at http://www.hud.gov/offices/reac/pdf/pass_dict2.3.pdf (325 Pages, 343 KB) Additional clarification to these definitions is contained in the REAC PASS Compilation Bulletin which can be found at http://www.hud.gov/offices/reac/pdf/pass_bulletin.pdf (24 Pages, 275 KB)
An official NFL football is slightly larger than high school or other professional leagues. The length should measure about 11 inches from tip to tip, and the in circumference at the center of the football should measure about 22 inches.imilar to other levels of football, the NFL uses an egg-shaped football, but the NFL has specific rules to the size, shape and materials used for the football. The Digest of Rules of the NFL explains the official size requirements for the football, along with other basic rules for playing the game.
So the burning question is, what is the correct size of a football pitch and how does it vary? Well as shown by the hand drawn diagram (see top right), the actual football pitch length can vary enormously from 100 yards (91.44m) to 130 yards (118.9m). Furthermore the width of a football pitch can vary by 100% from just 50 (45.7m) to 100 yards (91.44m). So if you think that Tottenham's pitch at White Hart Lane appears to be small and must need a trip to Specsavers, in actual fact your eyes are propbably fine.