Free tool
Mat capacity calculator
Find out how many students can train safely on your mat for each type of class, or how much mat you need for a group, before you set class limits or sign a lease.
No sign-up. Your numbers stay in your browser.
Results
Technique & drilling
Sparring & rolling
Mat preview: each figure is one person at the comfortable spacing.
Results are planning estimates, not professional, financial or federation advice.
How to use it
- 01
Choose what to calculate
Start from your mat size to get capacity, or from a group size to get the mat area you need.
- 02
Enter your space
Use length × width or a total area, in square metres or square feet, and set a safety margin for walls, pillars and walkways.
- 03
Compare class types
Select the classes you run. Each shows a comfortable number and an absolute maximum.
Space per person by class type
- Technique and drilling: 4–6 m² per person. Pairs stay mostly in place.
- Live sparring and rolling: 8–10 m² per person. Pairs travel and need clear space between them.
- Mixed classes: 6–8 m² per person, for technique followed by positional or light sparring.
- Striking, pads and bags: 5–7 m² per person, including room to move around a partner.
- Kids classes: 3–4 m² per child, more for games that involve running.
Comfortable versus maximum capacity
The comfortable figure uses the generous end of each range and is the number to publish as your class limit. The maximum uses the tight end: possible for a seminar or a grading, but collisions and injuries become more likely in live rounds.
Common sizing mistakes
- Measuring the room instead of the matted area.
- Forgetting pillars, heavy bags and the strip by the door that people walk across.
- Using one ratio for every class. Sparring needs roughly twice the space of drilling.
- Setting class limits from the maximum instead of the comfortable figure.
Reference sizes
A traditional judo tatami is 1 m × 2 m (2 m²); jigsaw mats are usually 1 m × 1 m. An IJF competition area combines a contest area of 8–10 m square with a 3 m safety zone around it, which is why competition mats are much larger than most club floors.
Frequently asked questions
How many square metres does each student need?
About 4–6 m² for technique and drilling, 8–10 m² for live sparring or rolling, and 3–4 m² for young children. Use the higher number of each range for your published class limit.
How many people fit on a 100 m² mat?
With a 15% safety margin, 85 m² is usable: about 14–21 people drilling technique, or 8–10 sparring at the same time. Halving the group for rounds is common in busy classes.
What safety margin should I use?
Use 10–15% for an open, rectangular mat with padded walls, and 20% or more if there are pillars, bags, doors or awkward corners.
Should I limit class sizes?
Yes, for live training. Caps protect students and keep coaching quality high. Booking systems such as MatSync can stop sign-ups automatically when a class reaches its limit.
Run the academy, not the spreadsheet.
MatSync handles schedules, bookings, attendance, belt progress and payments in one place, with a member app for iOS and Android.