Muay Thai Weight Classes: Ultimate Guide and FAQ

Muay Thai weight classes vary significantly across different promotions, from ONE Championship to the World Professional Muay Thai Federation (WPMF) and the International Kickboxing Federation (IKF).

These divisions are used to level the playing field in competition by matching fighters of similar weight, though amateur promotions may also factor in experience levels through classifications like C Class and B Class.

Since different fight promotions use different weight classes we’ve included a variety of different muay thai weight classes for several different promotions such as One Championship, WPMF, IKF, and World Thai Boxing Association. However, generally, you can usually expect at least 3-10 lbs separating each weight class.

Next, for amateur promotions, they may also use classifications of experience level using C Class, B Class, and N Class (with each class having its own set of rules and regulations).

Muay Thai Weight Classes

Male Weight Divisions

Each male division has its unique characteristics, with lighter weight classes focusing more on speed and technical skills, while heavier weight classes emphasize power and strength.

Related: Should You Train Muay Thai and BJJ at the Same Time? (Weekly Training Splits Inside)

Female Weight Divisions

Like other competitive martial arts, the male weight classes in Muay Thai are divided into several categories based on the fighter’s weight. These weight classes are essential to ensure fair competition and protect the athletes’ safety. Male Muay Thai weight classes typically range from Mini Flyweight (112 lbs) up to Heavyweight (above 190 lbs).

Here is a table of women’s weight classes with weight range in pounds and kilograms, along with the current world champions and contenders:

Like the male divisions, female Muay Thai weight classes are also divided into several categories based on the athlete’s weight. These divisions are crucial for ensuring fair competition and maintaining the safety of the athletes. Female weight classes in Muay Thai range from Atomweight (102 lbs) up to Heavyweight (above 175 lbs).

World Professional Muay Thai Federation (WPMF)

The WPMF is a significant organization that oversees professional Muay Thai competitions worldwide. It has 19 weight classes for males, ranging from 105 lbs to over 265 lbs, and 13 weight classes for females, starting at 102 lbs and going up to over 175 lbs. The WPMF is committed to promoting and developing Muay Thai around the world, organizing international events and championships.

International Kickboxing Federation (IKF)

The IKF is another prominent organization that sanctions both kickboxing and Muay Thai events. The IKF recognizes 20 male weight classes, ranging from 112 lbs to over 210 lbs, and 14 female weight classes, starting at 110 lbs and going up to over 190 lbs. The IKF aims to maintain a high standard of competition and has strict rules and regulations for its events.

World Thai Boxing Association (Junior Amateur and Adult)

The World Thai Boxing Association (WTBA) is a global organization that focuses on the development and promotion of Muay Thai.

The WTBA recognizes both junior amateur and adult weight classes, with 11 divisions for junior amateurs and 18 divisions for adults. The WTBA’s mission is to provide a platform for fighters to showcase their skills while ensuring fair competition.

Wolrd Muay Thai Council (WMC) Weight Classes and Rules

WMC Weight Classes for Muay Thai

General WMC Rules

• Eligibility:
  • Fighters must be at least 18 years old to compete.
  • Participants must weigh at least 100 lbs (45.36 kg) to be eligible for bouts.
  • Competitors in the same bout must have no more than a 5-pound weight difference.

Weigh-In Procedures

• Fighters must weigh in no more than 24 hours before the fight.
• They are required to weigh in without clothing to ensure accuracy.
• A physical examination by a licensed doctor is mandatory before the weigh-in to confirm that participants are fit to compete.
• Fighters are allowed at least three hours of rest between the weigh-in and the start of their match.
• A fighter’s manager or representative is permitted to observe the weigh-in process for transparency.

Match Rules and Regulations

• Rounds and Duration:
  • Bouts consist of 5 rounds lasting 3 minutes each, with 2-minute rest interval between rounds.
• Permitted Techniques:
  • Punches, kicks, knees, and elbows are all legal.
  • Clinching and sweeps are allowed, provided they align with WMC standards.
  • Fighters are encouraged to demonstrate traditional Muay Thai techniques.
• Prohibited Actions:
  • No headbutts, groin strikes, or attacks on the back of the head.
  • No use of ropes for leverage or dangerous throws targeting the neck or head.
  • No unsportsmanlike conduct such as biting or spitting.

Scoring Criteria

• Points are awarded based on:
  • Effective Strikes: Landing clean and impactful punches, kicks, knees, or elbows.
  • Ring Generalship: Dominating the ring and dictating the pace of the fight.
  • Defense: Skillfully avoiding or neutralizing an opponent’s attacks.
  • Technique: Executing Muay Thai moves with precision and style.

