Acre [ac] to Square Kilometer [km2] Converter

Quick Reference

1 Acre (ac) = 0.004046860339 Square Kilometer (km2)

1 Square Kilometer (km2) = 247.1051423 Acre (ac)

How to Convert Acre to Square Kilometer

1 ac = 0.004046860338724812 km2
1 km2 = 247.10514233241506 ac

To convert Acre to Square Kilometer, divide the value by 247.1051423 (equivalently, multiply by 0.004046860339). To convert Square Kilometer back to Acre, multiply by 247.1051423.

Example: convert 10 ac to km2:
10 ac = 10 x 0.004046860338724812 = 0.04046860338724812 km2

↔ Convert Square Kilometer to Acre

Acre

Definition: An acre (ac) is a unit of area used in the imperial and US customary systems. It is equal to 43,560 square feet, or approximately 4,047 square meters.

History/origin: The acre has ancient origins, dating back to medieval England. It was originally defined as the area of land that a yoke of oxen could plow in a day.

Current use: Acres are commonly used in agriculture, land management, and real estate to measure larger areas of land. It's a prevalent unit in the United States and some other countries.

Square Kilometer

Definition: A square kilometer (km²) is a unit of area equal to a square that is 1 kilometer on each side. It is a multiple of the square meter, the SI unit of area.

History/origin: The square kilometer is derived from the kilometer, which is part of the metric system established in France in the late 18th century. The metric system was designed to be a standardized and coherent system of measurement based on decimal multiples.

Current use: Square kilometers are used to measure large areas, such as the size of cities, countries, lakes, and other geographical features. It's a common unit in geography, cartography, and environmental studies.

Acre to Square Kilometer Conversion Table

Acre [ac]	Square Kilometer [km2]
1 ac	0.004046860338724812 km2
2 ac	0.008093720677449625 km2
5 ac	0.02023430169362406 km2
10 ac	0.04046860338724812 km2
20 ac	0.08093720677449624 km2
50 ac	0.2023430169362406 km2
100 ac	0.4046860338724812 km2
200 ac	0.8093720677449624 km2
500 ac	2.023430169362406 km2
1000 ac	4.046860338724812 km2

Common pairs of Area

Square Millimeter

Square Millimeter to Centimeter Square Millimeter to Square Meter Square Millimeter to Hectare Square Millimeter to Square Kilometer Square Millimeter to Square Inch

Centimeter

Centimeter to Square Millimeter Centimeter to Square Meter Centimeter to Hectare Centimeter to Square Kilometer Centimeter to Square Inch

Square Meter

Square Meter to Square Millimeter Square Meter to Centimeter Square Meter to Hectare Square Meter to Square Kilometer Square Meter to Square Inch

Hectare

Hectare to Square Millimeter Hectare to Centimeter Hectare to Square Meter Hectare to Square Kilometer Hectare to Square Inch

Square Kilometer

Square Kilometer to Square Millimeter Square Kilometer to Centimeter Square Kilometer to Square Meter Square Kilometer to Hectare Square Kilometer to Square Inch

Square Inch

Square Inch to Square Millimeter Square Inch to Centimeter Square Inch to Square Meter Square Inch to Hectare Square Inch to Square Kilometer

Square Yard

Square Yard to Square Millimeter Square Yard to Centimeter Square Yard to Square Meter Square Yard to Hectare Square Yard to Square Kilometer

Square Foot

Square Foot to Square Millimeter Square Foot to Centimeter Square Foot to Square Meter Square Foot to Hectare Square Foot to Square Kilometer

Acre

Acre to Square Millimeter Acre to Centimeter Acre to Square Meter Acre to Hectare Acre to Square Kilometer

Square Mile

Square Mile to Square Millimeter Square Mile to Centimeter Square Mile to Square Meter Square Mile to Hectare Square Mile to Square Kilometer

Acre [ac] to Square Kilometer [km2] Converter

To convert Acre to Square Kilometer, enter your value in the ac field above and the result in km2 will appear instantly. You can also use the conversion factor shown in the table on this page to calculate manually. The formula is always the same: multiply your ac value by the fixed conversion ratio to get the equivalent in km2.

Our Acre to Square Kilometer converter uses standardized conversion factors defined by international scientific and metrological organizations. All calculations are performed with full floating-point precision. You can also choose how many decimal places to display in the result, so you get exactly the level of detail you need.

Yes, absolutely. Simply swap the source and destination units in the converter — select km2 as your input unit and ac as your output unit. The same precision and standardized conversion factor applies in both directions.

Converting between Acre and Square Kilometer comes up regularly in engineering, scientific research, construction, and everyday tasks that involve measurements from different unit systems. Our converter eliminates the risk of manual calculation errors and saves time whenever you need to switch between these two units.

Yes, the Acre to Square Kilometer converter is completely free. No account or registration is required, and there are no usage limits. It works on any device — smartphones, tablets, and desktop computers — directly in your browser.

Acre and Square Kilometer are both units used to measure the same physical quantity, but they belong to different measurement systems or represent different scales. The mathematical relationship between them is fixed and constant, which is what makes accurate conversion possible. Scroll up to see the exact conversion factor, formula, and a reference table for common values.

Acre [ac] to Square Kilometer [km2] Converter

Quick Reference

1 Acre (ac) = 0.004046860339 Square Kilometer (km2)

1 Square Kilometer (km2) = 247.1051423 Acre (ac)

How to Convert Acre to Square Kilometer

1 ac = 0.004046860338724812 km2
1 km2 = 247.10514233241506 ac

To convert Acre to Square Kilometer, divide the value by 247.1051423 (equivalently, multiply by 0.004046860339). To convert Square Kilometer back to Acre, multiply by 247.1051423.

Example: convert 10 ac to km2:
10 ac = 10 x 0.004046860338724812 = 0.04046860338724812 km2

↔ Convert Square Kilometer to Acre

Acre

Definition: An acre (ac) is a unit of area used in the imperial and US customary systems. It is equal to 43,560 square feet, or approximately 4,047 square meters.

History/origin: The acre has ancient origins, dating back to medieval England. It was originally defined as the area of land that a yoke of oxen could plow in a day.

Current use: Acres are commonly used in agriculture, land management, and real estate to measure larger areas of land. It's a prevalent unit in the United States and some other countries.

Square Kilometer

Definition: A square kilometer (km²) is a unit of area equal to a square that is 1 kilometer on each side. It is a multiple of the square meter, the SI unit of area.

Acre to Square Kilometer Conversion Table

Acre [ac]	Square Kilometer [km2]
1 ac	0.004046860338724812 km2
2 ac	0.008093720677449625 km2
5 ac	0.02023430169362406 km2
10 ac	0.04046860338724812 km2
20 ac	0.08093720677449624 km2
50 ac	0.2023430169362406 km2
100 ac	0.4046860338724812 km2
200 ac	0.8093720677449624 km2
500 ac	2.023430169362406 km2
1000 ac	4.046860338724812 km2