Making weight for judo is not just about passing the official scale. At IJF events, you weigh in the day before competition, then you may face a random weigh-in that limits how much weight you can regain to 5% above your category maximum. IJF Sport and Organisation Rules The best approach is to reach your category through steady weight management, then recover without putting yourself over that limit.
How does a judo weight cut work?
A judo weight cut is the process of getting your body weight within your competition category. You want to make the scale while keeping enough energy to grip, throw, defend and think clearly on the mat.
The challenge is that passing the official weigh-in does not always mean your weight checks are finished.
For an IJF athlete, the process looks like this:
- Before the event: Work toward your chosen weight category through regular meals, training and gradual weight loss if needed.
- Official weigh-in: Report to the scale and confirm that your weight is within your category.
- After the scale: Eat, drink and recover while staying within the allowed weight regain limit.
- Competition day: Be ready for a possible random weight check before your contests.
The space between the official weigh-in and your matches gives you time to recover. But that recovery has limits.
You cannot assume you can weigh much more on competition day than you did at the official check.
This changes how you should plan your cut. Instead of trying to reach the lowest possible number through dehydration, aim to arrive close to your category weight while still feeling healthy and ready to compete.
A successful cut should leave you prepared for judo, not just prepared for a scale.
What are the IJF official weigh-in rules?
The IJF has specific procedures for the official weigh-in. These apply to the international events covered by its Sport and Organisation Rules.
The main requirements are:
- Official weigh-in time: 16:00 local time on the day before competition
- Official weigh-in window: 30 to 60 minutes
- Unofficial weigh-in: Opens 40 minutes before and closes 10 minutes before the official weigh-in
- Unofficial checks: Unlimited attempts on the official scales
- Clothing: Only underclothing at the official weigh-in
- Official attempts: A single time on the scale
- Weight recording: To one decimal place, such as 51.9 kg
- Outside category limits: DSQ, meaning exclusion from competition
- Hotel test scales: Calibrated scales available daily from 08:00 to 22:00
The unofficial check is especially useful. It lets you see your weight on the competition scales before your official result is recorded.
Use that opportunity to confirm where you stand. Do not treat it as an invitation to make a dangerous last-minute adjustment.
Rule check: The official weigh-in is a qualification requirement, not a practice session. If your weight falls outside your category limits, you cannot simply try again later.
Scale readings may also differ slightly between devices. Use the available test scales to understand your weight rather than relying only on a reading from home.
Before traveling, check your event schedule, weigh-in location and instructions. Give yourself enough time to arrive without rushing.
For a wider comparison of weigh-in timing across combat sports, see same-day vs. day-before weigh-ins.
How does the IJF random weigh-in and 5% limit work?
Making your official weight is not always the final check.
Rule check: For IJF World Judo Tour individual events, the random weigh-in opens one hour before competition each day, with four athletes drawn per category except the plus categories; selected athletes must arrive at least 30 minutes or six contests before their first contest, and anyone exceeding the 5% allowance above their category maximum cannot compete. IJF Sport and Organisation Rules
IJF senior random weigh-in limits
The following table shows the official category and its maximum permitted weight at the random check.
| Women’s category | Random weigh-in maximum | Men’s category | Random weigh-in maximum |
|---|---|---|---|
| -48 kg | 50.4 kg | -60 kg | 63.0 kg |
| -52 kg | 54.6 kg | -66 kg | 69.3 kg |
| -57 kg | 59.9 kg | -73 kg | 76.7 kg |
| -63 kg | 66.2 kg | -81 kg | 85.1 kg |
| -70 kg | 73.5 kg | -90 kg | 94.5 kg |
| -78 kg | 81.9 kg | -100 kg | 105.0 kg |
These are the senior limits for the listed categories, not a universal rule for every judo event.
The practical lesson is simple: you need to think about your weight after the official check, not just before it.
You may not be selected for a random weigh-in. But you should prepare as though you could be.
Do not build your competition plan around avoiding the check.
For local, school or other competitions, always read the organizer’s rules. The weigh-in procedures may differ from those used on the IJF World Judo Tour.
Why does the random weigh-in limit big weight cuts?
The random check reduces the benefit of losing a large amount of water to make your category and then trying to regain it all before competing.
That matters because rapid weight loss can carry serious health risks.
A 2012 JISSN review describes how 22-year-old judoka Chung Se-hoon was found dead in a sauna in 1996 while cutting weight toward the 65 kg category ahead of the Atlanta Olympics. JISSN review
The same review reports that athletes losing more than 5% of body mass had a higher probability of injury during competition, while rapid weight loss can impair physical and cognitive performance and increase the risk of death. JISSN review
For judo, that can affect the skills you depend on during a contest.
You need to react to attacks, make decisions under pressure, maintain your grip and control your body during throws.
A poorly managed cut can work against those goals.
Safety: Do not use saunas, sweat suits, plastic or rubber clothing, spitting, diuretics, laxatives, vomiting or fasting to force your weight down. These are dangerous shortcuts, not sensible competition preparation.
Do not deliberately restrict water to manipulate the scale.
Your objective should be to reach a suitable weight category while maintaining your ability to train and compete.
If getting to your chosen class requires extreme measures, reconsider the class.
