BJJ Gi Size Calculator
Finding the right BJJ Gi size is one of the most important steps when purchasing a new gi. A properly fitted Gi improves comfort, movement and confidence on the mats, while an incorrectly sized Gi can make training frustrating or even cause issues in competition.
Use this guide to find your ideal BJJ Gi size and understand the factors that affect fit.
Why Gi Sizing Matters
Brazilian Jiu Jitsu gis are designed to withstand intense training, gripping and sparring. A Gi that is too large can feel bulky and restrictive, while a Gi that is too small may limit movement and become uncomfortable during training.
A correctly sized Gi should:
✅ Allow full range of motion
✅ Fit comfortably around the shoulders
✅ Have sleeves and trousers within competition requirements
✅ Remain comfortable after washing
✅ Provide enough room for movement without excessive material
What Information Do You Need?
To determine the best Gi size, you will typically need:
Height
Your height helps determine the overall length of the jacket sleeves and trousers.
Weight
Your weight influences how the Gi fits around the body.
Body Type
Two people of the same height may require different sizes depending on build.
For example:
- Slim build
- Athletic build
- Broad shoulders
- Stocky build
Adult Men's BJJ Gi Sizes
Always check the manufacturer's sizing guide, as sizing may vary between brands.
Women's BJJ Gi Sizes
Women's gis typically use:
Women's cuts are designed to provide a more tailored fit while allowing unrestricted movement during training.
Kids BJJ Gi Sizes
Children's gis are usually sized according to age, height and weight.
Typical sizes include:
For younger children, it is often beneficial to allow a small amount of room for growth whilst maintaining a safe and comfortable fit.
Gi Shrinkage Considerations
Most BJJ gis experience some shrinkage after the first few washes, especially cotton-based products.
To minimise shrinkage:
- Wash at low temperatures
- Air dry whenever possible
- Follow the manufacturer's care instructions
- Avoid high-heat tumble drying
Read our guide: How Often Should You Wash a BJJ Gi?
Competition Fit
If you intend to compete, ensure your gi meets competition requirements.
Important considerations include:
- Sleeve length
- Trouser length
- Overall fit
- Approved colours
Read: IBJJF Legal Gi Colours Explained
Common Sizing Mistakes
Choosing Based On Clothing Size Alone
BJJ Gi sizing is different to standard clothing sizing.
Ignoring Weight Recommendations
Height alone rarely gives the best fit.
Forgetting Shrinkage
A perfectly fitted Gi may become too small after improper washing.
Buying Too Large
Excess material can make movement uncomfortable during training.
Final Thoughts
The best BJJ Gi size is one that balances comfort, mobility and durability. Taking a few minutes to check your measurements before buying can save time, money and frustration later.
Whether you're buying your first Gi or replacing an existing one, choosing the right size helps you train with confidence and get the most from every session on the mats.