What weight class am I in for BJJ? (IBJJF + ADCC)

The short answer: how divisions are defined

Your weight class in BJJ is simply the division your competition weight falls into, but two details make it less obvious than it sounds. First, the divisions differ by ruleset — IBJJF and ADCC use different classes. Second, and most importantly for IBJJF, the weight that counts is measured with your gi on, not your bare bodyweight.

So ‘what weight class am I?’ has two parts: which ruleset are you competing under, and what do you weigh under that ruleset's conditions? Answer both and your division is straightforward. Skip the gi detail for IBJJF and you can miscalculate badly, showing up expecting one class and missing weight for it.

The rest of this guide lays out the divisions for each ruleset and the mistakes to avoid. If you'd rather just get your answer, our weight class finder takes your gi-on weight and returns your IBJJF division instantly.

The IBJJF gi-on rule

The rule that catches the most people out is that IBJJF weigh-ins are done in your full gi, and the published division limit already includes it. You step on the scale wearing your jacket, pants, and belt, and that total — body plus gi — must be under the limit. There's no subtracting the gi's weight afterward.

This matters because a gi weighs a meaningful amount — anywhere from roughly 1.3 to 2 kilograms depending on its weave and size. That's often the difference between two divisions. Someone who calculates their class from bare bodyweight, then adds a heavy gi at weigh-in, can find themselves over the limit for the class they trained for.

The practical takeaway is to always weigh yourself at home in your actual competition gi before the event. That gi-on number is the one that counts, and knowing it in advance — with a little margin — is how you avoid a same-day disaster. If you're near a limit, a lighter gi shaves grams off the scale without any cutting.

IBJJF adult divisions

IBJJF runs a full set of tightly-spaced divisions for adults, measured with the gi on. The men's and women's classes are laid out in the table below, from the lightest — Rooster — up through the heaviest open classes. These are the adult gi limits; the same division names are used across belts, though junior, masters, and kids brackets have their own structures.

Notice how close together the divisions are, especially in the middle. Small differences in bodyweight, or in gi weight, can move you between adjacent classes, which is exactly why the gi-on measurement matters so much. A couple of hundred grams can decide your division.

These are the figures our tools and our competition reference use, drawn from the IBJJF rule book. Always confirm against the current official rule book before you compete, since governing bodies can adjust limits between editions.

IBJJF adult gi weight divisions

Limits are measured with the gi on. Confirm against the current IBJJF rule book before competing.

ADCC and no-gi divisions

If you're competing no-gi at an ADCC-style event, the picture is different in two ways. First, you weigh in without a gi, so the gi-on complication disappears entirely — it's just your bodyweight against the limit. Second, ADCC uses far fewer, broader divisions than IBJJF: historically five for men and three for women, with much larger gaps between them.

Those broader divisions change the calculus. With wide gaps between classes, the weight-cutting decisions differ from IBJJF's finely-sliced brackets, and there's often more size variation within a single ADCC division. ADCC also weighs in the day before, which allows a different approach to making weight than IBJJF's same-day format.

Our ADCC weight class finder covers those no-gi divisions, and our IBJJF vs ADCC comparison explains how the two rulesets differ in scoring, weigh-ins, and legal techniques — all of which matter once you know your division.

Where people miscalculate

The single biggest miscalculation is forgetting the gi at IBJJF. People weigh themselves in shorts, find a class, and never account for the one to two kilograms the gi adds, only discovering the problem on the scale at the event with no time to fix it. Weighing in your competition gi ahead of time eliminates this entirely.

A second common error is assuming your bodyweight is stable when it fluctuates day to day — by food, water, and time of day. The number that matters is your weight in your gi at the moment of weigh-in, so build a little margin rather than aiming to hit the limit exactly, since a normal fluctuation can push you over.

A third is mixing up rulesets — using an IBJJF division for an ADCC event or vice versa. The divisions and weigh-in conditions differ, so always match your class to the specific event you're entering. Confirming the event's ruleset before you plan your weight is a two-minute check that prevents a wasted entry.

Kids, juvenile, and masters

Adults aren't the only competitors, and the division picture extends across ages. Juvenile competitors (16–17) and the various kids' brackets have their own weight classes, generally following the same gi-on principle at IBJJF but with age-appropriate limits. Masters divisions — for competitors 30 and up, in five-year bands — use the adult weight classes but are separated by age.

So a masters competitor picks their weight class exactly as an adult does, then competes within their age band rather than against the open adult field. The weight divisions themselves don't change with age at the masters level; only the bracket you're placed in does. Your age division is a separate question from your weight class.

If you need to sort out which age bracket you fall into, that's determined by the age you turn during the competition year, and our age division calculator handles it. Weight class and age division together define exactly where you'll compete.

Should you cut to a lower class?

Once you know your division, a natural question is whether to cut to a lower one. For most competitors, especially first-timers, the answer is no. Competing near your walking weight keeps you fresh and strong, whereas cutting to a lower class — particularly for IBJJF's same-day, gi-on weigh-in with no rehydration window — risks arriving depleted for a marginal size advantage.

If you do consider cutting, do it gradually and account for the gi, and be honest about whether the lower class is reachable at a safe rate. A lighter competition gi is often a smarter first lever than dehydration, since it drops scale weight without touching your body. Our guide to cutting for a same-day weigh-in covers how to do it properly.

The honest default, though, is to enter the division your gi-on weight already fits and spend your energy on your jiu-jitsu rather than the scale. Knowing your natural division is usually the end of the story, not the start of a cut.

Find your division

Put it together: identify your ruleset, weigh yourself under its conditions — in your gi for IBJJF, without one for ADCC — and match that number to the division table, with a little margin. That's your weight class, no surprises. The gi-on detail is the one that trips people up, so weigh in your actual competition gi ahead of time.

Our weight class finder returns your IBJJF gi-on division in seconds, and the ADCC finder covers no-gi. For the full breakdown of every division, our IBJJF weight classes guide and data reference lay them all out. Know your number, and registration becomes a formality.