How to Tie a BJJ Belt (and Make It Stay Tied)
Your gi arrives, the belt is folded on top of it, and nobody ever sits you down and explains the knot. So you improvise in the changing room, walk out, and it falls apart somewhere in the first five minutes. That is an extremely normal white belt experience, and it is almost always the same handful of small mistakes causing it. Here is the simple knot, the reasons yours keeps coming undone, the version that actually holds through a hard round, and the few belt questions that come up right after you finally get it tied.
The Simple Knot, Step by Step
Start with your jacket closed and the lapels crossed the way you want them, because the belt is what holds that in place. Then:
1. Find the middle of the belt and hold it flat against your stomach, right around your belly button.
2. Take both ends around your back, cross them behind you, and bring them back to the front. Keep the layers flat and untwisted as you go, since a twisted wrap is one of the reasons a knot slips later.
3. Even up the two tails so they hang about the same length. If one is much longer than the other, fix it now rather than after the knot is tied.
4. Take one tail, pass it up underneath both layers of belt, and pull it through so it sits on top.
5. Cross that top tail over the bottom one, tuck it up through the loop you just made, and pull both ends out sideways rather than down.
Done right, the knot sits flat and horizontal against your stomach with both tails pointing out to the sides. It gets described as a fortune cookie shape, which is a good enough description that you will never unsee it. If your tails end up pointing up and down instead, you crossed the last step the wrong way. Untie it, reverse that cross, and it will sit correctly.
Here is the whole thing at normal speed, which is worth watching once before class rather than working it out on the mat with everyone waiting.
Gi pants tie a different way entirely, and tying a belt on someone else reverses the whole orientation. We covered both, with video for each, in our step by step guide to tying your gi pants and belt.
Why Your Belt Keeps Coming Undone
If you are retying three times a class, it is usually one of these four things.
The first wrap was loose. A belt that starts with slack in it has room to travel during a scramble, and once it travels, the knot loosens on its own. Pull the wraps snug before you tie anything.
The tails were uneven. Off center wraps and mismatched ends make it hard to seat the knot properly, and a knot that is not seated properly is a knot that comes apart.
You tied a single knot. One pass has very little to bite against once somebody is gripping your lapel and driving into you. This is the big one, and it has a simple fix in the next section.
You tied it too loose on purpose. Plenty of beginners do this because a tight belt feels restrictive at first. Aim for the middle: tight enough to hold through a scramble, loose enough that your hips and your breathing still work normally.
The Knot That Actually Holds
The fix most people need is the double knot, which means repeating that cross and tuck a second time before you pull everything tight. It takes about two extra seconds and it is the single biggest difference between a belt that survives a round and a belt you are constantly fixing.
There are also locking variations floating around, usually called the super lock or the lock knot, which add an extra pass back through both layers of belt before the final tuck so the knot has more to bind against. They hold extremely well. They also cinch down hard, so the first time you tie one, expect it to feel tighter than you are used to. Try it on a day when you have a minute to adjust rather than thirty seconds before class starts.
What the Rules Actually Ask For
If you never compete, none of this is binding, but it is a useful description of what a correctly worn belt looks like. The IBJJF uniform requirements call for a durable belt 4 to 5 cm wide, colored to your rank with a black tip, except at black belt where the tip is red or white. The belt is worn over the jacket, wrapped around the waist twice, and tied in a double knot tight enough to hold the jacket closed. Once tied, each end should hang 20 to 30 cm, which is roughly 8 to 12 inches.
Notice that the double knot is not a preference there, it is the actual requirement. That should tell you something about how the single knot performs under pressure.
Which Side Does the Black Bar Go On?
This one comes up constantly, and the honest answer is that there is no universal rule. The rank bar ending up on the left is the more common tradition, but plenty of academies do it the other way, and the IBJJF uniform requirements say nothing about which side it lands on. What matters far more is your own gym's habit, so watch what the upper belts do or just ask your professor. Nobody will think less of you for asking, and it is a much shorter conversation than quietly wondering about it for a year.
As for where the left-side habit came from, one theory traces it back to the samurai, who wore their swords on the left hip so the right hand could draw cleanly across the body. Keep your rank on the sword side, the story goes, and the tradition rode along as the Japanese arts evolved into judo and eventually into jiu jitsu. Nobody can prove it, and it gets repeated more often than it gets sourced, but it is a fun answer to have in your pocket the next time someone asks at open mat.
Getting a Belt That Actually Fits
Belt sizing is mostly about length, and the numbers are less mysterious than they look. Our own CYA belt runs from A0 at 240 cm, or 94.5 inches, up to A4 at 320 cm, or 126 inches, with roughly 20 cm between each size. Most brands use a similar scale, though the exact lengths vary, so check the chart wherever you buy.
The 20 to 30 cm tail rule above is a handy way to judge fit once you have one on. If your ends dangle well past your hips, the belt is longer than you need and it will get in the way. If you are struggling to get a double knot tied at all, it is too short. And if you are between sizes, keep in mind that a cotton belt shrinks a little with washing, which brings us to the part that people argue about.
Yes, You Should Wash It
There is an old superstition, inherited from judo and the traditional martial arts, that washing your belt washes away the knowledge in it. It is a nice story. It also predates anybody understanding how bacteria and fungi colonize warm damp fabric, and your belt spends every class pressed against sweaty bodies and the mat. Ringworm and staph are real and genuinely miserable, and the sewn ridges on a belt are a good place for that stuff to live. Wash it.
Cold water, a gentle cycle, and hang drying is the safe default. Heat is what shrinks cotton and wrecks the fabric, so the dryer stays out of it. If you have taped stripes on your bar, be aware that tape can loosen or come off in the wash, which is worth knowing before it happens rather than after. Our guide to washing your gi covers the same principles in more detail, and they apply to the belt too.
One Small Etiquette Note
When your belt does come undone in the middle of class, and it will, step off to the side or turn away from the instructor and the group to retie it rather than doing it front and center. It is a small courtesy, it keeps the room's attention where it belongs, and noticing details like that is a big part of what makes a new student feel like they belong quickly.
That is the whole thing. Wrap it snug, even the tails, double knot it, pull sideways, and get on with training. If you have a first class coming up, our guide to what to expect from your first BJJ class covers everything else nobody thinks to tell you beforehand. See you on the mats.
