The exact dimensions of a boxing ring used for competition will vary depending upon the boxing organization that is sanctioning the fight however the following is a good general guide.

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Boxing Ring Dimensions

Boxing rings range from a minimum of 4.9 M x 4.9 M  ( 16x 16 ft )  to a maximum of 6.1 M x 6.1 M  ( 25 x 25 ft ) as measured inside the line of the ropes.

They are constructed as a raised platform of between 910 mm and 1220 mm above the ground level.

There must be a minimal 2000 mm clear zone around the outside of the ring.

The floor of the ring is comprised of a flat and level 20 – 25 mm thick plywood flooring over a robust steel frame, covered by 20 – 25 mm of foam and a final canvas cover – the floor must extend at least 460 mm outside the line of the ropes.

Flexible “ropes” are used to enclose the boxing ring area – the ropes must be between 30 and 50 mm in thickness, covered in a soft material sleeve and tightly suspended from the fours corner posts.  The are three rope configurations and four rope configurations.

Three rope configuarations are at 400 mm,  800 mm and 1300 mm.

Four rope configurations are at 406 mm, 711 mm , 1016 mm and 1320 mm

These ropes are secured to upright steel posts at each of the four corners, the steel posts must be fitted with padded covers as follows

Boxing rings must be lit at approximately 500 lux for training and 1000 lux for competitive boxing tournaments.

More detail including technical construction drawings are available here – How to Build a Boxing Ring