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TLDR: Small cage leads to 10-12% higher finish rates.

Update:
average in large cage is 48% finishes.
Tonight = 69% finishes.
What’s the UFC Octagon Size?
There are two UFC octagon sizes. The original and larger UFC octagon is 30 feet across (9.1m), and 5 feet 9 inches high (1.8m), with the inside fight space measuring 746 square feet.
The smaller UFC octagon is 25 feet (7.6m) in diameter, is the same height as the original, and has a total space of 518 square feet.


Those who were watching during the WEC days will probably remember that the smaller 25 foot cage lead to a lot of action.
Hopefully that means we get a night of beautiful glorious violence tonight.
May these fighters paint the Octagon red tonight and when they wake up from exhilerating knockouts may they all go home safely to their families with minimal long term damage.
Dude just got slept BAD in the Prelims, 17 seconds and dude STARCHED, and it was a flyweight fight. Good start.
Just bleed.
- Jeff

Here is an article that breaks down some statistics on finish rates depending on cage size and weight class, main card vs Prelims, etc..
https://www.actionnetwork.com/mma/t...and-using-the-octagon-size-to-handicap-fights
An older bloody elbow article :
TLDR:
Small cage resulted in 3% increase in upsets and 2.7% increase in clinch time.
https://bloodyelbow.com/2015/06/30/...ize-finishes-knockouts-submissions-decisions/
https://groundedmma.com/ufc-octagon-size/
How Does UFC Octagon Size Influence UFC Outcomes?
While a minority of people think UFC octagon size has no influence on the outcome of a fight, the majority of fighters and spectators believe it does.
This is supported by the alarming statistic showing the bigger octagon has a 48% finish rate, while the smaller-sized octagon has a 60% finish rate and 20% more strikes thrown.

Update:
average in large cage is 48% finishes.
Tonight = 69% finishes.
What’s the UFC Octagon Size?
There are two UFC octagon sizes. The original and larger UFC octagon is 30 feet across (9.1m), and 5 feet 9 inches high (1.8m), with the inside fight space measuring 746 square feet.
The smaller UFC octagon is 25 feet (7.6m) in diameter, is the same height as the original, and has a total space of 518 square feet.


Those who were watching during the WEC days will probably remember that the smaller 25 foot cage lead to a lot of action.
Hopefully that means we get a night of beautiful glorious violence tonight.
May these fighters paint the Octagon red tonight and when they wake up from exhilerating knockouts may they all go home safely to their families with minimal long term damage.
Dude just got slept BAD in the Prelims, 17 seconds and dude STARCHED, and it was a flyweight fight. Good start.
Just bleed.
- Jeff

Here is an article that breaks down some statistics on finish rates depending on cage size and weight class, main card vs Prelims, etc..
https://www.actionnetwork.com/mma/t...and-using-the-octagon-size-to-handicap-fights
An older bloody elbow article :
TLDR:
Small cage resulted in 3% increase in upsets and 2.7% increase in clinch time.
https://bloodyelbow.com/2015/06/30/...ize-finishes-knockouts-submissions-decisions/
https://groundedmma.com/ufc-octagon-size/
How Does UFC Octagon Size Influence UFC Outcomes?
While a minority of people think UFC octagon size has no influence on the outcome of a fight, the majority of fighters and spectators believe it does.
This is supported by the alarming statistic showing the bigger octagon has a 48% finish rate, while the smaller-sized octagon has a 60% finish rate and 20% more strikes thrown.
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