Unit Converters

Precision suite9 categories | metric & imperial

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square_foot

Area Conversion

From

Amount to Convert

Result

4.0469e-3km²

1 Acre = 4.0469e-3 Square Kilometer

infoAbout Area Tool

Surface area conversions between metric squares, hectares, acres, and imperial measurements.

Quick References

1 Square Meter to Square Foot10.76391505
1 Hectare to Acre2.47105163
1 Square Kilometer to Square Mile0.38610039

table_chartCommon Conversions

Square Millimeter4046860000.0000005 mm²

Square Centimeter40468600 cm²

Square Meter4046.86 m²

Square Kilometer4.0469e-3 km²

Hectare0.404686 ha

Square Inch6272645.54529109 in²

Acre to Square Kilometer Conversion Table

Acre (ac)	Square Kilometer (km²)
1 ac	4.0469e-3 km²
2 ac	8.0937e-3 km²
5 ac	0.0202343 km²
10 ac	0.0404686 km²
25 ac	0.1011715 km²
50 ac	0.202343 km²
100 ac	0.404686 km²
250 ac	1.011715 km²
500 ac	2.02343 km²
1000 ac	4.04686 km²

How to Convert Acre to Square Kilometer

Formula

Square Kilometer = Acre × 4.0469e-3

Worked Example

Example: 5 Acre = 5 × 4.0469e-3 = 0.0202343 Square Kilometer

To convert Acre to Square Kilometer, multiply the Acre value by 4.0469e-3. This factor is derived from the ratio between the two units.

About These Units

Acre

An acre is a unit of area equal to 43,560 square feet, 4,840 square yards, or approximately 4,047 square meters (0.4047 hectares). It is the primary unit for measuring land area in the United States and United Kingdom.

History

The acre originated in medieval England as the amount of land a yoke of oxen could plough in one day. The word comes from the Old English 'æcer,' meaning field. Despite metrication efforts, the acre remains the standard land measurement unit in the US, UK, and several Commonwealth countries.

km²

Square Kilometer

A square kilometer is a unit of area equal to 1,000,000 square meters or 100 hectares. It is used for measuring the area of cities, countries, lakes, and other large geographic regions. One square kilometer equals approximately 0.386 square miles.

History

The square kilometer is derived from the kilometer. It is the standard unit for expressing the area of countries and large geographic features. For example, France covers approximately 640,679 km² and the United States covers approximately 9,833,520 km².

Frequently Asked Questions

Related Area Conversions

arrow_forwardAcre to Square Millimeter arrow_forwardAcre to Square Centimeter arrow_forwardAcre to Square Meter arrow_forwardAcre to Hectare arrow_forwardAcre to Square Inch arrow_forwardAcre to Square Foot arrow_forwardSquare Millimeter to Square Kilometer arrow_forwardSquare Centimeter to Square Kilometer arrow_forwardSquare Meter to Square Kilometer arrow_forwardHectare to Square Kilometer arrow_forwardSquare Inch to Square Kilometer arrow_forwardSquare Foot to Square Kilometer

Why use NexaConvert for Units?

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Scientific Accuracy

Calculated using the latest NIST standards for physical constants and unit ratios.

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Instant Execution

No reload required. Get your results in real-time as you type or change units.

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Cross-Device

A responsive precision tool that fits in your pocket or dominates your desktop.

How these conversions work

Each category converts first through a base unit, then into the destination unit. That keeps the math consistent across metric and imperial systems and makes it easier to explain how results are generated.

When to double-check

Use these tools for planning, study, and everyday reference. For regulated, medical, engineering, or procurement work, confirm requirements against the official standard or specification you are working from.

Acre (ac)

Square Kilometer (km²)

1 ac

4.0469e-3 km²

2 ac

8.0937e-3 km²

5 ac

0.0202343 km²

10 ac

0.0404686 km²

25 ac

0.1011715 km²

50 ac

0.202343 km²

100 ac

0.404686 km²

250 ac

1.011715 km²

500 ac

2.02343 km²

1000 ac

4.04686 km²

About These Units

Acre

History

km²

Square Kilometer

History

Why use NexaConvert for Units?

verified

Scientific Accuracy

Calculated using the latest NIST standards for physical constants and unit ratios.

bolt

Instant Execution

No reload required. Get your results in real-time as you type or change units.

devices

Cross-Device

A responsive precision tool that fits in your pocket or dominates your desktop.