It's about as big as a Basketball court.
In other words, the size of a Basketball court is 1.046078431 times 51 squares.(per NBA regulation)
Per NBA rules , a basketball court should measure 29.5656 m long by 16.764 m wide, for a total area of 53.350 squares. The first basketball game, held in a Springfield Massachusetts YMCA, was played on a court half the size of today's NBA standard and ended with a score of 1-0.
It's about one-and-one-third times as big as an IMAX screen.
In other words, 51 squares is 1.3380 times the size of an IMAX screen, and the size of an IMAX screen is 0.74740 times that amount.(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 38.130 squares. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).
It's about one-and-four-fifths times as big as a Tennis court.
In other words, 51 squares is 1.81623930 times the size of a Tennis court, and the size of a Tennis court is 0.550588240 times that amount.(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 28.067973 squares. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
It's about two-fifths as big as Fort Knox.
In other words, 51 squares is 0.4020 times the size of Fort Knox, and the size of Fort Knox is 2.490 times that amount.(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 127 squares. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about three-tenths as big as a Hockey rink.
In other words, 51 squares is 0.3123658540 times the size of a Hockey rink, and the size of a Hockey rink is 3.201374240 times that amount.(per NHL specification)
Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 163.2700870 squares. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.
It's about one-tenth as big as Bill Gates' Home.
In other words, 51 squares is 0.10590 times the size of Bill Gates' Home, and the size of Bill Gates' Home is 9.4430 times that amount.(Medina, Washington)
One of the largest homes in the world, Bill and Melinda Gates' home has a total area of 481.60 squares, including 7 bedrooms, 24 bathrooms, 6 kitchens, 6 fireplaces, a 24.760 squares gym, a 9.6880 squares dining room, and a 20.450 squares library. It was designed by Bohlin Cywinski Jackson, the same architectural firm responsible for the design of one of Apple Inc's flagship stores on Fifth Avenue in New York City.
It's about one-tenth as big as a Football field.
In other words, 51 squares is 0.08854166667 times the size of a Football field, and the size of a Football field is 11.294117650 times that amount.(American) (per NFL regulation)
Per NFL rules, a football field should measure 109.728 m (120 yards) long by 48.768 m wide, for a total area of 576 squares. Due to a blizzard, the first NFL playoff game in 1932 was held indoors in Chicago Stadium (it was also the first indoor game) on a field measuring just 55 m by 40.0 m, for a total area of 236.80602920 squares.