Convert acres to square miles instantly.
Definition: An acre (symbol: ac) is a unit of land area equal to 4,046.8564224 square meters, 43,560 square feet, or 1/640 of a square mile.
History/origin: The acre dates back to medieval England, where it was roughly the amount of land a team of oxen could plough in a day. It remained a practical land unit even after formal standardization.
Current use: Acres are widely used in the United States, Canada, and the UK for farmland, rural property, estates, and large plots of land.
Definition: The square mile is a large imperial and US customary area unit. It covers a one-mile by one-mile square, equal to 27,878,400 ft² or 640 acres.
History/origin: Surveying, county records, and regional maps in mile-using countries made mi² a natural unit for describing broad territories before metric area units became widespread.
Current use: Mi² is common in US geography, municipal profiles, park statistics, lake areas, county data, population density figures, and comparisons of large places.
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