How many square kilometers are in 1 acres?

1 acres (ac) is exactly 0.004047 square kilometers (km²).

How do I convert acres to square kilometers?

Multiply the value in acres by 0.004047 to get the result in square kilometers. Or use the converter above — type any number and see the result instantly.

Acres (ac) to Square kilometers (km²) Conversion

📐 Area - Converter ✓ Verified Accurate

From

Result

Acres

The acre is a unit of area equal to exactly 4,046.8564224 square metres, the standard unit for land measurement in the United States and United Kingdom. Its origin lies in medieval English agriculture: an acre was the amount of land a yoke of oxen could plough in a single day, standardised as a furlong (220 yards) long and a chain (22 yards) wide — exactly 43,560 square feet. One square mile contains exactly 640 acres.

Square kilometers

The square kilometre is a unit of area equal to one million square metres (10⁶ m²) and is the standard unit for expressing the surface areas of countries, cities, lakes, forests, and other large geographic features. Russia, the world's largest country, covers approximately 17.1 million km². The surface area of Earth is approximately 510.1 million km², of which about 70.8% is ocean.

Acres (ac) to Square kilometers (km²) - Conversion Table
Acres (ac)	Square kilometers (km²)
0.1 ac	0.00040468564224 km²
1 ac	0.0040468564224 km²
2 ac	0.0080937128448 km²
3 ac	0.0121405692672 km²
5 ac	0.020234282112 km²
10 ac	0.040468564224 km²
20 ac	0.080937128448 km²
30 ac	0.121405692672 km²
50 ac	0.20234282112 km²
100 ac	0.40468564224 km²
1000 ac	4.0468564224 km²

Convert Acres (ac) to other units of Area

List of Conversions
‣ Acres (ac) to square meters (m²)
‣ Acres (ac) to square kilometers (km²)
‣ Acres (ac) to square centimeters (cm²)
‣ Acres (ac) to square millimeters (mm²)
‣ Acres (ac) to square feet (ft²)
‣ Acres (ac) to square inches (in²)
‣ Acres (ac) to square yards (yd²)
‣ Acres (ac) to square miles (mi²)
‣ Acres (ac) to hectares (ha)