Convert acres to square kilometers 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 kilometer covers a large metric area: one kilometer by one kilometer. Since each side is 1,000 meters, one km² contains 1,000,000 m².
History/origin: Large-scale mapping and public statistics needed a unit bigger than hectares or square meters, so km² became the common metric choice for regions and natural features.
Current use: Km² appears in geography, census tables, environmental reports, park descriptions, city profiles, and comparisons of islands, watersheds, forests, and countries.
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