Health and Safety

• Anti-Doping Compliance:
  • Fighters must adhere to WADA guidelines and may undergo drug testing. Violations can lead to disqualification or suspension.
  • Anti-doping resources and educational tools are provided to athletes.
• Nutrition and Hydration:
  • Emphasis on proper nutrition and hydration for youth and professional fighters.
  • Strict measures are in place to discourage dangerous weight-cutting practices.

Cultural Traditions

• Fighters are required to perform the Wai Khru, a traditional dance to honor their trainers, country, and Muay Thai heritage.

WMC Resources and Initiatives

• Educational Programs: Includes resources on anti-doping, match-fixing prevention, and athlete career planning.
• Athlete Support: Tools for health, nutrition, and mental well-being.
• Royal Recognition: The WMC operates under royal patronage, promoting Muay Thai’s cultural and historical significance.
• Global Collaboration: Partnerships with organizations like IFMA, SportAccord, and WADA to uphold the integrity of the sport.

World Boxing Council Muay Thai (WBC Muaythai)

Male Divisions:

Female Divisions:

Rules and Regulations of WBC

1. Ring Specifications

• Size and Setup:
  • The ring must be square, with sides measuring 18 to 24 feet.
  • Four ropes, padded and securely fastened, must surround the ring.
  • Safety features like corner pads and stairways for fighters and officials are mandatory.

2. Gloves

• Standards:
  • Fighters in lighter weight classes (up to Welterweight) use 8-ounce gloves, while those in higher classes use 10-ounce gloves.
• Inspection:
  • Gloves must pass an official inspection to ensure compliance with WBC standards.

3. Hand Wrapping

• Material and Limits:
  • Fighters may use soft bandages up to 6 meters in length and tape for additional support. However, wraps must not cover the knuckles.
• Approval:
  • Hand wraps are inspected and approved by commission representative before the fight.

4. Fighter Attire

• Uniform Requirements:
  • Fighters wear Muay Thai shorts without shirts or shoes. Colors are assigned based on the corner (red or blue).
• Protective Gear:
  • Groin protection is required. Fighters with long hair must secure it, and excessive facial hair is discouraged unless for religious reasons.

5. Weight Divisions

• Fighters are categorized into weight classes to ensure fair competition:
  • Mini Flyweight: Up to 105 lbs.
  • Heavyweight: Over 230 lbs.
• Fighters must weigh in no more than 24 hours before the bout, with no clothing, and are required to rest for at least three hours post-weigh-in.

6. Fight Duration

• Rounds:
  • Matches consist of five rounds, each lasting three minutes, with two-minute breaks between rounds.

7. Legal Techniques

• Allowed Strikes:
  • Fighters can use punches, kicks, elbows, and knees.
• Clinching:
  • Permitted for landing strikes but must align with specific rules.
• Sweeps:
  • Allowed but must avoid dangerous throws targeting the neck or head.

8. Scoring System

• Criteria:
  • Points are awarded for effective strikes, ring control, defensive skills, and mastery of Muay Thai techniques. However, if a fighter is knocked down during a round that does not necessarily mean it will be scored 10-8. The judges must consider what occurred before the knockdown, aggressiveness, initiation etc.
    • A 10-8 is usually only given when there is an overwhelming one-sided round
• Judging:
  • Each round is scored individually, and the fighter with the most points at the end is declared the winner.

9. Fouls and Penalties

• Prohibited Moves:
  • Headbutts, groin strikes, and attacks to the spine or back of the head are forbidden.
• Consequences:
  • Violations result in warnings, point deductions, or disqualification.

10. Knockdowns

• Count Rules:
  • Fighters knocked down must respond to a mandatory eight-count. Multiple knockdowns in a single round may lead to the fight being stopped.

11. Medical Requirements

• Pre-Fight:
  • Fighters undergo a thorough medical check to ensure they are fit to compete.
• Post-Knockout Recovery:
  • Fighters knocked out during a bout are subject to mandatory rest periods before competing again.

12. Anti-Doping Regulations

• Testing:
  • Fighters must comply with anti-doping rules and may be tested for banned substances at any time.
• Penalties:
  • Violations can result in suspension or disqualification.

ONE Championship Muay Thai Weight Classes

ONE Championship is a leading martial arts organization based in Asia that is soon spreading to the US and features various disciplines, including Muay Thai.

ONE Championship has ten weight classes for both male and female fighters, ranging from Strawweight (up to 125 lbs) to Heavyweight (above 225 lbs). ONE Championship has become a major platform for Muay Thai fighters to compete on the international stage, attracting top talent from around the world.

Why Are One FC Muay Thai Weight Classes Different than Other Organizations?

