The lightest weight class in professional boxing is minimumweight , also called strawweight , with a limit of 105 lb (47.63 kg).

Quick Scoop

  • Lightest division: Minimumweight / Strawweight.
  • Weight limit: 105 pounds, or 47.63 kilograms.
  • It sits below light flyweight, flyweight, and the other higher divisions.

Simple example

A boxer who weighs 105 lb or less at the weigh-in can compete in minimumweight, while someone even a few pounds heavier would move up to the next class.

TL;DR: The lightest boxing weight class is minimumweight (strawweight) at 105 lb.