BJJ Gi Size Chart: A0 to A5 Fit Guide

Buying a gi can be confusing, especially if you're new to Brazilian Jiu-Jitsu. Your normal T-shirt or jeans size doesn't always tell you which gi will fit. That's because BJJ gis use their own sizing system, and the cut can vary between brands and models. An A2 gi from one brand, for example, may not fit exactly like an A2 from another.

This BJJ gi size chart will help you understand the common A0-A5 sizing system, compare height and weight ranges, and learn how to measure yourself before buying. Whether you're choosing your first gi or replacing an old one, getting the right size matters for comfort, movement, and training. We'll also cover shrinkage, jacket and pants fit, kids' sizing, and common mistakes so you can shop with more confidence.

How BJJ Gi Sizing Works

A BJJ gi size chart uses adult sizes from A0 to A5, generally based on a combination of height and weight. A0 fits smaller adult grapplers, while sizes increase through A1, A2, A3, A4, and A5. Always check the specific brand's size chart because gi cuts can vary.

Unlike regular clothing, BJJ gi sizing is designed around how the uniform fits during grappling. A gi needs enough room for movement, but it also can't be excessively loose. Your opponent can grip the jacket and pants, so a very oversized gi may affect both comfort and training.

The letter "A" generally stands for adult sizing. The number that follows represents the overall size range:

• A0: Smaller adult grapplers

• A1: Small to average-sized adults

• A2: One of the most common adult sizes

• A3: Larger or taller grapplers

• A4: Large adult grapplers

• A5: Extra-large adult grapplers

Some brands also offer in-between sizes such as A1L, A2L, A2H, or A3H. "L" usually refers to a longer cut for taller grapplers, while "H" may indicate a heavier or wider build. However, these labels aren't completely standardized, so you should always read the manufacturer's measurements.

General A0-A5 Gi Size Chart

The table below provides a general starting point. It isn't a replacement for the specific size chart provided with the gi you're considering.

These ranges can overlap, and that's normal. If you're between two sizes, your body shape and preferred fit become important. A taller, leaner person may need a long size, while someone with a broader build may need a wider cut.

When shopping for BJJ gis or Shoyoroll gis, use the product-specific sizing information whenever it's available. BJJ gis can have different cuts, fabric constructions, and fit characteristics, so the label alone shouldn't be your only deciding factor.

How to Measure Yourself for a Gi

If you're wondering how to measure for a BJJ gi, you don't need any complicated equipment. A flexible tape measure, your current height, and your body weight are usually enough to make a much better sizing decision.

Here is a simple step-by-step method.

1. Measure Your Height

Stand straight without shoes against a wall. Keep your feet flat on the floor and measure from the floor to the top of your head.

Write the measurement down in either feet and inches or centimeters. Most gi size charts include height ranges, so accurate height is one of the first things to check.

If you're right at the edge between two height ranges, don't automatically choose the larger gi. Compare your weight and body type as well.

2. Check Your Current Weight

Weigh yourself and compare your weight with the recommended range for each size.

Height and weight work together when choosing a gi. For example, someone who is 5'9" and 150 pounds may have different sizing needs from someone who is also 5'9" but weighs 205 pounds.

That's why choosing based only on height or only on weight can lead to a poor fit.

3. Measure Your Chest

Wrap the tape measure around the fullest part of your chest. Keep it level and avoid pulling it too tightly.

Chest measurements can be particularly useful if you have broad shoulders or a muscular upper body. A gi jacket that's too tight across the chest and shoulders can restrict movement when you're framing, reaching, or fighting for grips.

4. Measure Your Waist and Hips

Measure around your natural waist and, if possible, around the widest part of your hips.

The pants should allow you to squat, step, sit, and move comfortably. They shouldn't feel overly tight around the hips or thighs.

Remember that many BJJ gi pants use a drawstring or elastic waist system, so there may be some adjustment available. Still, the waist isn't the only thing that matters. Leg length and thigh room are equally important.

5. Measure Your Arm and Leg Length if You're Between Sizes

If you're unusually tall for your weight or have longer arms and legs, check the gi's sleeve and inseam measurements.

This is especially helpful when deciding between standard and long sizes. A standard A2 might fit your chest and waist perfectly but leave the sleeves too short. In that case, an A2L or another longer option may provide a better overall fit.

The best gi fit guide doesn't rely on one measurement. Look at the complete picture: height, weight, build, chest, waist, and limb length.

Gi vs No-Gi Training: Why Sizing Is Different

If you also do no-gi training, clothing sizes may feel more familiar because rash guards and shorts are generally chosen using standard garment measurements. No-gi training gear is designed differently from a traditional gi, which has a heavier jacket, reinforced pants, and specific sleeve and trouser lengths.

That means you shouldn't assume your no-gi rash guard size is automatically your BJJ gi size.

Common Sizing Mistakes

Choosing a gi based on a single number is one of the biggest mistakes beginners make. Here are several things to watch for before placing your order.