ONE Championship has devised a unique approach to Muay Thai weight classes compared to other organizations like Bellator, UFC, and PFL.

Distinctively, ONE Championship features an Atomweight division, which aligns with the UFC’s Strawweight division and imposes a weight limit of 115 lbs.

Additionally, ONE Championship categorizes its weight classes somewhat differently from other major promotions.

For instance, the Lightweight division in UFC caps at 155 lbs, while ONE Championship’s Lightweight division has a 170 lbs limit, mirroring the Welterweight division in UFC.

The disparity in categorization stems from ONE Championship’s prohibition on weight cutting through dehydration.

In its place, the organization has introduced an innovative system that guarantees athletes remain hydrated, fit, and healthy before their fights. This weight management system is designed to dissuade fighters from resorting to extreme measures to make weight, which could jeopardize their health.

ONE Championship’s Hydration & Weigh-In System

ONE Championship has implemented a unique hydration and weigh-in system to promote fighter safety and discourage unhealthy weight cutting practices.

How Does ONE’s Hydration & Weigh-In System Work?

Under the ONE Championship system, fighters must pass multiple weigh-ins and hydration tests during fight week. The hydration tests measure a fighter’s urine specific gravity to ensure they are adequately hydrated before competing.

Fighters must make weight and pass the hydration tests on consecutive days before the event.

Advantages and Disadvantages of the System

• The primary advantage of the ONE Championship hydration and weigh-in system is that it promotes fighter safety by discouraging extreme weight cutting practices.

The system encourages fighters to compete at their natural weight, reducing the risk of dehydration, electrolyte imbalances, and other weight cutting-related health issues.

• The disadvantages of the system are that it can be logistically challenging and may require fighters to adjust their weight management strategies.

Some fighters may have difficulty maintaining their weight and hydration levels throughout the fight week, potentially impacting their performance.

How Is a Physical Examination Done For Muay Thai Bouts?

The physical examination for professional Muay Thai bouts, particularly concerning weight classes and making weight, involves several key steps to ensure fighters are healthy and eligible to compete in their expected division weight:

1. Pre-Fight Weigh-In

• Purpose: To confirm fighters meet the weight requirements for their specific class.
• Timing: Typically conducted 24 hours or the morning before the fight.
• Process: Fighters step on a calibrated scale under the supervision of officials. Both fighters must fall within the agreed weight class limits.
• Re-Weigh Options: If a fighter fails to make weight on the first attempt, they are often given additional time (usually 1-2 hours) to shed the excess weight.

2. Hydration Testing (in Some Promotions like One)

• Purpose: To prevent extreme weight cuts through dehydration.
• Process: Fighters provide a urine sample to assess hydration levels. Failing hydration tests may disqualify a fighter or require them to fight at a higher weight class.

3. Medical Examination

• Conducted by a Ringside Doctor:
  • Vital Signs: Blood pressure, pulse, and overall physical fitness are checked.
  • Weight Verification: Double-checked against official scales.
  • Injury Assessment: Inspection for any visible injuries, cuts, or conditions that could compromise safety.
  • Fitness Confirmation: Doctors confirm fighters are in suitable condition to endure the bout.

4. Post-Weigh-In Rehydration

• Fighters often rehydrate and refuel after the weigh-in, especially if they’ve undergone a significant weight cut. Some promotions monitor this process to ensure fighters don’t regain an unsafe amount of weight before the fight.

5. Fight-Day Physical Examination

• A second brief check occurs on the day of the fight to ensure the fighter is still in good condition, free from new injuries, and ready to compete.

Rajademnern Stadium Muay Thai Weight Classes

Rajadamnern Stadium is one of the most prestigious Muay Thai stadiums in Thailand, holding numerous events throughout the year.

Rajadamnern Stadium recognizes 13 male weight classes, and 12 female weight classes.

The stadium regularly hosts elite fighters, and winning a title at Rajadamnern Stadium is considered a significant achievement in a fighter’s career.

Lumpinee Stadium Muay Thai Weight Classes

Lumpinee Stadium is another legendary Muay Thai stadium in Thailand, known for hosting high-level bouts featuring the best fighters in the world.

Winning a Lumpinee Stadium title is a dream for many Muay Thai fighters and is considered a massive mark of excellence in the sport.

Muay Thai Weight Classes in Different Regions

Like other weight classes, weight classes in Muay Thai may vary depending on the region and the organization overseeing the competitions. This is why we’ve listed weight classes both in lbs and kg.

Here are some examples of weight classes used in different regions and organizations:

Muay Thai Weight Classes in kilograms (kg)

In many countries, especially in Europe and Asia, Muay Thai weight classes are defined in kilograms. These weight classes follow a similar structure to those in pounds but are adjusted to fit the metric system.

