Giepart) – $5,000

May 9/97 – W (Duran) – $2,000

Jun 14/97 – W (O’Shields) – N/A

Jul 12/97 – W (Chavez) – N/A

Sep 6/97 – W (Leija) – N/A

Oct 14/97 – W (Garcia) – N/A

Nov 20/97 – W (Nunez) – N/A

Jan 9/98 – W (Arroyo) – N/A

Feb 28/98 – W (Girard) – N/A

Mar 23/98 – W (Melo) – N/A

Apr 18/98 – W (Cuello) – N/A

Jun 14/98 – W (Pep) – N/A

Oct 3/98 – W (Hernandez) – $137,000

Dec 19/98 – W (Manfredy) – $500,000

Feb 17/99 – W (Rios) – N/A

May 22/99 – W (Juuko) – $400,000

Sep 11/99 – W (Genera) – $500,000

Mar 18/00 – W (Vargas) – $750,000

Oct 21/00 – W (Augustus) – $250,000

Jan 20/01 – W (Corrales) – $1,500,000

May 26/01 – W (Hernandez) – $2,200,000

Nov 10/01 – W (Chavez) – $1,800,000

Apr 20/02 – W (Castillo) – $2,200,000

Dec 7/02 – W (Castillo) – $2,400,000

Apr 19/03 – W (Sosa) – $2,800,000

Nov 1/03 – W (N’dou) – $3,000,000

May 22/04 – W (Corley) – $3,000,000

Jan 22/05 – W (Bruseles) – N/A

Jun 25/05 – W (Gatti) – $3,200,000

Nov 19/05 – W (Mitchell) – $4,300,000

Apr 8/06 – W (Judah) – $5,000,000

Nov 4/06 – W (Baldomir) – $8,000,000

May 5/07 – W (De La Hoya) – $25,000,000

Dec 8/07 – W (Hatton) – $38,000,000

Sep 19/09 – W (Marquez) – $25,000,000

May 1/10 – W (Mosley) – $40,000,000

Sep 17/11 – W (Ortiz) – $40,000,000

May 5/12 – W (Cotto) – $45,000,000

May 4/13 – W (Guerrero) – $34,000,000

Sep 14/13 – W (Alvarez) – $73,000,000

Mar 3/14 – W (Maidana) – $32,000,000

Sept 13/14 – W (Maidana) – $32,000,000

Mar 2/15 – W (Pacquiao) – $250,000,000

Sept 12/15 – W (Berto) – $32,000,000

Aug 27/17 – W (McGregor) – $100,000,000

Career Earnings (disclosed): $807,954,000

[Ruthless-RKO]

Looks like some of them as base guaranteed purses and some include PPV revenue.

[pound per pound]

He might lose his 51st fight to the IRS?

[jujigatame]

The money that McGregor farce made was unreal. I still cannot believe so many people bought it.

[Tevfik1907]

Well that's why he is more of a business man than a boxer, there is a reason why he ducked so many fights and never become the undisputed champ in any division, because he fought the fights that only helps him to earn money, instead of being an undisputed and respectable champion of any weight division in boxing.

[Enlightened-One]

Well that's why he is more of a business man than a boxer, there is a reason why he ducked so many fights and never become the undisputed champ in any division, because he fought the fights that only helps him to earn money, instead of being an undisputed and respectable champion of any weight division in boxing.

Let's evaluate Floyd Mayweather Jr's career...

• Possesses an unblemished 50-0 professional record, with 27 KO’s
• Competed in 29 world title fights (if we include the lineal championship as well)
• Has gained world titles in five weight divisions (super featherweight, lightweight, light welterweight, welterweight & light middleweight)
• Has won twelve world title belts from the big four governing bodies
• Has consistently been ranked amongst the top ten pound-for-pound Ring Magazine rankings during his career
• Was the Ring Magazine’s fighter of the year in 1998 & 2007
• 24 of his victories have come against 22 former world champions
• Floyd achieved a 17-fight winning streak against former/current world champions when he defeated Andre Berto, a run which commenced a decade prior (against Arturo Gatti [25/06/2005])
• Floyd Mayweather Jr. has been a professional boxer for two decades
• Money May won his first world title fight 17 years prior to his final world championship bout, by defeating Genaro Hernandez (a Hall-of-Fame nominee, a man who had competed in 15 world title bouts, had only previously been defeated by Oscar De La Hoya [in a weight class that was not his natural habitat] and who also boasted a victory against an all-time-great [Azumah Nelson])
• Ring Magazine rates Floyd Mayweather Jr. in 12th position of its pound-for-pound “Best-of-Modern Times” list (based on the votes of 20 boxing experts to determine the Top 20 fighters since World War II)
• Based on the aggregated totals of all fights on his resume, the average Floyd Mayweather Jr. opponent lands a mere 16% of punches thrown, this is the lowest collective figure recorded in CompuBox's 4,000-fight database (as of May 2014)
• Mayweather had the best plus/minus rating of any fighter (as of September 2014), which is a measure of the variance between Floyd’s own connect rate and that of his opponents’ (in other words, a gauge of the “Hit and don't get hit” old adage)
• BoxRec considers Floyd Mayweather Jr. the greatest of all time

In terms of Floyd Mayweather Jr’s final sixteen opponents of his career:

