What Size BJJ Gi Should I Get? (Complete Guide)
Choosing the right BJJ gi size is one of the most important decisions you’ll make when starting Jiu-Jitsu. A gi that fits properly will improve your comfort, performance, and confidence on the mats — while a poor fit can hold you back.
In this guide, we’ll break down how to choose the right size gi, what to look for, and how to get the perfect fit.
Understanding BJJ Gi Sizes
BJJ gis are typically sized using a letter and number system:
- A0–A5 = Adult sizes
- F1–F4 = Women’s sizes
- J0–J8 = Kids sizes
Each size is based on a combination of height and weight, not just one or the other.
General BJJ Gi Size Chart
While sizing can vary slightly between brands, here’s a general guide:
- A0: 160–170cm / 55–70kg
- A1: 165–175cm / 65–80kg
- A2: 170–185cm / 75–95kg
- A3: 180–195cm / 90–110kg
- A4+: Larger builds
👉 If you’re between sizes, your body type and preference will matter most.
How Should a BJJ Gi Fit?
A properly fitting gi should:
- Sit comfortably on your shoulders without restricting movement
- Have sleeves ending near your wrist (not too short or long)
- Pants should sit at the ankle
- Not be overly baggy or too tight
👉 For competition (IBJJF), there are strict rules on sleeve and pant length.
Choosing Based on Your Body Type
This is where most people get it wrong.
Lean / Athletic Build
- You may prefer a more fitted gi
- Consider sizing down if you’re on the lower end of a bracket
Stocky / Muscular Build
- You may need a slightly larger size for comfort
- Especially through shoulders and thighs
Between Sizes
- Want a tighter fit? → Size down
- Want comfort or room to shrink? → Size up
Gi Shrinkage (Important)
Most gis are made from cotton and can shrink slightly after washing.
To minimise shrinkage:
- Wash cold
- Avoid high heat drying
👉 If you’re right on the edge of a size, this is important to consider.
Lightweight vs Heavyweight Fit
The type of gi also affects how it fits:
- Lightweight gis: More tailored, slightly slimmer feel
- Heavyweight gis: Thicker, more structured fit
👉 This can influence whether you size up or down.
Whats bjj gi size should i get? The Easiest Way to Get the Right Size
Sizing charts are helpful — but the most accurate way is to use a size calculator.
On the main Hyperfly store:
👉 www.hyperfly.com
Our gi product pages include a built-in size calculator where you can enter your height and weight to get a personalised size recommendation.
This removes the guesswork and helps you choose with confidence.
Common Sizing Mistakes to Avoid
- Choosing based on height only
- Ignoring weight ranges
- Not accounting for shrinkage
- Picking a size too baggy “just in case”
👉 A well-fitted gi will always perform better than an oversized one.
Final Thoughts
Getting the right BJJ gi size doesn’t have to be complicated. By understanding your body type, how gis fit, and using tools like the Hyperfly size calculator, you can find the perfect fit for your training and competition needs.
A good fit means better movement, more comfort, and more confidence — exactly what you want every time you step on the mats.
Find Your Size and Get Started
Once you’ve worked out your ideal size, the next step is choosing the right gi for your training.
👉 Browse our full range of BJJ gis here
