Muay Thai weight Classes (2021)

What are Muay Thai Weight Divisions?

There are several muay thai fight promotions with different weight classes, pound to pound or kilo fighters.

The weight classes limit a particular weight category where both fighters have to fall into the same category to fight each other.

In this way, no one can get the advantage of gaining weight.

Before a fight, almost every fighter has to go through a process called weight-cut, to compete against the same weight class.

From Thailand to every country doing professional fight have to have a weight class for their male and female fighter.

The motive for Weight Classes & Divisions

In a muay thai fight, the most important thing is striking.

And a striking power depends on some particular things like efficiency, speed, position, technique, and the most importantly the delivery force.

The force is increase when the mass is increased. This Means a fighter with bigger muscle or fat weight, will have more force = more striking power.

It means a heavy-weight fighter will have more striking power than a lightweight fighter.

So, weight mismatches are very dangerous and a big disadvantage for small fighters in any combat sport.

That’s why the weighting classes are made for fair and safe fighting, by having the same weight class competitors.

In the muay thai world every pound matters, cause 1 pound of excess weight can cause someone a big disadvantage.

Sometimes announced matches get stopped because of weight mismatch.

muay thai weight classes
Source: Facebook

In Thailand, more experienced fighters are given weight disadvantages to make the fight overall equal.

A famous example is Saenchai – The Muay Thai legend. Many times he had matches with weight disadvantage on his carrier peak against foreign fighters to have an almost equal fight.

Sometimes he had as much as 10-12 pound over fighters.

Muay Thai All Weight Classes

Every fighter has a different type of body shape and weight. But in a promotion fight, they all have to fall under this particular weight category.

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And sometimes it became very hard to cut weight for a fighter to go against his/her natural weight.

But every promotion has different weight classes and it differs a lot.

But here I will list all the professional stadium and WBC Muay Thai (World Boxing Council) weight classes.

Weight Classes Pounds Kg.
Mini Flyweight 100 lbs. but not more than 105 lbs.45.454 kg to 47.727 kg
Light Flyweight 105 lbs. to 108lbs.47.727 kg to 48.988 kg
Flyweight108 lbs. but not more than 112 lbs.48.988 kg to 50.803 kg
Light Bantamweight112 lbs but not exceeding 115lbs.50.803 kg to 52.163 kg
Bantamweight115 lbs. to 118 lbs.52.163 kg to 53.524 kg
Light Featherweight118 lbs. to 122 lbs.53.524 kg to 55.339 kg
Featherweight122 lbs but not more than 126 lbs.55.339 kg to 57.153 kg
Super Featherweight126 lbs. to 130 lbs.57.153 kg to 58.97 kg
Lightweight 130lbs. to 135 lbs.58.97 kg to 61.24
Super Lightweight135 lbs. to 140 lbs.61.24 kg to 64 kg
Welterweight140 lbs. but not exceeding 147 lbs.64 kg to 67 kg
Super Welterweight147 lbs. to 154 lbs.67 kg to 70 kg
Middleweight154 lbs. but not more than 160 lbs.70 kg to 73 kg
Light Heavyweight160 lbs. to 175 lbs.73 kg to 79.3787 kg
Cruiserweight175 lbs. to 190 lbs.79.3787 kg to 86.1826 kg
Junior Heavyweight190 lbs. to 210 lbs.86.1826 kg to 95.2544 kg
Heavyweight210 lbs. but not more than 230 lbs.95.2544 kg to 104.326 kg
Super Heavyweight230 lbs and above104.326 kg to upwards

Open weight Category

This is a freestyle weight class where fighters from different categories fought each other in an open weight category.

Also, this is not an official weight class for muay thai or any other combat sports.

At an early age, UFC and MMA used to fight in this weight category on a very big weight difference.

That time was a freaking no-holds-barred, full of blood matches with lots of weight differences.

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K-1 has also featured many open weight fights with some fighting legends.

Except Professional Wrestling like WWE, Sumo and Judo use open weight category fights.

In open weight the bigger, heavier, and the tallest fighters get advantages, but against highly skilled, fit fighters get no disadvantage in this type of match.

Rules and Regulations of Muay Thai Weight Classes

  • A fighter must have 100 pounds of weight to compete.
  • A Muay Thai fight cannot start until 3 hours of rest after the weigh-in.
  • Muay Thai fighters must be at least 15 years old to compete in any weight classes.
  • The manager must be the eyewitness of the weigh-in process.
  • Muay Thai fighters must check their physical health from a doctor to clarify they are fit, before the weigh-in.

Cutting Weight

weight cutting
Source: Yokkao

Like most other combat sport muay thai has also made a tradition of weight cut before weigh-in.

Cause Professionals usually weigh heavier than their actual weight, so they cut a lot of water weight before the weigh-in.

After then they rehydrate to gain some pounds before the fight.

In muay thai the legend Saenchai also gave up his weight up to 15lbs. to have an equal fight.

Usually, the weigh-in occurs before the day of the actual fight or sometimes the morning of the fight day.

And it provides approximately 12-24 hrs. to a fighter to regain many weights as possible.

Sometimes fighters didn’t match the same weight during the weigh-in, then they got 3-4 hrs. to cut some excessive weight.

Then they head directly to the sauna or run on a treadmill while putting on a sauna suit.

But in ONE Championship, they use a different type of weight measurement, they do walking weight to determine the perfect weight.

They get checked periodically during their fight training camps, and daily while the fight week, they didn’t want any weight advantage for any of their fighters.

They also check urine samples for proper hydration tests, they just want fair competition.

Side Effects of Weight Cutting

There are also some major effects that a fighter has to suffer after cutting weight.

The weight can affect losing muscle, nausea, stomach problems, and fatigue.

The main physical problems behind the weight loss are dehydration and some long-term effects like damaged kidneys, heart, and some other organs also can affect.

There are also some common mental issues fighters have to go through like mood swings, hormonal imbalances, and also Disorders.

While there’s no clear official long-term report on the weight cutting system because it’s still new but it’s obvious that there are some serious problems behind the weight cutting systems like the most obvious metabolism issue.

The basic height of Muay Thai Fighters

  • Super-Heavyweight (over 230 lbs, 104.5 kg): 6 ft 3 in (190.8 cm)
  • Cruiserweight (up to 200 lbs, 90.7 kg): 6 ft 1 in (186.4 cm)
  • Super-Middleweight (up to 168 lbs, 76.4 kg): 6 ft (180 cm)
  • Lightweight (135 lbs, 61.2 kg): 5 ft 8 in (171.8 cm)


I hope that this article was able to solve your all quires about muay thai weight classes and the weight cutting system.

Thank you for reading this post, and comment down below what do you think about weight classes and the weight cutting system.

Thanks to mmaclan for the height chart…

Image Sources: Facebook

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