Square Mile (mi²)
Definition: A square mile (mi²) is an imperial unit of area equal to a square with sides of one mile.
History: Historically used in land surveying and property measurement in English-speaking countries.
Current Use: Commonly used to measure large geographical areas such as cities and national parks.
Acre (ac)
Definition: An acre is an imperial unit of area equal to 4,047 square meters or 0.4047 hectares.
History: Historically, an acre represented the area a team of oxen could plow in a day. It was formalized over centuries.
Current Use: Still widely used in the US and UK for real estate, agriculture, and land ownership.
Quick Conversion Table Square Mile (mi²) to Acre (ac)
1 Square Mile (mi²) equal to 640 Acre (ac)
5 Square Mile (mi²) equal to 3,200 Acre (ac)
10 Square Mile (mi²) equal to 6,400 Acre (ac)
20 Square Mile (mi²) equal to 12,800 Acre (ac)
30 Square Mile (mi²) equal to 19,200 Acre (ac)
50 Square Mile (mi²) equal to 32,000 Acre (ac)
75 Square Mile (mi²) equal to 48,000 Acre (ac)
100 Square Mile (mi²) equal to 64,000 Acre (ac)