Featherweight in professional Muay Thai is contested at 57.2 kilograms (126 pounds) under stadium rules, matching boxing's featherweight limit exactly. The major Thai stadiums (Lumpinee and Rajadamnern), the World Muaythai Council (WMC), the WBC Muaythai, ONE Championship, and Glory's kickboxing-derived divisions all recognize the weight.
Featherweight has been one of the most competitive divisions in stadium Muay Thai history. The Thai stadium ranking system has produced legendary champions across decades. Buakaw Banchamek (now Por Pramuk) campaigned across the 67-70 kilogram range internationally but built his reputation in stadium Muay Thai at lower weights. Saenchai PKSaenchaimuaythaigym is widely considered the greatest pound-for-pound Muay Thai fighter of his generation and competed across multiple lower weights including featherweight. Sittichai Sitsongpeenong, Petchmorakot Petchyindee Academy, and the dominant featherweight champions of the 2000s and 2010s have defined the modern era.
Notable record holders are difficult to summarize cleanly because Muay Thai championship history is fragmented across stadiums, federations, and shifting weight classes. The most reliable benchmark is stadium of-the-year recognition, which has gone to featherweight champions multiple times. Saenchai's career across multiple weights including featherweight is widely considered one of the greatest in stadium Muay Thai history.
Featherweight is a finishing-heavy division by stadium Muay Thai standards. The 57.2-kilogram frame produces meaningful knockout power, and title fights at this weight have historically featured high finish rates compared to lower divisions. Knee strikes from the clinch, leg kicks, and elbows are all critical, and successful champions typically blend the four main stadium tools without overspecializing.
Crossover to other rulesets at this weight is particularly clean. Muay Thai featherweight aligns exactly with boxing featherweight (126 lb / 57.2 kg) by limit, and many Thai fighters have competed in both rulesets at the same weight. In MMA, 126 pounds sits between strawweight (115 lb) and flyweight (125 lb), so a Muay Thai featherweight would typically compete in MMA flyweight depending on walking weight. ONE Championship's featherweight Muay Thai is 155 pounds (70.3 kg) with hydration testing.