For example, the Mini Flyweight division in pounds (105 lbs) would be equivalent to the Mini Flyweight division in kilograms (47.6 kg).

For this reason, throughout this post, we have provided weight classes for muay thai from many organizations in both lbs and kg.

Muay Thai Weight Classes in the USA

Alternatively, in the United States, Muay Thai weight classes are often based on the International Kickboxing Federation (IKF) or World Thai Boxing Association (WTBA) guidelines and given in pounds (lbs).

These organizations also provide specific weight classes for both amateur and professional fighters in the country.

WBC Muay Thai Weight Classes

The World Boxing Council (WBC) is a global boxing organization that also recognizes Muay Thai as a separate discipline. The WBC Muay Thai weight classes follow the same structure as traditional boxing weight classes, with 17 divisions ranging from Mini Flyweight (105 lbs) to Heavyweight (above 200 lbs).

Muay Thai Weight Classes for Females

Female Muay Thai weight classes typically follow the same structure as male divisions, but with slightly different weight limits. Organizations such as the WPMF and IKF have specific weight classes for female fighters, ensuring fair competition and athlete safety.

Amateur Muay Thai Weight Classes

Amateur Muay Thai competitions may often follow the same weight class structure as professional events, but with more weight classes as well as additional age and experience restrictions.

Junior and youth divisions are typically also based on age and weight, while adult divisions may include experience-based classes such as Class C, B, and A.

Muay Thai Classifications and Experience Levels

In Muay Thai, fighters are often classified by their experience levels, commonly referred to as C, B, and N classes.

• N Class, or Novice Class, is for fighters new to competition but may have some experience in training. Fighters are still developing their skills and in early stages of their competitive careers.
  
• C Class is a beginner-level in Muay Thai with limited experience and fights have more safety equipment and shorter rounds
  
• B Class is an intermediate-level in Muay Thai with more experience than C Class. Additionally, fighters have better understanding of techniques and fewer safety restrictions than C Class

What Is C Class In Muay Thai?

C Class refers to beginner-level fighters in Muay Thai. These fighters have limited experience and are often just starting their competitive journey. C Class fights typically have more safety equipment, such as shin guards and headgear, and shorter rounds.

What Is B Class In Muay Thai?

B Class fighters are intermediate-level competitors with more experience than C Class fighters. They have a better understanding of Muay Thai techniques and strategy, and their bouts have fewer safety restrictions than C Class fights.

What Is N Class In Muay Thai?

N Class, or Novice Class, refers to fighters who are new to competition but may have some experience in training. These fighters are typically in the early stages of their competitive careers and are still developing their skills.

Weight Classes and Fighter Attributes

Understanding the relationship between weight classes and fighter attributes can help you determine the best division for your skill set and physical characteristics.

Muay Thai Weight Classes and Average Height

Each weight class has an average height range associated with it, which can provide a general idea of the size of fighters in that division.

For example, Mini Flyweight fighters typically have a shorter stature, while Heavyweight fighters are generally taller.

Muay Thai Weight Classes and Height

Knowing the average height of fighters in each weight class can be helpful in determining the optimal weight class for an individual.

By comparing your height to the average height of fighters in each division, you can find the weight class that best suits your physical attributes.

The best weight class for a fighter depends on several factors, including

• height
• reach
• natural weight
• fighting style

To determine the best weight class, a fighter should consider their physical attributes and performance in training and competition. Consulting with a coach or experienced fighter can also provide valuable insight into the ideal weight class for an individual.

Here’s our breakdown of common characteristics of each muay thai weight class:

Junior Flyweight (105-108 lbs / 47.63-48.99 kg)

• Attributes: Fighters in this class are often incredibly fast, with quick footwork and high-volume striking.
• Fighting Style: Focus on speed, agility, and endurance. Their smaller size allows for rapid exchanges and dynamic movement.

Flyweight (108-112 lbs / 48.99-50.81 kg)

• Attributes: Slightly more power than junior flyweights while retaining speed and agility – a good balance of power and technique
• Fighting Style: Blends quick strikes with an ability to counter effectively. Clinch work becomes a bigger factor.

Junior Bantamweight (112-115 lbs / 50.81-52.17 kg)

• Attributes: Fighters maintain a balance of speed and developing power.
• Fighting Style: High-paced action with more use of elbows and knees in exchanges due to better clinch control.

Bantamweight (115-118 lbs / 52.17-53.53 kg)

• Attributes: Known for their stamina and precise striking.
• Fighting Style: Fighters here often focus on technical precision, using every weapon effectively—punches, kicks, elbows, and clinch work.

