MMA cage or boxing ring? What your martial arts gym really needs

The question behind the question: what do your members train?

Choosing between a cage and a ring is not a matter of taste. It follows from what your gym offers. A ring is built for disciplines fought on the feet. A cage is built for disciplines that also involve work on the ground and against the enclosure.

Demand for combat sports is growing. According to the 2025 membership survey of the German Olympic Sports Confederation (DOSB), boxing had exactly 88,388 club memberships on 1 January 2025, up 8.87 % on the previous year. Kickboxing reached 37,200 memberships, up 12.15 %. The survey does not list a separate figure for MMA, which makes it all the more important to know your own target group.

• Which classes do you offer today, and which do you want to offer in two years?
• Do your members mainly train standing, or on the ground as well?
• Will bouts take place in the gym, and if so, under which rules?
• How much floor space and ceiling height do you really have?

The boxing ring: dimensions and use

A boxing ring is square and enclosed by three or four ropes. Under the competition rules of the German Boxing Federation (DBV), each side of the roped square measures between 4.90 and 6.10 metres. The floor padding of the fighting area is 1.5 to 2 cm thick. In a raised ring, the platform is no more than 1.25 metres above the hall floor.

The ropes give. Athletes can lean on them, work their way out of a corner and use them for orientation. They are not suited to groundwork: anyone on the floor can slide under the ropes. The ring is therefore the choice for boxing and for kickboxing and Muay Thai formats fought in a ring.

The MMA cage: rules and octagon size

In Germany, there is no rulebook for the cage equivalent to the DBV's rules for the ring. International requirements provide guidance. The amateur rules of the International Mixed Martial Arts Federation (IMMAF) require a circular fighting area or a shape with equal sides, such as a hexagon or octagon. It must measure at least 20 × 20 feet and no more than 32 × 32 feet, roughly 6.10 to 9.75 metres.

Further IMMAF requirements: the floor is padded with at least 40 mm of high-density foam and covered with vinyl. The fence must stop an athlete from falling out or breaking through, for example vinyl-coated chain-link fencing. Metal parts are padded. The cage has two gates that open outwards, preferably on opposite sides.

State rules in the USA point in the same direction. The regulations of the State of Pennsylvania require the fenced area to be circular or to have at least six equal sides, and to be at least 20 feet wide. The platform may be no more than 4 feet, about 1.22 metres, above the floor of the building.

How big is an octagon?

The best-known cage is the UFC Octagon. According to the UFC, the fighting area measures 30 feet (9.1 m) across. Including the surrounding walkway, the exterior diameter is 38 feet (11.5 m). The fence is 5 feet 9 inches high, about 1.8 m, and the platform stands 4 feet (1.2 m) above the floor. For smaller venues, there is a version 25 feet (7.6 m) across. For a gym, these sizes are reference points, not requirements. What matters more is what fits your room and how many pairs need to train at the same time.

MMA cage and boxing ring compared

The table shows the key difference: a cage needs more floor space and considerably thicker flooring. In return, it offers a closed enclosure that athletes can train against. A ring is more compact but does not allow safe groundwork.

Which discipline belongs where?

• Boxing: ring. The rules are designed around the ring, and bouts take place in it.
• Kickboxing and Muay Thai: a ring for full-contact formats fought in a ring, a mat area for formats held on the mat.
• MMA: cage. Clinching against the fence, takedowns and groundwork are part of the sport.
• Grappling and BJJ: a mat area is usually enough. A cage helps if athletes also train against the enclosure.
• Fitness and technique classes: no ring or cage needed, but a well-padded area is.

Many gyms offer several disciplines. In that case, plan around the timetable. Which classes fill the evening slots? Which classes really need an enclosure, and which work with open mat space?

Planning space, height and flooring

A cage at the 20-foot minimum width takes up a good 6 × 6 metres before any surrounding space. The UFC Octagon, walkway included, is 11.5 metres across. Add walkways, access to both gates and clearance from the walls. A boxing ring to DBV rules needs at most 7.80 × 7.80 metres including the platform, again plus surrounding space.

Height depends on the type of construction. A cage or ring on a platform needs more ceiling height than a ground-level solution. Add together the platform height, fence or rope height, athlete height and clearance for lighting. In low rooms, a ground-level version is often the better choice.

• Load capacity: platforms and cages transfer loads into the floor at specific points. Check with your landlord or a structural engineer.
• Flooring: under IMMAF rules, a cage needs at least 40 mm of padding. This affects the transitions to adjacent areas.
• Access: fence panels, posts and platform parts must fit through doors and stairwells.
• Sight lines: coaches should be able to see the cage or ring from the training floor.
• Wall areas: padded walls complement a cage or ring and protect tight spots.

Care in day-to-day training

Cages and rings are used every day, so plan their care from the outset. A vinyl cover, as IMMAF specifies for the cage floor, can be wiped clean with a damp cloth. With groundwork and a lot of skin contact, that matters. Check the padding on posts and fence, the gate latches, rope tension and bolted connections regularly. Replace damaged padding straight away, not at the next scheduled service.

Decision guide: cage, ring or both

One simple rule helps: your gym's main discipline determines your main fighting area. Everything else complements it.

• Ring first if boxing, kickboxing or Muay Thai carry the timetable and bouts under federation rules are planned.
• Cage first if MMA is the focus and athletes train against the fence and on the ground.
• Both if your floor space and membership can support two permanent fighting areas. Then it pays to plan them together from the start.
• Mats plus padded walls if space is tight and competition is not a priority.

Leave room to grow. If you offer only boxing today and want to add MMA in two years, divide the space so that a cage can fit later.

Think about events, too. A cage or ring on a platform has more impact at events than a ground-level solution, but needs more height and more room for spectators. If you only plan occasional fight nights, a ground-level solution may be the better choice for everyday use.

How Cachena Sport helps

Cachena Sport builds MMA cages, boxing rings and wall padding to measure in its own workshop near Ulm, made in Germany, and installs them on site. Founder Amer Osmanhodzic is a two-time European kickboxing champion and has worked in metal fabrication for more than 15 years. Across more than 500 projects, we have seen how different rooms and requirements can be.

1. Initial conversation
2. Consultation and situation analysis
3. Defining the facility
4. Production in our own workshop
5. Delivery and installation
6. Handover and maintenance

Branding on canvases, ropes, corner pads, punchbags and wall padding is possible. We give a 10-year warranty on the steel structures we manufacture ourselves; wear parts such as pads, ropes, mats, floors and coatings are excluded. We deliver across Europe.

The current rules of the relevant federations and promoters always take precedence. The information reflects the status as of September 2026. If bouts are to take place, check the requirements with the responsible federation before you buy.