• Five were top-ten ranked pound-for-pounders at the time he faced them (Juan Manuel Marquez, Ricky Hatton, Shane Mosley; Canelo Alvarez and Manny Pacquiao)
• Five are dead-cert first ballot Hall-of-Famers (Juan Manuel Marquez, Oscar De La Hoya, Shane Mosley; Miguel Cotto and Manny Pacquiao)
• Fifteen opponents were world champions during their careers
• Two are currently ranked in the top-ten pound-for-pound list and are also current world title holders (Canelo Alvarez [fighter of the year 2019] and Manny Pacquiao)
• Ten held world titles in multiple weight divisions (Zab Judah; Juan Manuel Marquez; Ricky Hatton; Oscar De La Hoya; Manny Pacquiao; Marcos Maidana; Saul Alvarez; Robert Guerrero; Miguel Cotto; and Shane Mosley)

At least twelve of the fighters Floyd Mayweather Jr. faced were fighters that became Hall-of-Fame inductees or at least good enough to be included in the nominees listed in the annual IBHoF voting ballot:

• Arturo Gatti
• Oscar De La Hoya
• Juan Manuel Márquez
• Canelo
• Manny Pacquiao
• Genaro Hernández
• Jose Luis Castillo
• Diego Corrales
• Ricky Hatton
• Shane Mosley
• Miguel Cotto
• Zab Judah

World Titles:
• WBC Super Featherweight Title (1998-2002; 8 defenses)
• WBC Lightweight Title (2002-2004; 3 defenses)
• WBC Super Lightweight Title (2005; 0 defenses)
• IBF Welterweight Title (2006; 0 defenses)
• (2) WBC Welterweight Title (2006-2008; 1 defense, 2011-2015; 5 defenses)
• (2) WBC Super Welterweight Title (2007; 0 defenses, 2013-2015; 1 defense)
• WBA Super Welterweight Super Title (2012-2016; 1 defense)
• WBA Welterweight Super Title (2014-2016; 3 defenses)
• WBO Welterweight Title (2015; 0 defenses)

Unified Titles:
• Unified Junior Middleweight Title (2013-2015; WBA, WBC)
• (2) Unified Welterweight Title (2014-2015; WBC, WBA, 2015; WBC, WBA, WBO)
• Simultaneously held WBC Welterweight Title and WBC Junior Middleweight Title (2007)
• Simultaneously held WBC Welterweight Title and WBA Junior Middleweight Title (2012-2015)
• Simultaneously held WBC Welterweight Title and Unified Junior Middleweight Title (WBA, WBC) (2013-2015)
• Simultaneously held Unified Welterweight Title (WBC, WBA) and Unified Junior Middleweight Title (WBA, WBC) (2014-2015)
• Simultaneously held Unified Welterweight Title (WBC, WBA, WBO) and Unified Junior Middleweight Title (WBA, WBC) (2015)

The Ring Magazine Titles:
• World Lightweight Title (2002-2004)
• (2) World Welterweight Title (2006-2008, 2013-2015)
• World Junior Middleweight Title (2013-2015)

Lineal Titles:
• World Junior Lightweight Title (1998-2002)
• World Lightweight Title (2002-2004)
• (2) World Welterweight Title (2006-2008, 2010-2015)
• World Junior Middleweight Title (2013-2015)

[Tevfik1907]

• Possesses an unblemished 50-0 professional record, with 27 KO’s

He literally lost to Castillo in the first fight, saved by biased judges.

If that's your first and main argument, it won't work because not only he actually lost a fight, he was also ducking fights all the time.

Also one of his fights was practically a joke, which was against an mma fighter in his first pro boxing fight, LOL. It's better to call it 48-1.

• Competed in 29 world title fights (if we include the lineal championship as well)
• Has gained world titles in five weight divisions (super featherweight, lightweight, light welterweight, welterweight & light middleweight)
• Has won twelve world title belts from the big four governing bodies
• Has consistently been ranked amongst the top ten pound-for-pound Ring Magazine rankings during his career
• Was the Ring Magazine’s fighter of the year in 1998 & 2007
• 24 of his victories have come against 22 former world champions
• Floyd achieved a 17-fight winning streak against former/current world champions when he defeated Andre Berto, a run which commenced a decade prior (against Arturo Gatti [25/06/2005])
• Floyd Mayweather Jr. has been a professional boxer for two decades
• Money May won his first world title fight 17 years prior to his final world championship bout, by defeating Genaro Hernandez (a Hall-of-Fame nominee, a man who had competed in 15 world title bouts, had only previously been defeated by Oscar De La Hoya [in a weight class that was not his natural habitat] and who also boasted a victory against an all-time-great [Azumah Nelson])
• Ring Magazine rates Floyd Mayweather Jr. in 12th position of its pound-for-pound “Best-of-Modern Times” list (based on the votes of 20 boxing experts to determine the Top 20 fighters since World War II)
• Based on the aggregated totals of all fights on his resume, the average Floyd Mayweather Jr. opponent lands a mere 16% of punches thrown, this is the lowest collective figure recorded in CompuBox's 4,000-fight database (as of May 2014)
• Mayweather had the best plus/minus rating of any fighter (as of September 2014), which is a measure of the variance between Floyd’s own connect rate and that of his opponents’ (in other words, a gauge of the “Hit and don't get hit” old adage)
• BoxRec considers Floyd Mayweather Jr. the greatest of all time

And because of ducking the fights, he was never the undisputed champion in any weight division.

https://en.wikipedia.org/wiki/List_of_u ... _champions

Search his name, you will not find it.

You also can't find a single Floyd fight outside of USA, how can you be a great champion if you don't even fight outside of your home, not even once.