Jiu Jitsu Gi Size Guide: How to Find Your Perfect Fit

Finding the right jiu jitsu gi size is one of the most important decisions you’ll make as a Brazilian Jiu Jitsu practitioner. Whether you’re stepping onto the mats for the first time or you’re a seasoned competitor, wearing a properly fitted gi can significantly impact your performance, comfort, and overall training experience. A gi that’s too large can give your opponents easy grips and fail competition regulations, while one that’s too small will restrict your movement and wear out prematurely.

This comprehensive guide will walk you through everything you need to know about selecting the perfect jiu jitsu gi size, from understanding sizing charts to accounting for shrinkage and individual body types.

Understanding Gi Sizing Systems

Unlike regular clothing, jiu jitsu gis use a unique sizing system that can initially seem confusing. Most manufacturers use a combination of letter sizes (A0, A1, A2, A3, A4, A5) and sometimes additional variants to accommodate different body types.

The Standard Sizing Scale

The “A” sizes are the most common and are designed for athletes with proportional height-to-weight ratios. Here’s a general breakdown:

• A0: Typically fits 4’11” – 5’4″ and 95-125 lbs
• A1: Typically fits 5’4″ – 5’8″ and 125-155 lbs
• A2: Typically fits 5’8″ – 6’0″ and 155-185 lbs
• A3: Typically fits 6’0″ – 6’3″ and 185-215 lbs
• A4: Typically fits 6’2″ – 6’5″ and 215-245 lbs
• A5: Typically fits 6’4″+ and 245+ lbs

Additional Size Variants

Many brands also offer alternative size ranges to better accommodate different body proportions:

• H sizes (H1, H2, H3): Designed for shorter, stockier builds with more weight relative to height
• L sizes (L1, L2, L3): Created for taller, leaner athletes with more height relative to weight
• F sizes (F1, F2, F3): Specifically cut for female practitioners with considerations for different body proportions

How to Measure Yourself for a Jiu Jitsu Gi

Getting accurate measurements is crucial for determining your correct jiu jitsu gi size. You’ll need a flexible measuring tape and preferably someone to help you for the most precise results.

Key Measurements to Take

Height: Stand straight against a wall without shoes. Measure from the floor to the top of your head.

Weight: Weigh yourself at your typical training weight, not at extreme fluctuations.

Sleeve Length: Extend your arm straight out to your side. Measure from the center of your back (at the base of your neck) across your shoulder to your wrist bone.

Inseam: Measure from your crotch to your ankle bone. This helps determine if you need a longer or shorter cut.

Shoulder Width: Measure across your back from shoulder seam to shoulder seam on a well-fitting shirt.

Accounting for Gi Shrinkage

One of the most critical factors when selecting your jiu jitsu gi size is anticipating shrinkage. Most gis are made from cotton, which naturally shrinks when washed, especially when exposed to heat.

Pre-Shrunk vs. Unshrunk Gis

Some manufacturers offer pre-shrunk gis that have minimal shrinkage after washing, while others are sold unshrunk. Always check the product description to understand what to expect.

Unshrunk gis: Can shrink 2-6 inches in length and 1-3 inches in width after the first few washes. Many experienced practitioners intentionally buy one size larger to account for this.

Pre-shrunk gis: Will still experience some shrinkage (typically 1-2 inches) but much less dramatically. These are easier to size correctly from the start.

Washing Tips to Control Shrinkage

• Always wash your gi in cold water to minimize shrinkage
• Hang dry whenever possible instead of using a dryer
• If you need to shrink a gi, use warm water and a dryer on low heat gradually
• Never use hot water or high heat unless you intentionally want maximum shrinkage

IBJJF Size Regulations

If you plan to compete in tournaments sanctioned by the International Brazilian Jiu-Jitsu Federation (IBJJF), your gi must meet specific size requirements. Understanding these regulations is essential when selecting your jiu jitsu gi size for competition.

Official IBJJF Requirements

Jacket: The sleeves must reach no more than 5 cm (2 inches) above the wrist bone when arms are extended. The jacket must be long enough to cover the thighs and reach at least below the fists when arms hang at your sides.

