Bjj Gi Size Guide

BJJ Gi Sizing Is Mostly Guesswork Until It Isn't

Most people buy a gi based on their height and hope for the best. That approach works about half the time, and the other half you end up wearing a jacket that looks like a tent or a kimono someone lost forty pounds in. The actual process is better than that if you take fifteen minutes with a tape measure instead of scrolling through size charts hoping something fits. A BJJ gi isn't one measurement. It's at minimum three: jacket length, sleeve length, and pants inseam. Some brands add chest circumference or thigh opening width to the mix, but the first three are what actually determine whether you can move or if the gi is moving you. Jacket length is measured from the top of your shoulder seam down to where you want the hem to hit — somewhere between mid-thigh and just above the knee for most people. Sleeve length runs from the shoulder seam to your wrist bone when your arm is hanging straight down. Pants are straightforward: inseam from crotch to ankle, plus waistband adjustment range.

Using a Bjj Gi Size Guide Without Getting It Wrong

Here's how to actually use a size chart rather than just matching your height to the nearest row. Find the brand's chart, then measure yourself first before you look at it. Lay a measuring tape at the highest point of your shoulder and run it down your arm to your wrist bone. Do the same for jacket length starting at that same shoulder point and going down your side to your desired hem length. Measure your inseam while wearing shoes you'd actually train in, since BJJ shoes add roughly half an inch to effective leg length. Write those numbers down. Then look at the chart and match your measurements to the column where every single dimension falls comfortably within the range, not the row where your height lands closest. The chart will give you something like A2 or C1. That's standard. The letter is the cut category — A being shorter and wider, C being longer and narrower, with B sitting in the middle. The number is the size within that cut. An A2 jacket is still a different shape than a C2 jacket even though both might list "fits 5'7\"" on the front page. This is where most people mess up. They see their height on two different rows and pick the cheaper one without checking the actual sleeve and torso measurements listed underneath. Every brand does this slightly differently. Fuji, Venum, Tatami, Sanabul, and Atos all use their own sizing logic. Fuji tends to run boxy and generous in the torso. Venum skews slimmer in the shoulders and sleeves. Tatami sits somewhere in between. Sanabul is budget-friendly but the cuts are less consistent between colorways of the same model. Atos is competition-grade and runs notably tighter across the board. None of this shows up on the size chart. You learn it by buying too many gis and noticing the pattern.

Pants sizing works the same way — match your inseam and waist, not just your height. A person who is 5'9" with a 32-inch inseam and another who is 5'9" with a 36-inch inseam need different pants, and the chart will tell you that if you actually look at the inseam column instead of just the height row. Some people also need to check the knee and thigh measurements if they have larger legs, because a slim-cut gi will rip at the knees during guard passing regardless of how well the rest of it fits. I ran into this exact problem last year. I ordered a Fuji A2 based on my height of 5'10" and my chest measurement. The jacket fit fine, the pants were okay. The sleeves were four inches too short. When I sat in guard or pulled half-guard, my forearms were completely exposed because the sleeve hem rode up past my elbow. I checked the chart again and my actual arm length was 26 inches from shoulder to wrist, which the A2 sleeve measurement of 24 inches couldn't accommodate. I should have measured my arm first and matched that number to the sleeve column instead of letting the height row decide for me. I ended up switching to an A3, which added two inches to the sleeve and an inch to the jacket length. The trade-off was the jacket ran a touch long in the torso, but that's easier to manage with a tightened belt than sleeves that expose your arms to mats burn and grip attacks. Another thing nobody puts on the chart: shrinkage. Cotton gis shrink. A pre-shrunk cotton or cotton-blend gi will still shrink maybe three to five percent after the first few washes if you machine dry them. That means a jacket that fits perfectly out of the bag might become half a size tighter after three wash cycles. The sleeves shrink first because they're narrow fabric tubes. The torso shrinks next. Pants shrink across the waist and inseam. If you're between sizes, size up. An A3 that feels slightly roomy now will likely fit an A2 perfectly after shrinkage, whereas an A2 that fits perfectly now might become uncomfortable afterward.

Competition gis have a different problem. IBJJF rules require jacket sleeves to end between the wrist bone and the tip of the middle finger, and pants to end between the ankle bone and the toe. A competition gi that meets those specs at your current weight might fail inspection at a lower weight if the sleeves grow relatively longer as your body compresses. I've seen people get caught on this at trials because they sized for a heavier weight class and then couldn't pass inspection after cutting weight. The workaround is simple: try on the gi with your sleeves and pants at the exact lengths you'd compete in, raise your arms overhead, and make sure the sleeve hem stays below your wrist bone throughout the motion. If it rides above the wrist when your arm is extended, it's too short for IBJJF compliance regardless of what the chart says. For gi bottom sizing, the waistband stretch range matters more than the chart implies. Most BJJ gi pants have an elastic waistband with a drawstring. The chart will list a waist range like 28-32 inches for a given size, but that range assumes you're wearing a thick belt and heavy rash guard underneath. If you train in light gear most of the time, you might find the waistband too loose even at its tightest setting, which causes the pants to sag during rolling and becomes a distraction. Some people solve this by adding a second lighter drawstring or by getting the pants tailored at the waist, though tailoring a gi is unusual and most people just accept the sag or swap to a smaller size and live with tighter thighs. The honest limitation here is that no size guide covers every body type. Tall and narrow builds struggle with A-cut gis because the torso ends up too wide. Short and stocky builds struggle with C-cut gis because the sleeves and jacket length are awkward even if the waist fits. Athletic builds with broad shoulders and narrow waists often find that the shoulder width fits an A3 but the waist requires an A2, and there's no hybrid size that exists. In those cases the common workaround is picking the size that fits your largest measurement and accepting some excess fabric elsewhere, because a gi that's too small everywhere is unusable and a gi that's slightly loose in one area is just a gi that requires a tighter belt.

If you're buying online and can't try anything on, order two adjacent sizes and return the one that doesn't work. Most reputable retailers handle gi returns without issue as long as the tags are still on and there's no smell or mat residue on it. The cost of return shipping is almost always less than the cost of keeping a gi that fits poorly for six months and training in something uncomfortable.