What Weight Class Should I Fight At? The Walk-Around Weight Rule

Contents

Fight at the lowest class you can reach while walking around no more than 12–15% above its limit. The ISSN position stand gives that range as the ideal maximum walk-around weight for combat athletes (ISSN, 2025). Then run two more checks: your camp should only need about 0.5–1 kg of loss per week, and the weigh-in rules have to leave you time to recover. If any of the three fails, go one class up.

Most fighters choose a weight class backwards. They pick the class they want and then hope the cut works out. This guide flips it: you start from your own body weight and work forward to the class that fits.

Step 1: Find your real walk-around weight

Your walk-around weight is your average, not your best day. Weigh yourself every morning for two weeks in a normal training period, after the toilet and before food and drink. Take the average.

Your weight can swing by a kilo or more from one day to the next with salt, carbohydrates and training. That’s why one weigh-in tells you little, and a two-week average tells you a lot. Use the average for everything below.

Step 2: Find the lowest class worth considering

Divide your walk-around weight by 1.15 to find the lowest limit worth considering. That’s the 15% end of the ISSN range. Divide by 1.12 for the more cautious 12% end.

Walk-around weight	Lowest limit (15% over)	Cautious limit (12% over)
60 kg / 132 lb	52.2 kg / 115 lb	53.6 kg / 118 lb
65 kg / 143 lb	56.5 kg / 125 lb	58.0 kg / 128 lb
70 kg / 154 lb	60.9 kg / 134 lb	62.5 kg / 138 lb
75 kg / 165 lb	65.2 kg / 144 lb	67.0 kg / 148 lb
80 kg / 176 lb	69.6 kg / 153 lb	71.4 kg / 157 lb
85 kg / 187 lb	73.9 kg / 163 lb	75.9 kg / 167 lb
90 kg / 198 lb	78.3 kg / 173 lb	80.4 kg / 177 lb
100 kg / 220 lb	87.0 kg / 192 lb	89.3 kg / 197 lb

Now look up your sport’s chart and find the classes whose limit is at or above those numbers. A class below the 15% column means you’d walk around more than 15% over it, which is past the ISSN’s ideal maximum.

Example: at 80 kg, the lowest UFC limit you should consider is lightweight, 70.3 kg (155 lb). You’d walk around about 14% above it. Welterweight, 77.1 kg (170 lb), is about 4% above, so the cut would be small. Featherweight, 65.8 kg (145 lb), would put you about 22% over, so it’s off the table.

That 15% figure is a ceiling, not a target. The ISSN describes it as the maximum. If you’re already lean, or you’re new to fighting, choose a class from the cautious column or one class higher.

Step 3: Check the time you have

The class also has to fit the calendar. The ISSN recommends that combat athletes lose about 0.5–1 kg per week during camp. The average camp runs 8–10 weeks (ISSN, 2025).

In the final days before a weigh-in, the ISSN lists body-mass losses of up to about 6.7% at 72 hours, 5.7% at 48 hours and 4.4% at 24 hours as suitable. That’s from glycogen, gut contents and water combined. The ACSM is more cautious about the water part. Fluid losses like those in normal training, e.g. 2–3% of body mass, are likely to have few disadvantages. Relying on more than 3% may have substantial negative effects (Burke et al., 2021).

Put together, the question is simple:

Can camp, at 0.5–1 kg a week, bring you close enough that the last few days only need a small acute cut?

If the answer needs a faster pace, a big water cut or both, the class is too low for the time you have. For the numbers behind each phase, read how much weight you can cut, by days out.

Step 4: Check the weigh-in rules

The time between weigh-in and fight decides how much acute cut you can undo. Reale and colleagues point out that the time available for recovery after the weigh-in determines what degree of acute weight loss can be used and reversed. In Olympic combat sports, weigh-ins happen anywhere from 3 to 24 hours before competing (Reale et al., 2017).

• Day-before weigh-in (most pro MMA and pro boxing): there’s time to refuel, so a small, planned acute cut can be reversed.
• Same-day weigh-in (many amateur events, IBJJF tournaments): there’s little time to recover. The ISSN notes that athletes with same-day weigh-ins, such as in wrestling or jiu-jitsu, may need to rely more on fat loss than on rapid weight loss (ISSN, 2025). Pick a class you’re already close to.
• Repeat weigh-ins and hydration tests (amateur tournaments, ONE Championship): you have to make weight more than once, or prove you’re hydrated. That leaves no room for a water cut, so your walk-around weight has to sit much closer to the limit.

The exact rules for your sport are in our charts: MMA, women’s MMA, boxing, amateur boxing, Muay Thai, kickboxing and BJJ.

Two worked examples

Example 1: 78 kg, 8 weeks out, MMA lightweight (70.3 kg / 155 lb), day-before weigh-in.