Junior Featherweight (118-122 lbs / 53.53-55.34 kg)

• Attributes: Increased power while maintaining speed and mobility.
• Fighting Style: Fighters can deliver knockout blows while still using dynamic footwork and fast combinations.

Featherweight (122-126 lbs / 55.34-57.16 kg)

• Attributes: A mix of speed and power, with fighters beginning to display more physical dominance.
• Fighting Style: They excel in all ranges, combining strong clinch work with powerful mid-range kicks and punches.

Junior Lightweight (126-130 lbs / 57.16-58.97 kg)

• Attributes: More physically imposing with improved knockout potential.
• Fighting Style: Fighters rely on strong leg kicks and solid body shots to wear opponents down while maintaining good speed.

Lightweight (130-135 lbs / 58.97-61.24 kg)

• Attributes: Well-rounded with excellent stamina and solid power.
• Fighting Style: Combines technical proficiency with the ability to end fights through strikes or clinch dominance.

Junior Welterweight (135-140 lbs / 61.24-63.51 kg)

• Attributes: Transitioning into heavier strikes with better durability.
• Fighting Style: Focus on leveraging power with high-pressure tactics, including body shots and head kicks.

Welterweight (140-147 lbs / 63.51-66.68 kg)

• Attributes: Strong balance of speed, power, and endurance.
• Fighting Style: Versatile, able to brawl in close or use longer-range strikes effectively. Fighters often aim for powerful finishes.

Junior Middleweight (147-156 lbs / 66.68-70.76 kg)

• Attributes: Increased knockout potential, with fighters emphasizing strength and durability.
• Fighting Style: Heavy use of clinch control, knees, and devastating kicks, while still retaining agility.

Middleweight (156-160 lbs / 70.76-72.58 kg)

• Attributes: Fighters at this weight possess strong striking power and endurance.
• Fighting Style: They often emphasize powerful strikes and effective clinch techniques, controlling the fight with their physicality.

Junior Heavyweight (160-175 lbs / 72.58-79.38 kg)

• Attributes: Known for their size and raw power, with more emphasis on knockout potential.
• Fighting Style: Slower-paced fights compared to lighter classes, focusing on power and calculated striking.

Heavyweight (175+ lbs / 79.38+ kg)

• Attributes: Fighters in this class rely on overwhelming power and physical dominance.
• Fighting Style: Focus on powerful strikes, with less emphasis on speed. Precision and calculated offense are crucial due to the potential for devastating knockouts.

What Size Gloves Do You Use for Different Weight Classes?

The size of gloves used in Muay Thai depends on the weight class and the organization’s rules.

• Generally, fighters in lighter weight classes use 8-ounce or 10-ounce gloves,
• Heavier weight classes use 12-ounce or 14-ounce gloves.

Some organizations, like the World Boxing Council (WBC), specify glove sizes for each weight class in their rulebook. It’s essential to check the competition guidelines before selecting your gloves.

Cutting Weight in Muay Thai

Cutting weight is a common practice in Muay Thai and many other combat sports and a critical aspect of a fighter’s training.

Understanding the reasons and methods behind cutting weight can help fighters make informed decisions about their weight management strategies.

Why Do Muay Thai Fighters Cut Weight?

Muay Thai fighters cut weight to gain a competitive advantage in their weight class.

By cutting weight, a fighter can compete against opponents who may be smaller or weaker, giving them an edge in the ring.

Additionally, some fighters believe that cutting weight helps them feel more agile and energetic during a fight.

How Muay Thai Fighters Cut Weight (And The Risks Involved)

Weight cutting is a standard practice in Muay Thai, with fighters attempting to reach their efficient weight class to maximize their chances of victory. The process usually begins days before weight classes are finalized, with fighters strategically reducing water weight and body fat.

The most common weight-cutting techniques include:

• Water depletion – Gradually reducing water intake leading up to weigh-ins.
• Sauna and sweat suits – Forcing the body to shed excess water.
• Low-carb diets – Reducing glycogen stores to drop weight quickly.
• Increased cardio training – Burning off excess fat through high-intensity workouts.

However, extreme weight cuts for safety must be monitored by professional trainers to prevent serious health risks. Fighters who cut too much weight often experience:

• Severe dehydration – Leading to dizziness, cramping, and fatigue.
• Loss of strength and endurance – Impacting overall performance.
• Higher risk of injury – Due to weakened muscles and joints.

ONE Championship has introduced a hydration test to prevent extreme weight cuts. Fighters must pass both a weigh-in and hydration test before being allowed to compete, ensuring their bodies are in peak condition for fight night.

How Much Weight Do Muay Thai Fighters Cut?