How fast should you lose weight before a judo competition?
A gradual approach gives you more control over your weight, meals, training and recovery.
The 2025 International Society of Sports Nutrition combat sports position stand notes a common fight-camp weight loss target of 0.5 to 1 kg, about 1.1 to 2.2 lb, per week, and advises that intake during weight descent should not fall below 3.0 to 4.0 g/kg of carbohydrate, 1.2 to 2.0 g/kg of protein, or 0.5 to 1.0 g/kg of fat per day. ISSN position stand
These figures are sports nutrition guidance, not a personal prescription. Your needs depend on your training, development, health and starting weight.
Build your food plan around normal meals:
- Protein: Include foods such as eggs, fish, chicken, yogurt, beans or tofu.
- Carbohydrates: Use foods such as rice, potatoes, oats, bread and fruit to support training.
- Fats: Include regular sources such as olive oil, nuts and other foods you enjoy.
- Fluids: Drink normally and pay attention to your needs during training.
- Consistency: Keep eating patterns predictable rather than swinging between overeating and severe restriction.
Avoid skipping meals to chase a scale reading.
If you are still growing, work with a parent, coach and qualified sports dietitian before attempting intentional weight loss.
Do not copy another judoka’s weight cut. Their body, category and training demands may be different from yours.
What should you eat and drink after a judo weigh-in?
After making weight, your priorities shift toward hydration, carbohydrate intake, comfortable digestion and competition readiness.
The time between the scale and competition affects how much recovery is possible.
A review by Reale, Slater and Burke explains that Olympic combat sport weigh-ins can occur from 3 to 24 hours before competition, and that the available recovery time determines how much acute weight loss can be reversed. Research review
For judo, recovery needs an extra consideration: your weight must remain within the applicable random weigh-in limit.
Start with fluids and electrolytes
The 2025 ISSN position stand prioritizes oral rehydration solutions at 1 to 1.5 L per hour, about 34 to 51 fl oz per hour, immediately after weigh-in, followed by fast-acting carbohydrates at a tolerable rate of up to 60 g per hour, while limiting fiber to reduce gut distress; it also describes post-weigh-in carbohydrate targets of 8 to 12 g/kg for heavily depleted glycogen stores or about 4 to 7 g/kg after modest carbohydrate restriction. ISSN position stand
Those targets are not a reason to drink or eat beyond your needs or exceed your competition weight allowance.
If you have not deliberately depleted yourself, you may not need an aggressive recovery protocol.
A normal meal and appropriate fluids may be a more comfortable approach.
Choose foods you know you tolerate
After the scale, focus on familiar foods that sit well in your stomach.
Practical choices include:
- Rice with chicken or tofu
- A bagel with a familiar protein source
- Potatoes with eggs
- Yogurt with fruit
- A simple sandwich
- Easily digested carbohydrate-rich snacks
Avoid experimenting with unfamiliar foods just before competing.
A very large meal may leave you uncomfortable. A huge amount of water may also make you feel bloated.
Safety: Drinking more than your sweat and urine losses is the main cause of exercise-associated hyponatremia, involving blood sodium below 135 mmol/L; possible symptoms include bloating, nausea, vomiting, headache, confusion and seizures, and the condition can be fatal without treatment. Joint sports nutrition position
Do not force fluids simply because you have finished weighing in. Seek urgent medical care for serious symptoms.
Use the rehydration calculator to help organize a recovery plan, but remember that your random weigh-in allowance still matters.
For more food ideas, read what fighters eat after weigh-ins.
How do you choose the right judo weight category?
Your best category is not automatically the lightest one you could possibly reach.
It should be a category you can make without extreme restriction and still compete effectively.
Ask yourself:
- Am I already close to this category during normal training?
- Can I eat enough to support my practices?
- Do I recover well between training sessions?
- Am I trying to lose weight because it fits my body, or because I feel pressured?
- Can I make this category without dangerous last-minute methods?
- Will I still feel prepared to compete after the weigh-in?
If the answers raise concerns, consider competing in a higher category.
A category that lets you train consistently may be a better competitive choice than one that requires you to arrive exhausted.
For younger athletes, growth and development deserve special attention. Do not assume a weight category that worked before will always remain appropriate.
Review the judo weight classes before choosing your division.
Then discuss your choice with your coach and, when weight loss is involved, a qualified sports dietitian.
What should you do before your next judo weigh-in?
Start by checking your current body weight against your intended category.
The weight cut calculator can show the difference between your current weight and category limit. Treat the result as a planning figure, not a target you must force yourself to reach.
Then build a practical preparation routine:
- Confirm the weigh-in schedule and competition rules.
- Choose a category that suits your body and training.
- Plan regular meals and appropriate hydration.
- Avoid rapid dehydration and last-minute shortcuts.
- Know the applicable random weigh-in limit.
- Arrange familiar food and drinks for recovery.
- Ask for professional guidance if your weight goal raises health concerns.
CutCoach can build a day by day plan for calories, water, meals and refueling after the scale from your weight, weight class and weigh-in date.
Use any plan alongside the rules for your event and advice from qualified professionals.
The goal is not to become as light as possible. It is to make a sensible category, recover appropriately and arrive on the mat ready to do judo.