Check	Numbers	Result
Walk-around vs limit	78 ÷ 70.3 = 11% over	Under the 15% maximum
Camp pace	78 → 74 kg over 8 weeks = 0.5 kg/week	Inside 0.5–1 kg
Final 72 hours	74 → 70.3 kg = 5.0%	Under the ISSN’s 6.7%

Lightweight works, with some margin. The weekly check-ins need to show the trend heading toward 74 kg.

Example 2: the same fighter, offered a featherweight fight (65.8 kg / 145 lb) on 4 weeks’ notice.

Check	Numbers	Result
Walk-around vs limit	78 ÷ 65.8 = 18.5% over	Past the 15% maximum
Camp pace	Even at 1 kg/week: 78 → 74 kg	Still 8.2 kg to go
Final 72 hours	74 → 65.8 kg = 11%	Far past the ISSN’s 6.7%

All three checks fail. The honest answer is to fight at lightweight or turn the fight down.

Signs you’ve picked the wrong weight class

If the numbers only work with a huge water cut, the class is wrong. Watch for these:

• Off-camp, you sit more than 15% over the limit.
• Your plan relies on losing more than about 3% as water.
• You have to lose faster than 1 kg a week for weeks on end.
• Training falls apart because calories have been too low for too long.
• You’re already lean, and there’s no easy weight left to take off.

Moving up isn’t a step backwards. The ACSM recommends setting a minimum competition weight from body composition before the season starts (Burke et al., 2021). In other words: let your body pick the class, not your ego.

Is a lower weight class better?

Less often than fighters think. The idea is that you’ll be the bigger fighter on the night. But in the studies the ACSM summarises, MMA fighters who cut large amounts showed no clear relationship between how much they lost and whether they won (Burke et al., 2021).

What a big cut reliably does is make camp harder, raise the risks of dehydration and leave less energy for training. Being a little smaller than your opponent costs far less than walking out drained.

Beginners and first fights

• Fight at or close to your normal weight. Your first fights are about learning, not about squeezing into the lowest class.
• Cut little or no water. Many amateur events weigh in on the same day, so there’s barely time to recover anyway.
• If you’re between two classes, pick the higher one. You can always move down later, once you know how your body responds to a camp.
• Under 18? Compete at or near your natural weight, and never use dehydration to make weight.

For the full plan from camp to weigh-in, read how to cut weight for a fight.

Want a quick estimate first? The weight cut calculator shows the weekly pace you’d need and what’s left for fight week.

Important

This guide is general information, not medical advice. The 12–15% range and the fight-week percentages are upper limits for experienced, supervised adults, not targets. Weight classes and weigh-in rules change, so always check your event’s current rulebook. Choose your weight class together with your coach, and pick too high rather than too low, especially for your first fight. Never use diuretics, laxatives, vomiting or heavy sweat suits to make weight. If you’re under 18, have a medical condition or feel dizzy, confused or unwell during a cut, stop and get help.

Frequently asked questions

What weight class should I fight at?

The lowest class you can reach while walking around no more than 12–15% above its limit off-camp, which is the range the ISSN position stand gives as the ideal maximum. Then check that your camp only needs about 0.5–1 kg of loss per week and that the weigh-in rules leave time to recover. If any of the three fails, go one class up.

How much over my weight class should I walk around?

The ISSN position stand puts the ideal maximum walk-around weight at 12–15% above your weight class. For a 70.3 kg (155 lb) limit that is about 78.7–80.8 kg (174–178 lb). Walking around closer to the limit than that is fine and makes every cut smaller.

Is it better to fight at a lower weight class?

Not automatically. Fighters drop down hoping to be the bigger athlete, but a big cut can cost health and performance, and the ACSM's summary of the research found no clear link between how much weight MMA fighters cut and whether they won. A class you can make with a small, planned cut is usually the stronger choice.

What weight class should a beginner fight at?

At or close to your normal weight, with little or no water cut. For your first fights, pick the higher of two possible classes. You learn far more from a fight you enter fresh than from one you enter drained, and under-18s should not use dehydration to make weight at all.

How do I find my walk-around weight?

Weigh yourself every morning for two weeks, after the toilet and before food and drink, in a normal training period. The average of those weigh-ins is your walk-around weight. Your best day is not.

Sources

This guide is based on the works below. Numbers in the text refer to them.

1. Ricci AA, Evans C, Stull C, et al. (2025). International society of sports nutrition position stand: nutrition and weight cut strategies for mixed martial arts and other combat sports
2. Burke LM, Slater GJ, Matthews JJ, Langan-Evans C, Horswill CA (2021). ACSM Expert Consensus Statement on Weight Loss in Weight-Category Sports
3. Reale R, Slater G, Burke LM (2017). Individualised dietary strategies for Olympic combat sports: Acute weight loss, recovery and competition nutrition