12,000 acres = 48.56 km2
0.275 acres
16,753,745 acres per 67,800 square km
Greater London covers an area of 1,579 sq. km (390,179 acres) The City of London covers about 26 sq. km (6,424 acres)
One acre is 43,560 square feet. Therefore, 12000 sq. ft is only 0.275 of one acre.
The CIA factbook lists Australia at 7,617,930 sq km of land [1] Converting to acres: 7,617,930 sq km = 1.8824315 × 10^9 acres [2] 1.88 billion acres of land [1] https://www.cia.gov/library/publications/the-world-factbook/geos/as.html#Geo [2] http://www.google.com/search?&q=7,617,930+sq+km+in+acres
1 (sq kilometer) = 247.105381 acres
80.937 sq km
The state of Virginia encompasses about 27,375,488 acres.
3.1 square kilometers is about 766 (766.026683)acres.
1 sq km = 100 hectares. 1 sq mile = 2.59 sq km so 509 hectares = 5.09 sq km = 1.97 sq mile. You might also like to remember that 1 sq mile = 640 acres, and 1 hectare = 2.47 acres
89.03 sq km
1 million acres = 4046.856 sq km (to 3 dp).