The amount of weight a Muay Thai fighter cuts varies depending on their natural weight, the weight class they compete in, and their individual weight-cutting strategy. Some fighters may cut only a few pounds, while others may cut 10-15% of their body weight or more. It’s crucial for fighters to find a weight-cutting strategy that works for them without compromising their health or performance.

The Process of Cutting Weight

Cutting weight typically involves a combination of diet, exercise, and dehydration techniques. Fighters often start by reducing their calorie intake and increasing their exercise routine to lose body fat. In the final days before a fight, they may use dehydration techniques, such as sweating in a sauna, to shed additional water weight. After weighing in, fighters typically rehydrate and replenish their energy stores to prepare for the fight.

Risks and Benefits of Cutting Weight

While cutting weight can provide a competitive advantage, it also carries significant risks. Rapid weight loss can lead to dehydration, electrolyte imbalances, and diminished physical and mental performance. In extreme cases, weight cutting can cause organ damage or even death. Fighters should carefully consider the risks and benefits of cutting weight and consult with medical professionals to ensure they are doing so safely.

Should Amateurs Cut Weight for a Fight?

Amateur fighters may choose to cut weight for a fight, but it’s essential to weigh the potential benefits against the risks. Since amateur fights are typically shorter and have fewer stakes, the advantages of cutting weight may be less significant than in professional bouts. Amateur fighters should prioritize learning and developing their skills rather than focusing on weight cutting.

A Brief History of Muay Thai Weight Classes

Here is a quick breakdown on the history of muay thai weight classes as well as other standards for bouts:

• Early Days of Muay Thai
  • Fighters competed with little concern for weight differences.
  • The focus was on skill, endurance, and strategy rather than size.
• The Shift to Modernization
  • As Muay Thai gained popularity globally, weight classes were introduced for fairness and safety and to meet common international standards
  • Thai staples like Rajadamnern and Lumpinee Stadium led the charge in standardizing divisions.
• Global Influence and Refinement
  • Organizations like the World Professional Muay Thai Federation (WPMF) and International Kickboxing Federation (IKF) expanded and adjusted weight classes.
  • Unique approaches, such as ONE Championship’s hydration system, prioritize fighter health by discouraging extreme weight cuts.

Muay Thai has a rich history that dates back to the 13th century, evolving from battlefield combat into a modern competitive sport. During the 16th century, Muay Thai contests gained popularity as organized fights became more common. However, it wasn’t until the 20th century that the sport saw major reforms with the adoption of weight classes, making matches fairer and reducing the risks of injury.

Originally, fighters competed in the open-weight category, where size and weight discrepancies were often extreme. Larger fighters had an overwhelming advantage over their smaller opponents, leading to huge weight disparities that made many fights uneven. Over time, foreign influences led to the standardization of divisions, ensuring that fighters competed against opponents of similar size and skill.

Today, Muay Thai follows a well-defined championship title weight category structure across different organizations. The introduction of padded gloves, structured weight limits, and regulated intervals of rounds have played a pivotal role in shaping Muay Thai as a legitimate global sport.

Why It Matters Today

These developments have turned Muay Thai into a more globally accessible sport where fighters of all sizes can compete fairly.

Weight classes serve as the foundation of fair competition, preventing extreme weight discrepancies and keeping matches fair. Without weight divisions, smaller fighters would face huge weight disparities, putting them at a severe disadvantage.

Each weight class also brings a different fighting style and set of strengths. Middleweight classes, for example, strike a balance between power and endurance, making them one of the most exciting weight classes to watch. In contrast, lighter divisions focus more on speed and agility, while heavier divisions prioritize knockout power.

Fighters must also consider the day before fight night, as most weigh-ins take place then. This allows athletes on weight cuts to attempt last-minute adjustments to make the required weight limit. However, extreme weight cutting can lead to fatigue, dehydration, and poor performance inside the ring.

To make matches fair, most organizations enforce a rule where competitors cannot have a weight difference of more than 5 pounds within the same division. This prevents significant weight discrepancies and ensures a fair contest.

Muay Thai Weight Classes Around the World

Weight class structures vary by region, with slight differences in how promotions categorize fighters. In Thailand, the most competitive weight classes fall between 108-126 lbs, as most Thai fighters are naturally smaller.

In contrast, Western promotions such as WBC Muay Thai and IKF tend to feature more middleweight classes, with 143-160 lbs being the most exciting weight classes for international audiences.

Some of the biggest weight discrepancies between regional organizations include:

• Thailand Promotions (Rajadamnern, Lumpinee) – Lighter divisions are more common.
• North America & Europe (IKF, WBC) – Focuses more on middleweight classes.
• ONE Championship – Uses a hydration-based weigh-in system, leading to a different structure.

