It's about 10,000 times as big as Trafalgar Square
In other words, 30,000 acres is 10,000 times the size of Trafalgar Square, and the size of Trafalgar Square is 0.000 times that amount.(a.k.a. Charing Cross) (City of Westminster, London, England, United Kingdom)
Trafalgar Square, a public square in London, measures about 3 acres. m in total area. At the center of the Square is the 52 m Nelson's Column monument, built in the 1840s.
It's about 10,000 times as big as a City Block (Manhattan)
In other words, 30,000 acres is 10,000 times the size of a City Block (Manhattan), and the size of a City Block (Manhattan) is 0.000 times that amount.(per Bridges, William - 1811 Commissioner's Plan for New York City) (approximate)
A Manhattan city block measures about 200 m between the Northeast-Southwest streets by about 60 m between the Northwest-Southeast streets for a total area of about 2 acres. There are roughly 2,000 blocks within the city, representing one of the most prolific applications of the city planning grid plan in history.
It's about one-fifteen-thousandth as big as Alaska
In other words, 30,000 acres is 0.000070672869 times the size of Alaska, and the size of Alaska is 14,149.701 times that amount.(United States)
The "Last Frontier," Alaska measures 424,491,040 acres in total area. Alaska is home to over 100,000 glaciers — half of the world's total — including the Bering Glacier complex near the southeastern border of Alaska, which covers 1,440,624.40 acres.
It's about 15,000 times as big as The Palace of Holyroodhouse
In other words, 30,000 acres is 15,000 times the size of The Palace of Holyroodhouse, and the size of The Palace of Holyroodhouse is 0.000067 times that amount.(a.k.a. Holyrood Palace) (Royal Mile, Old Town, Edinburgh, Scotland, United Kingdom) (Palace without gardens)
The Palace of Holyroodhouse, the residence of the British Monarch in Scotland, measures about 2 acres, on a total grounds area of about 9.90 acres. Each year, the Palace hosts a Garden Party, serving 8,000 guests from a 150-meter-long buffet table.
It's about 15,000 times as big as Seal Island
In other words, 30,000 acres is 15,000 times the size of Seal Island, and the size of Seal Island is 0.000067 times that amount.(Western Cape province, South Africa)
Seal Island, named for the tens of thousands of Cape Fur Seals that live there, measures about 2 acres. The large number seals attract great white sharks, who circle the island in a so-called "Ring of Death."
It's about 20,000 times as big as The White House
In other words, 30,000 acres is 20,000 times the size of The White House, and the size of The White House is 0.000050 times that amount.(Washington, DC) (including wings)
Housing the presidency, the White House occupies six stories and a total of 1.50 acres of floor space. This space includes 132 rooms, 35 bathrooms, 28 fireplaces, and 3 elevators, as well as a tennis court, bowling alley, movie theater, jogging track, swimming pool, and putting green.
It's about 25,000 times as big as a Football field
In other words, 30,000 acres is 22,687.5 times the size of a Football field, and the size of a Football field is 0.00004407713499 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 1.322314050 acres. 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 0.54363183920 acres.