When did judo become an Olympic sport?

Men’s judo debuted at the 1964 Tokyo Olympics — the first martial art on the Olympic programme — and has been a permanent fixture since 1972. Women’s judo appeared as a demonstration sport in 1988 and became a full medal event at the 1992 Barcelona Games. A mixed-team event was added at Tokyo 2020, so judo now offers men’s, women’s, and team medals.

How do you score points in Olympic judo?

Under current IJF rules there are two scores. Ippon wins the match instantly — earned by a clean throw largely on the back with control, a 20-second pin, or forcing a submission with a choke or armlock (the opponent taps). Waza-ari is a lesser score for a smaller throw or a 10-to-19-second pin, and two waza-ari add up to ippon. Penalties, called shido, are given for passivity or rule-breaking.

What are the judo weight classes at the Olympics?

There are seven weight classes per gender. For men: under 60, 66, 73, 81, 90, and 100 kg, plus over 100 kg. For women: under 48, 52, 57, 63, 70, and 78 kg, plus over 78 kg. Grouping athletes by weight keeps matches fair, since judo rewards technique and timing over sheer size.

Why do judo players wear blue and white?

In elite competition one athlete wears a white judogi and the other a blue one, so referees, spectators, and cameras can tell them apart instantly. The blue gi was introduced to top international judo in the 1990s and appeared at the Olympics from 2000. In everyday club practice, white remains the traditional colour.

How can I compete in judo in the USA?

Start at a local dojo, join the national governing body (USA Judo), and enter local and regional tournaments in your age and weight division. From there the pathway runs through national events to the national team and the international IJF circuit. You do not have to compete to enjoy judo — but if you catch the bug, the ladder to the top is clearly laid out.

Olympic judo explained

Judo is more than a great workout and a wonderful skill — it is an Olympic sport, one of only a handful of martial arts on the Games programme, and the throws you learn at a local club are the same ones you will see on the Olympic mat. Whether you are watching for the first time or dreaming a little for yourself or your child, here is a friendly guide to how Olympic judo works: its history, the rules, scoring, weight classes, the famous blue and white judogi, and the pathway that starts at a dojo near you.

The short version: Olympic judo is governed by the International Judo Federation (IJF). Two athletes face off on a mat and try to score by throwing, pinning, or submitting each other. A decisive score — ippon — ends the match at once; a lesser score is a waza-ari, and two of them make an ippon. Athletes compete in seven weight classes each for men and women, one in a white judogi and one in blue. It is fast, dramatic, and deeply technical — and every bit of it grows from the fundamentals taught in beginner classes.

Judo at the Olympics

Judo made history at the 1964 Tokyo Olympics as the first martial art ever added to the Games — a proud homecoming in the country where Jigoro Kano founded the sport at the Kodokan in 1882. After a brief absence it returned for good in 1972. Women’s judo followed as a demonstration sport in 1988 and became a full medal event at the 1992 Barcelona Games, and a mixed-team event joined the programme at Tokyo 2020. Today judo is one of the most widely practised sports on earth, contested by athletes from well over a hundred nations at each Olympics.

How a match works

A judo contest takes place on a square mat with a clearly marked competition area. The two athletes bow, step on, and begin standing. Much of the early action is grip fighting (kumi-kata) — each judoka trying to secure the sleeve-and-lapel grips that let them attack — before launching throws, defending, and countering. If the action goes to the ground, they can continue with pins, chokes, and armlocks until the referee either awards a score or stands them back up. A single referee on the mat manages the contest, supported by video review. Senior matches run for a set time (currently four minutes), and the moment someone scores ippon, it is over.

Scoring: ippon and waza-ari

Modern IJF judo has a clean, two-tier scoring system, which makes it surprisingly easy to follow:

Ippon — the instant win. You score ippon three ways: throwing your opponent largely onto their back with control and force; pinning them for 20 seconds (osaekomi); or forcing a submission with a choke or armlock, at which point they tap to concede. Ippon ends the match immediately — it is judo’s knockout.
Waza-ari — a half-score. Awarded for a throw that just misses the mark for ippon, or a pin held for 10 to 19 seconds. Crucially, two waza-ari combine into an ippon and end the contest, and a single waza-ari can be enough to win if no one scores higher by the end.

That is the whole scoreboard. The emphasis on the clean, decisive throw is exactly what makes judo so thrilling to watch — a match can end in a heartbeat with one perfect technique. Curious which throws score those ippons? Our judo throws guide breaks down the families and the signature techniques.