These slight differences in weight classes reflect cultural and physiological variations among athletes, shaping the competitive landscape of Muay Thai worldwide.

Muay Thai Weight Classes in Comparison to Other Combat Sports

Muay Thai weight classes differ from those in other combat sports, such as UFC & MMA, GLORY Kickboxing, and Olympic Wrestling. Comparing these weight classes can provide insight into the similarities and differences between these sports.

UFC & MMA Weight Classes

UFC and MMA weight classes generally have broader ranges than Muay Thai, with more significant gaps between divisions. The UFC, for example, has eight male weight classes and four female weight classes.

MMA has fewer weight classes than Muay Thai, with bigger gaps between divisions. For example, UFC’s Lightweight division (155 lbs) is equivalent to Muay Thai’s Welterweight division.

The male weight classes in UFC are:

1. Strawweight: 115 lbs (52.2 kg)
2. Flyweight: 125 lbs (56.7 kg)
3. Bantamweight: 135 lbs (61.2 kg)
4. Featherweight: 145 lbs (65.8 kg)
5. Lightweight: 155 lbs (70.3 kg)
6. Welterweight: 170 lbs (77.1 kg)
7. Middleweight: 185 lbs (83.9 kg)
8. Light Heavyweight: 205 lbs (93 kg)
9. Heavyweight: 265 lbs (120.2 kg)

For female fighters in the UFC, there are four weight classes:

1. Strawweight: 115 lbs (52.2 kg)
2. Flyweight: 125 lbs (56.7 kg)
3. Bantamweight: 135 lbs (61.2 kg)
4. Featherweight: 145 lbs (65.8 kg)

GLORY Kickboxing Weight Classes

GLORY Kickboxing features multiple weight classes for both male and female fighters. GLORY Kickboxing features similar weight classes but has a slightly different naming system. The fighting style also differs, as Muay Thai allows elbows and clinch work, while kickboxing focuses on punches and kicks.

The weight classes are similar to those in Muay Thai but have some differences in the weight ranges:

1. Featherweight: 143 lbs (65 kg)
2. Lightweight: 154 lbs (70 kg)
3. Welterweight: 170 lbs (77 kg)
4. Middleweight: 187 lbs (85 kg)
5. Light Heavyweight: 209 lbs (95 kg)
6. Heavyweight: 264 lbs (120 kg)

Olympic Wrestling Weight Classes

Olympic wrestling has different weight classes for both freestyle and Greco-Roman wrestling. The weight classes for male freestyle wrestling are:

1. 57 kg (125.7 lbs)
2. 65 kg (143.3 lbs)
3. 74 kg (163.1 lbs)
4. 86 kg (189.6 lbs)
5. 97 kg (213.8 lbs)
6. 125 kg (275.6 lbs)

For female freestyle wrestling, the weight classes are:

1. 50 kg (110.2 lbs)
2. 53 kg (116.8 lbs)
3. 57 kg (125.7 lbs)
4. 62 kg (136.7 lbs)
5. 68 kg (149.9 lbs)
6. 76 kg (167.6 lbs)

Rules and Regulations in Muay Thai

Understanding the rules and regulations of Muay Thai is essential for fighters and fans alike. Knowing how to win a Muay Thai fight, the rules for a Muay Thai fight, and the global Muay Thai rule set will help you appreciate the sport more.

How Do You Win a Muay Thai Fight?

A Muay Thai fight can be won in several ways:

1. Knockout (KO): When a fighter is knocked down and unable to continue within the referee’s count.
   
2. Technical Knockout (TKO): When the referee stops the fight due to a fighter’s inability to continue or protect themselves.
   
3. Decision: If the fight goes the full distance, the winner is determined by the judges’ scorecards. The fighter with the higher score wins.
   
4. Draw: If the judges’ scores are equal, the fight is declared a draw.

What Are the Rules for a Muay Thai Fight?

Muay Thai fights are governed by a set of rules that dictate legal techniques, safety requirements, and scoring criteria. Some of the primary rules include:

1. Legal techniques: Fighters can use punches, kicks, knees, and elbows to strike their opponents. Clinching and sweeping are also allowed.
   
2. Illegal techniques: Headbutts, groin strikes, strikes to the back of the head, and strikes to a downed opponent are not allowed.
   
3. Scoring: Judges score each round based on effective striking, aggression, and ring control. Points are awarded for clean, powerful strikes that visibly affect the opponent.
   
4. Safety equipment: Fighters must wear gloves, a mouth guard, and a groin guard. Some organizations may also require fighters to wear shin guards and headgear, especially in amateur bouts.