Ignoring Gi Shrinkage After Washing

Cotton gis can shrink, especially when exposed to hot water or high dryer heat. The amount of shrinkage depends on the fabric, weave, pre-shrinking process, and washing method.

Some gis are designed to be pre-shrunk, but that doesn't always mean they won't shrink at all. Before washing a new gi, check the care instructions.

If your gi already fits very tight before its first wash, even minor shrinkage could make it uncomfortable or affect its competition legality. Washing in cold water and air drying can often help reduce unnecessary shrinkage.

Don't buy an extremely oversized gi just because you're worried about shrinkage, though. Start with the manufacturer's recommended size and consider how the product is intended to be washed.

Choosing Based Only on Your Regular Clothing Size

An "L" T-shirt doesn't necessarily translate to an A3 gi. BJJ uniforms are cut for grappling, and their sizing follows a different system.

You might wear medium shirts but need an A1 or A2 depending on your height, weight, and build. This is why a BJJ gi size chart is much more useful than comparing the gi to your everyday clothes.

Forgetting About Jacket vs Pants Fit

A gi is made up of two major pieces, and your body proportions may not fit both in exactly the same way.

Some people have long legs but a shorter torso. Others have broad shoulders and relatively narrow hips. You may find that the jacket feels perfect while the pants are slightly long, or vice versa.

Check the full size specifications when available. If you're between sizes, consider which part of the gi is most likely to cause a problem.

Minor sleeve or pant length adjustments may sometimes be possible, depending on the construction and competition rules, but you shouldn't rely on alterations without checking your academy or tournament requirements.

Going Too Tight for a "Fitted" Look

A BJJ gi isn't supposed to fit like compression clothing. You need room to move through positions, escape, grip fight, and train for extended periods.

A jacket that's extremely tight around the shoulders can make movement uncomfortable. Pants that are too tight may restrict hip mobility.

At the same time, a gi shouldn't be so loose that the sleeves and pants hang excessively. Aim for a functional fit rather than simply the smallest or largest size you can wear.

Assuming Every A2 Fits the Same

This is another important point when comparing an A0 A1 A2 A3 gi size range across brands.

The A2 label gives you a general category, not a universal measurement. One brand may use a slimmer cut, while another offers more room through the shoulders or thighs.

Always compare the actual chart when buying from a new brand or switching between gi models.

Kids vs Adult Gi Sizing Differences

Kids' gis use a different sizing approach from adult A0-A5 sizes. Children's BJJ uniforms are usually sized by age ranges, height, or youth-specific labels rather than adult A-number categories.

That means an adult A0 isn't automatically the same as a large kids' gi. A growing child should be measured using the size chart for that specific product.

When checking kids gi sizing, consider the child's current height and weight first, then allow for reasonable growth without choosing something excessively oversized. Kids gi sizing options should still allow safe and comfortable movement, especially during drilling and grappling.

Parents should also consider sleeve and pant length. A gi that's slightly roomy may be manageable, but excessively long sleeves or pants can interfere with movement and may not meet academy or competition requirements.

For adults, the A0-A5 system is more common. If you're buying a new uniform for yourself, browse BJJ uniforms and compare each product's available sizes and measurements before ordering. BJJ uniforms

FAQ

Should a BJJ gi be tight or loose?

A BJJ gi should fit comfortably with enough room to move, but it shouldn't be excessively baggy. The jacket should allow natural shoulder and arm movement, while the pants should let you squat and move your hips freely. A very tight gi can restrict movement, while an overly loose one can feel uncomfortable and provide extra fabric for grips.

How do I know if I need A1 or A2?

Compare your height and weight with the brand's size chart first. If you're near the overlap between A1 and A2, consider your body type. Leaner grapplers may prefer the smaller or longer option, while broader or heavier athletes may need the larger size. Check sleeve, jacket, waist, and pant measurements when available.

Should I size up because my BJJ gi will shrink?

Not automatically. First check whether the gi is pre-shrunk and follow the manufacturer's care instructions. If you buy a gi that's already too large, it may remain oversized even after washing. If you're between sizes and expect some shrinkage, consider that factor, but don't ignore the product's official size recommendations.

What does A0 to A5 mean in BJJ gi sizing?

A0 through A5 are common adult BJJ gi sizes. A0 generally fits smaller adults, with each number increasing in overall size. The system considers both height and weight, although exact measurements vary by brand. Some manufacturers also offer long or heavier-build variations such as A2L or A2H.

Find the Right Gi for Your Training

The right size can make a big difference in how comfortable you feel on the mats. Use this BJJ gi size chart as a starting point, but always compare your measurements with the size information for the specific gi you want to buy.

Take a few minutes to measure your height, weight, chest, waist, and limb length if needed. Consider possible shrinkage, pay attention to both jacket and pants fit, and don't assume every A-size fits exactly the same.

Once you've found the size that matches your build, explore Cosmeio BJJ's collection of BJJ gis and Shoyoroll gis and choose a uniform that fits your training needs. Shop BJJ gis at Cosmeio BJJ