Judo's belt system is the template that most modern martial arts copy. Jigoro Kano, judo's founder, introduced the black belt in the 1880s as a way to mark advanced students at the Kodokan, and the kyu/dan structure he formalized spread through karate, taekwondo, aikido, and dozens of other arts. Understanding judo's system is therefore the closest thing to understanding the original logic of martial arts ranking.
The kyu grades
Judo divides students into two phases: kyu grades for pre-black-belt students, and dan grades for black belts. The kyu system counts downward — a beginner is 6th kyu (or sometimes 9th or 10th, depending on the federation), and works toward 1st kyu, the rank immediately below black belt.
The most common adult kyu structure in Western federations is:
- 6th kyu: white belt
- 5th kyu: yellow belt
- 4th kyu: orange belt
- 3rd kyu: green belt
- 2nd kyu: blue belt
- 1st kyu: brown belt
The Kodokan itself, in Japan, traditionally uses a simpler structure: white belt for the higher kyu grades and brown belt for 3rd, 2nd, and 1st kyu. The colored-belt progression is largely a Western adaptation introduced in the early 20th century to give students more frequent milestones.
At each kyu, students are assessed on three pillars: waza (technique — throws, holds, escapes, transitions), shiai (competitive ability under live conditions), and kata (the formal prearranged sequences that preserve judo's technical core). The balance of these three shifts by federation. The British Judo Association, for example, emphasizes kata at higher kyu grades; many American federations weigh shiai more heavily; the Kodokan expects strong performance in all three.
The dan ranks
Judo recognizes ten dan ranks. The visual signaling changes as you climb:
- 1st through 5th dan: black belt
- 6th through 8th dan: red-and-white paneled belt (worn on formal occasions; black is acceptable for training)
- 9th and 10th dan: solid red belt
Few judoka outside Japan ever see a red belt in person. Only fifteen people in judo's entire history have been promoted to 10th dan by the Kodokan, and the IJF has historically been even more conservative.
Kodokan, IJF, and national federations
Judo's rank politics are real. The Kodokan in Tokyo is judo's spiritual home and the original certifying body; a Kodokan-issued dan grade carries unique weight. The International Judo Federation (IJF) governs international competition and has its own promotion criteria, weighted toward competitive results. National federations — the BJA in Britain, USA Judo and USJF in America, the FFJ in France — each maintain their own grading syllabi, and ranks do not always transfer cleanly between them. A 2nd dan from one federation may be asked to test or pay a registration fee to be recognized by another.
For most students this matters only at higher ranks, but it is worth knowing early. If you anticipate moving countries or competing internationally, ask your instructor which federation your grade will be registered with.
What shodan actually represents
In judo, shodan — first dan, the first black belt — is explicitly understood as a beginning, not an ending. The character sho means "first" or "beginning," and Kano framed the rank as the point at which a student has demonstrated they understand the fundamentals well enough to start serious study. A shodan is expected to throw cleanly, hold cleanly, escape competently, perform Nage-no-Kata to standard, and demonstrate basic teaching ability. They are not expected to be a finished judoka. That comes much later, if at all.
This framing — black belt as the start of the real curriculum — is one of judo's most influential cultural exports. Almost every modern martial art that uses the dan system inherits this idea from Kano, whether or not its practitioners remember the source.
The red-and-white belt (6th-8th dan)
The kohaku obi, or red-and-white belt, marks the rokudan through hachidan grades. It is worn for ceremonies, demonstrations, and formal teaching contexts, while a standard black belt is often worn for daily training. Promotion to these ranks typically requires decades of teaching, contribution to the art, and in some federations, the production of original technical or pedagogical work. Competition results matter less and less at this level; service to judo matters more.
The red belt (9th-10th dan)
The solid red belt — kudan and judan — is essentially a lifetime achievement rank. The Kodokan has awarded 10th dan to only fifteen judoka in over a century. Promotions are typically made late in life and recognize a body of work spanning fifty or sixty years of contribution to the art. Most national federations have never had a living 10th dan.
A realistic timeline
For a committed adult training two to three times a week, reaching shodan typically takes four to six years. From there, dan promotions slow dramatically: nidan often requires two years at shodan, sandan three years at nidan, and so on. Reaching godan (5th dan) typically takes twenty years of post-shodan training. Beyond that, time-in-grade requirements lengthen further and grading shifts away from physical performance toward teaching, refereeing, and contribution to the federation.
The belt is a record, not a destination. The most respected judoka in any dojo are usually the ones who have stopped worrying about the next promotion.