Penalties and golden score

To keep matches active and safe, referees hand out shido (penalties) for things like stalling, avoiding grips, or breaking the rules. Collect three shido and you lose the match. A serious rules infraction can bring an outright disqualification (hansoku-make). If the clock runs out with the scores level, the match goes to golden score — sudden-death overtime where the first score, or the opponent’s next penalty, wins. It can produce some of the most tense, dramatic finishes in all of sport.

Weight classes

Because judo rewards timing and technique over brute size, athletes compete within weight classes so matches stay fair. The Olympics use seven per gender:

Men	Women
−60 kg	−48 kg
−66 kg	−52 kg
−73 kg	−57 kg
−81 kg	−63 kg
−90 kg	−70 kg
−100 kg	−78 kg
+100 kg	+78 kg

This is great news for beginners of every size: judo is built so that a smaller, quicker athlete can absolutely thrive against a bigger one within their division.

The blue vs white judogi

Watch any Olympic judo match and you will see one athlete in a white judogi and the other in blue. The reason is simply clarity — the contrasting colours let the referee, the crowd, and the cameras track two grappling athletes at a glance. The blue gi was introduced to top-level international judo in the 1990s and has featured at the Olympics since 2000. In everyday club practice, the traditional white judogi is still the norm; we cover what to wear in the judogi guide.

Champions to know

Part of what makes judo inspiring is its people. American fans rightly celebrate Kayla Harrison, who in 2012 became the first US athlete ever to win Olympic gold in judo and defended her title in 2016 — a story of resilience as much as talent. France’s Teddy Riner is one of the most decorated heavyweights in history, a multiple Olympic and World champion who became a household name. And Japan, judo’s birthplace, remains a perennial powerhouse that sets the standard on the mat. These champions all began exactly where you can — learning ukemi and their first throw at a local club.

The USA Judo pathway

If competition ever appeals, the road is clearly marked. In the United States it runs through USA Judo, the national governing body, alongside the USJA and USJF:

Train at a club and build your fundamentals and belt grade.
Join USA Judo for competition insurance and rank registration.
Enter local and regional tournaments in your age and weight division — there are youth, cadet, junior, and senior brackets.
Move up through national championships toward the national team and the international IJF World Tour, which is the springboard to the Olympics.

Most judoka never chase a medal, and that is completely fine — but it is genuinely inspiring that the same sport welcomes a nervous first-timer and crowns Olympic champions. Explore dojos with an Olympic-style program or a shiai competition team if that is your dream.

How to start

You do not need to be an athlete, and you certainly do not need to compete — you just need to step on the mat. Most dojos offer a free trial or intro class so you can try judo with zero pressure, and a beginners program will teach you to fall safely and land your first throw at your own pace. Curious how judo compares to its close cousin? Read judo vs BJJ. Ready to find a club? Browse the best-rated dojos, search by state, or look at kids judo for the youngest future Olympians. All levels welcome — really.

Common questions

When did judo become an Olympic sport?: Men’s judo debuted at the 1964 Tokyo Olympics — the first martial art on the Olympic programme — and has been a permanent fixture since 1972. Women’s judo appeared as a demonstration sport in 1988 and became a full medal event at the 1992 Barcelona Games. A mixed-team event was added at Tokyo 2020, so judo now offers men’s, women’s, and team medals.
How do you score points in Olympic judo?: Under current IJF rules there are two scores. Ippon wins the match instantly — earned by a clean throw largely on the back with control, a 20-second pin, or forcing a submission with a choke or armlock (the opponent taps). Waza-ari is a lesser score for a smaller throw or a 10-to-19-second pin, and two waza-ari add up to ippon. Penalties, called shido, are given for passivity or rule-breaking.
What are the judo weight classes at the Olympics?: There are seven weight classes per gender. For men: under 60, 66, 73, 81, 90, and 100 kg, plus over 100 kg. For women: under 48, 52, 57, 63, 70, and 78 kg, plus over 78 kg. Grouping athletes by weight keeps matches fair, since judo rewards technique and timing over sheer size.
Why do judo players wear blue and white?: In elite competition one athlete wears a white judogi and the other a blue one, so referees, spectators, and cameras can tell them apart instantly. The blue gi was introduced to top international judo in the 1990s and appeared at the Olympics from 2000. In everyday club practice, white remains the traditional colour.
How can I compete in judo in the USA?: Start at a local dojo, join the national governing body (USA Judo), and enter local and regional tournaments in your age and weight division. From there the pathway runs through national events to the national team and the international IJF circuit. You do not have to compete to enjoy judo — but if you catch the bug, the ladder to the top is clearly laid out.