Convert acre to square kilometer
acre
Definition: An acre (symbol: ac) is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (66 feet) by 1 furlong (660 feet), which is exactly equal to 1/640 of a square mile, 43,560 square feet, or exactly 4046.8564224 square meters.
History/origin: In the Middle Ages, the acre was defined as the area that a yoke (pair) of oxen could typically plow within one day, using a wooden plow. Before the metric system was adopted, many countries used their own versions of the acre. The most commonly used acre today, the international acre, is based on the international yard, which was defined in 1959.
Current use: Acres are used in countries including the United States, the UK, Ghana, India, Canada, and others. The United States (US) uses both international as well as US survey acres (~4047 square meters), which vary based on which type of yard is used in the measurement. However, area measurements are typically not accurate enough for the difference between the two acre measurements to be detectable.
square kilometer
Definition: Square kilometer is a measure of area, the extent of a two-dimensional surface. For conversion purposes, its value is 1000000 times the reference unit, square meter.
acre to square kilometer Conversion Table
| acre [ac] | square kilometer [km^2] |
|---|---|
| 0.01 acre | 0.000040 square kilometer |
| 0.10 acre | 0.000405 square kilometer |
| 1 acre | 0.004047 square kilometer |
| 2 acre | 0.008094 square kilometer |
| 3 acre | 0.0121 square kilometer |
| 5 acre | 0.0202 square kilometer |
| 10 acre | 0.0405 square kilometer |
| 20 acre | 0.0809 square kilometer |
| 50 acre | 0.2023 square kilometer |
| 100 acre | 0.4047 square kilometer |
| 1000 acre | 4.05 square kilometer |
How to Convert acre to square kilometer
1 acre = 0.004047 square kilometer
1 square kilometer = 247.11 acre
Example
Convert 15 acre to square kilometer:
15 acre = 15 × 0.004047 square kilometer = 0.060703 square kilometer
