American football has a playing field of 57,600 square feet, with 9,600 of those covering the two end zones. NHL hockey is played on a rink with 17,000 square feet. The regulation NBA basketball court covers 4,700 square feet.
The average playing field in major league baseball covers 2.49 acres, or 108,464 square feet. Target Field is a touch smaller at 107,593 square feet. Fenway Park in Boston, opened in 1912, has the smallest playing field at 99,000 square feet.
There are 34,000 square feet in the grass and dirt areas of a baseball infield, and another 77 square feet for the two batter's and the catcher's boxes.