Pants: Pant legs must reach no more than 5 cm above the ankle bone. The pants should not extend past the ankle.

Sleeve Width: There must be 7 cm (2.75 inches) of space between your forearm and the sleeve fabric.

Lapel Thickness: The lapel should be 1.3 cm thick and no more than 5 cm wide.

These regulations ensure fair competition and prevent practitioners from gaining unfair advantages through ill-fitting gis.

Different Body Types and Size Selection

Your individual body proportions play a significant role in determining the right jiu jitsu gi size beyond just height and weight.

Shorter and Stockier Build

If you carry more weight relative to your height, standard “A” sizes might have sleeves and pant legs that are too long. Consider “H” sizes or look for brands that offer husky fits. You may also need to have sleeves and pants hemmed for optimal fit.

Taller and Leaner Build

Athletes with longer limbs and less bulk should look at “L” sizes or tall variants. Standard sizes might fit around the torso but leave sleeves and pants too short, which could violate competition regulations or simply feel uncomfortable.

Athletic and Muscular Build

If you have broad shoulders, a thick chest, or muscular legs, you might need to size up to accommodate these areas, even if it means having slightly longer sleeves or pant legs that can be hemmed.

Brand-Specific Sizing Considerations

It’s important to note that gi sizing can vary between manufacturers. A size A2 from one brand might fit differently than an A2 from another brand.

Always consult the specific brand’s sizing chart before purchasing. Read customer reviews to see if a particular brand runs small, large, long, or short. At Stylso, we provide detailed sizing charts for each gi model and our customer service team is available to help you find your perfect fit based on your measurements and preferences.

When to Size Up or Down

Size up if:

• You’re between sizes and the gi is unshrunk
• You have broader shoulders or a more muscular build
• You prefer a slightly looser fit
• You’re still growing (common for youth practitioners)

Size down if:

• The gi is pre-shrunk and you’re between sizes
• You prefer a tighter, more competition-oriented fit
• You have a leaner build within your height range
• Customer reviews indicate the brand runs large

Testing Your Gi Fit

Once you receive your gi, test the fit before washing to see if you need to exchange sizes. Put on the gi and perform these checks:

• Extend your arms forward – sleeves should reach your wrist bone or slightly beyond (accounting for shrinkage)
• Stand naturally – the jacket should cover your thighs and reach below your fists
• Check pants length – they should reach your ankle bone or slightly below before washing
• Perform basic movements – shrimping, arm drags, and guard work to ensure mobility
• Close the jacket – it should overlap enough to stay closed during training

Remember that an unwashed gi will feel larger than after it’s been washed several times. Factor in expected shrinkage when evaluating the initial fit.

Frequently Asked Questions

Should I buy a bigger gi if I’m planning to lose or gain weight?

It’s best to buy a gi that fits your current body size. Significant weight changes (more than 10-15 pounds) will affect how your gi fits, and you may need a different size eventually. Focus on your current training weight when selecting your jiu jitsu gi size, and consider purchasing a new gi if your body composition changes substantially.

How much will my gi shrink after washing?

Shrinkage varies by fabric and washing method. Unshrunk gis typically shrink 2-6 inches in length and 1-3 inches in width with hot water and dryer use. Pre-shrunk gis shrink minimally (1-2 inches). To minimize shrinkage, always wash in cold water and hang dry. If you need to shrink your gi intentionally, gradually use warmer water and low heat drying.

Can I compete in a gi that doesn’t fit IBJJF standards?

No, if you’re competing in IBJJF-sanctioned tournaments, your gi must meet their specific size requirements or you risk disqualification before your matches even begin. Referees check gi compliance before allowing competitors on the mat. Make sure your sleeves and pants fall within the required measurements and that there’s adequate space in the sleeves.

What if I’m between two sizes on the sizing chart?

If you’re between sizes, consider the gi’s shrinkage properties and your body type. For unshrunk gis, size up. For pre-shrunk gis, choose based on your build – size up if you’re more muscular or prefer looser fits, size down if you’re leaner or prefer tighter fits. You can also contact the manufacturer for personalized recommendations based on your specific measurements.