How do I convert Acre to Square kilometer (km²)?

1 acre equals 0.004047 km2 using SI-based conversion and precise factors.

What is the formula to convert Acre to Square kilometer (km²)?

This is a linear unit conversion using a constant factor between units.

How can I share a direct acre to km2 result?

Use the shareable URL: https://measurecalc.com/convert/acre-to-square-kilometer/1

Convert Acre to Square kilometer (km²)

Q: Is Acre to Square kilometer (km²) conversion exact?

Yes, it uses exact definitions or standardized constants (e.g., 1 in = 25.4 mm).

Category: Area

Value From To Precision

0.004047 km2

1 acre = 0.004047 km2

High-precision rounding: 6 decimals

How to convert acre to square kilometer (km²)

Area equals length squared. It appears in real estate, land management, material takeoffs, and GIS. Square meters are SI standard; acres and hectares are common for land reporting in different regions.

This converter calculates Acre to Square kilometer (km²) values by using the correct conversion rule for the Area category. For linear units, standardized factors are used. For temperature, the calculator applies the proper formula with offsets.

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Quick conversion table

Handy values for Acre to Square kilometer (km²). Click a value to open that exact result.

Acre	Square kilometer (km²)
1	0.004047
0.5	0.002023
2.5	0.010117
10	0.040469

Conversion formula

Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).

Common mistakes

Squaring a length conversion factor incorrectly or forgetting to square it.

Unit facts

Acre: An acre is exactly 4,046.8564224 m²; traditional land measure in the Anglosphere.

About Acre

Acre

Exactly 4,046.8564224 m². Traditional land area in US/UK real estate and agriculture.

History: Medieval origins as the area ploughable in a day; later standardized to a fixed metric value.

About Square kilometer (km²)

Square kilometer (km²) is a unit used within the Area category.

Frequently asked questions

How many Square kilometer (km²) are in one Acre?

1 Acre equals 0.004047 Square kilometer (km²).

Is Acre to Square kilometer (km²) conversion exact?

Many unit conversions are exact by definition, while others use standardized conversion constants.

What is the fastest way to convert Acre to Square kilometer (km²)?

Enter a value in Acre, choose Square kilometer (km²) as the target unit, and the calculator will instantly return the result.

Convert Acre to other units

acre → ha Hectare (ha)
acre → ft2 Square foot (ft²)
acre → m2 Square meter (m²)
acre → yd2 Square yard (yd²)

Convert other units to Square kilometer (km²)

ha → km2 Hectare (ha)
ft2 → km2 Square foot (ft²)
m2 → km2 Square meter (m²)
yd2 → km2 Square yard (yd²)