Glove & Equipment Rules Per Weight Class

Muay Thai organizations enforce different glove sizes and protective gear based on a fighter’s weight.

• Lightweight Fighters (≤135 lbs) – Use 8 oz gloves.
• Middleweight Fighters (135-160 lbs) – Use 10 oz gloves.
• Heavyweight Fighters (175+ lbs) – Use 12 oz gloves for extra hand protection.

In amateur bouts, fighters must wear shin guards, headgear, and padded gloves to ensure safety in competition. This is especially important for athletes on weight cuts, as dehydration increases injury risks.

Global Muay Thai Rule Set

The global Muay Thai rule set aims to standardize the sport across different organizations

and countries. This rule set includes the following key aspects:

1. Rounds: Professional Muay Thai bouts typically consist of five 3-minute rounds with 2-minute break between rounds. Amateur fights often have three 2-minute rounds with 1-minute breaks.
   
2. Weight classes: Global rules usually adhere to the weight classes outlined earlier in this article.
   
3. Judging criteria: Judges evaluate fighters based on effective striking, aggression, and ring control. Emphasis is placed on the impact of the strikes rather than their quantity.
   
4. Fouls: Fighters are penalized for fouls such as headbutts, groin strikes, and strikes to the back of the head. Repeated fouls may result in point deductions or disqualification.
   
5. Medical checks: Fighters must undergo pre-fight medical examinations to ensure their fitness to compete.

Age and Muay Thai

Age plays a significant role in the development of Muay Thai fighters, both in terms of starting the sport and determining the appropriate time to retire.

What Is a Good Age to Start Muay Thai?

There is no specific age requirement for starting Muay Thai, as individuals can begin training at any age. However, it is generally recommended for children to start around the age of 8 to 10. This allows them to develop a strong foundation in the sport while they are still young and adaptable.

What Age Is Too Late for Muay Thai?

While there is no definitive age limit for starting Muay Thai, it becomes increasingly challenging to develop the necessary skills and compete at a high level as one gets older.

Nonetheless, individuals can still enjoy the physical and mental benefits of Muay Thai training at any age even if they start later in life.

Current Muay Thai Champions and Belt Holders

It is essential to recognize and celebrate the accomplishments of the current Muay Thai champions and belt holders in various organizations.

IBF Muay Thai World Champions

Here is a table summarizing the current IBF Muay Thai World Champions:

The International Boxing Federation (IBF) recognizes Muay Thai world champions across several weight classes. These champions represent the pinnacle of their respective divisions and serve as role models for aspiring fighters.

ONE Championship Muay Thai Belt Holders

ONE Championship is a prominent organization in the world of combat sports, hosting events featuring Muay Thai, MMA, and kickboxing. They have established their own weight classes and recognize champions in each division.

Frequently Asked Questions about Muay Thai Weight Classes

What Is Open Weight Class in Muay Thai?

An open weight class in Muay Thai is a weight class where there are no weight restrictions.

This means that fighters of any weight can compete against each other, and there are no weight restrictions. Open weight classes are not as common in Muay Thai as they are in other combat sports such as mixed martial arts, but they do exist in some promotions and events.

Fighters in open weight classes often have to adjust their fighting style and strategy to account for the size and strength difference between themselves and their opponents.

What Does Pound for Pound Mean?

The term “pound for pound” refers to a comparison of fighters across different weight classes.

It is a way to rank fighters based on their skills, accomplishments, and overall performance, regardless of their size. A pound-for-pound ranking aims to determine the best fighters in the sport, irrespective of their weight class.

What is the most competitive weight class in Muay Thai?

In Thailand, the most competitive weight classes are 108-126 lbs, while 143-160 lbs are the most watched internationally.

How many weight classes are there in Muay Thai?

Most promotions have 14-20 weight divisions, though specific organizations may have slight differences in their categorization.

What happens if a fighter misses weight?

If a fighter exceeds the championship title weight category, they may be:

• Fined a percentage of their purse.
• Forced to compete in a heavier division.
• Disqualified from title contention.

How does the fight physician determine if a fighter is fit to compete?

A fight physician evaluates a fighter’s:

• Hydration levels – Ensuring they didn’t cut too much weight.
• Physical condition – Checking for injuries.
• Overall health – Making sure they are medically cleared for fight night.

Thanks for reading, I hope this post has provided some insight into a variety of different muay thai weight classes – Zack

Zack Nicholas

Zack is an avid jiu jitsu practitioner and martial arts nerd. He currently holds a brown belt in BJJ. When not on the mats or in the gym, he can be found going for walks with his wife, attempting (and often failing) to train his dog, and frequently obsessing over a specific hobby only to forget about it a week later.