EZ-Tennis.com it’s easy as
1 2 3
 
Tennis Court Diagram   Do you know the court?

The tennis court is 27 feet wide by 78 feet long (both sides included), for singles play, that is, one player playing against one other player.

The heavy lines in the diagram show the boundaries of the singles court. The doubles court is used when two players play against two other players. It includes the singles court and it is the same length but 4 1/2 feet wider on each side (dotted lines in the diagram).

The net is 3 feet high in the center and 3 1/2 feet high at the net post.

Do you know your racquet?