Within separate weight classes, boxing organizations and publications rank fighters based on a combination of their fight records, their track records and subjective judgements based on a fighter's performance in the ring, regardless of wins or losses. Because boxing rankings use a combination of objective fact and subjective expert opinion, boxers often have different rankings across various boxing publications and organizing bodies.
The most important factor that determines a boxer's ranking is her record of wins and losses in previous bouts. Boxers with a large ratio of wins to losses receive higher rankings than those with mediocre or losing records. However, even in the same weight class, many fighters have identical records, so ranking bodies use other factors in determining a boxer's rank.
A fighter's track record, her history of recent accomplishments in the ring, also factors into determining her rankings. For example, a fighter who earns an undefeated ranking with victories against inferior opponents may receive a lower ranking than a winning fighter with a few losses against skilled and difficult competition.
Lastly, a fighter's performance is also important for determining her ranking. Performance is significantly more subjective than the other two factors, and it accounts for much of the variability in a fighter's ranking between organizations. Performance includes such factors as a fighter's tenacity, speed and "chin," the ability to absorb physical punishment without falling unconscious.