Acre to Square Kilometer

Convert acre to square kilometer instantly. Type in either field — results update live.

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Area Acre Square Kilometer

1 acre = 0.0040468564224 square kilometers

From

Format

Selected ac values converted to km² using the exact factor from this tool.

Exact conversion factors in both directions, plus a worked example.

1 ac = 0.0040468564 km²

1 km² = 247.1053814672 ac

To convert acre to square kilometer, multiply by 0.0040468564.

To convert square kilometer to acre, multiply by 247.1053814672.

Example: convert 10 ac to km²

10 × 0.0040468564 = 0.0404685642 km²

Short background on the units used in this conversion.

An acre is 43,560 square feet, or exactly 4,046.8564224 square meters — a traditional land measure.

Acres parcel farmland, suburban lots, and parks in the United States, UK, and several Commonwealth countries.

A square kilometer is one million square meters — a convenient scale for towns, lakes, and protected areas.

Square kilometers appear on maps, census data, and environmental reports worldwide.

How many square kilometers are in one acre?

One acre equals 0.0040468564224 square kilometers. Multiply your acres value by 0.0040468564224 to convert to square kilometers.

What is the conversion formula?

km² = ac × 0.0040468564224

The reverse is ac = km² × 247.1053814672, using the same exact factors as this converter.

Is this Acre to Square Kilometer converter private?

Yes. All calculations run locally in your browser. Nothing you type is sent to a server.

Jump to any area conversion starting from acre — including the reverse direction and every other unit in our dataset.