How Do I Choose the Right Gi Size?

The Short Answer

Gi sizing is based on height and weight. Measure yourself, consult the specific brand's size chart (they all differ), and account for shrinkage if the gi isn't pre-shrunk.

Understanding Gi Sizes

The Letter System

Most gi brands use a letter/number system:

• A0, A1, A2, A3, A4, A5 (Adults)
• F1, F2, F3 (Women's cut)
• M0, M1, M2, M3, M4 (Kids)

What the Numbers Mean (Generally)

| Size | Height | Weight | |------|--------|--------| | A0 | 5'0" - 5'4" | 120-140 lbs | | A1 | 5'4" - 5'7" | 140-160 lbs | | A2 | 5'7" - 5'10" | 160-180 lbs | | A3 | 5'10" - 6'1" | 180-210 lbs | | A4 | 6'1" - 6'4" | 210-250 lbs | | A5 | 6'4"+ | 250+ lbs |

Warning: This varies significantly by brand. Always check the specific brand's chart.

The "L" and "H" Modifiers

Some brands offer:

• L (Long) - Same weight range but taller (A2L for tall/lean people)
• H (Husky) - Same height range but heavier (A2H for shorter/stockier people)

How to Measure Yourself

What You Need

• Height (without shoes)
• Weight
• Arm length (shoulder to wrist)
• Chest circumference
• Waist

Where to Measure

1. Height - Stand against a wall, measure floor to top of head
2. Weight - Use a scale, weigh at consistent time of day
3. Arm length - Shoulder to wrist, arm extended
4. Chest - Around fullest part of chest, under arms
5. Waist - Around natural waist (belly button level)

Brand-Specific Sizing

Every brand fits differently. A size A2 in Shoyoroll fits very differently than A2 in Fuji.

Research the Brand

• Read reviews
• Check forums/Reddit
• Ask training partners who own that brand

Consult Multiple Sources

Don't just look at the size chart. Search "[brand] [size] review" to see real fit experiences.

Pre-Shrunk vs. Non-Pre-Shrunk

Pre-Shrunk

• Buy your measured size
• Minimal shrinkage expected
• Usually clearly labeled

Non-Pre-Shrunk (Most Common)

• Size up by one size
• Shrink it with hot washes
• More room for customization

The Shrinking Process

• Wash in hot water
• Dry on high heat
• Check fit, repeat if needed
• Stop when you hit desired fit

What "Perfect Fit" Looks Like

IBJJF Standards

For competition, gis must meet specific requirements:

• Sleeves: No more than 5cm above wrist bone when arms extended
• Pants: No more than 5cm above ankle bone when standing
• Jacket width: Must be able to wrap 10cm across from each lapel

Training Comfort

• Sleeves end at wrist (can be slightly above)
• Pants end above ankles
• Jacket isn't baggy but allows movement
• Can breathe and move comfortably

Common Fit Problems

Too Big

• Excessive material to grab
• Gets in the way when moving
• Looks sloppy

Too Small

• Restricts movement
• Uncomfortable rolling
• May be illegal for competition

Weird Proportions

• Some gis fit torso but not arms (or vice versa)
• Consider different brands if this happens consistently

Tips for Online Buying

Keep Tags On Initially

Don't remove tags until you're sure of the fit.

Check Return Policies

Make sure you can return/exchange if sizing is off.

Order from Reputable Sellers

Fake gis exist. Buy direct from brands or authorized retailers.

When in Doubt, Size Up

You can shrink a gi. You can't stretch one.

What If You're Between Sizes?

Lighter Than Size Suggests

Go with the smaller size - you can always shrink it less.

Heavier Than Size Suggests

Go with the larger size - you can shrink it down if needed.

Unusual Body Type

Look for brands with L/H modifiers or women's/athletic cuts that might fit better.

The Best Approach

1. Measure yourself accurately
2. Check the specific brand's size chart
3. Search for reviews of that brand/size combo
4. Order (size up if not pre-shrunk)
5. Try it on before removing tags
6. Shrink to fit if needed
7. If totally wrong, exchange

Remember: Your first gi probably won't fit perfectly, and that's okay. You'll learn your preferences over time.