Dimensions of a Tennis Court

Tennis is played on a 60 by 120 foot surface in a 36 by 78 foot court that is divided into 10 playing zones. There are two each of baseline boxes, server boxes and doubles alleys. The main court is divided into two sides that cut the playing area into roughly equal squares. Play unfolds across the length of the court. The peripheral edge of the surface allows overshot balls to reach and extend inward to the formal lines of the tennis court boundary. Thus, the first line that marks the full tennis court playing surface is located 12 feet inside the edge of the narrow side, and 21 feet inside the edge of the wide side.

Back court and alley dimensions

The baselines are located at the furthest ends of a tennis court to designate the back court used for serving the ball into play. The baselines define whether a ball's bounce is considered in or out of play. The back court dimensions, which include two outer alleys for doubles play, are 21 by 36 feet wide. This space also sandwiches the back court, 21 by 27 feet wide, for singles play.

Service court dimensions

The service courts in the middle of the playing area are equally divided between the opposing sides of the center net. They are further divided into two equal rectangles comprising the advantage and deuce courts, adjacent to the net. The two courts are 13.5 by 21 feet for a singles playing area of 27 by 21, and 13.5 by 18 feet for doubles playing area of 27 by 36 feet.

Regulation tennis court dimension are the same world-wide. Informal courts may vary dimensions by a foot or so, but maintain the same layout of playing zones within the court.