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Acre to Square Kilometer Converter

Instant, two-way conversion across common engineering units.

Free

1 ac = 0.0040468564 km²(Acre → Square kilometre)

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Converting acres to square kilometers

To convert acres to square kilometers, multiply the value by 0.0040468564. Area figures drive floor space schedules, finish quantities and cost per area, so both metric and imperial results are shown at full precision.

Visual scale

To scale
1 acre = 0.0040468564 square kilometers.
1 square kilometer = 247.10538 acres.

Acre (ac)

The acre is the traditional English land unit, equal to 43,560 square feet.

Origin
Originally the area a yoke of oxen could plough in a day, later fixed by statute and now defined from the international yard.
Where it is used
Used for land parcels, development sites and agricultural holdings in the US and UK.
Relation to SI
1 acre = 4,046.8564224 m², about 0.4047 ha.

Square Kilometer (km²)

The square kilometer (km²) measures large territories and urban districts.

Origin
The area of a square with 1 km sides, a decimal multiple of the square meter.
Where it is used
Used for regional planning, catchment analysis and mapping.
Relation to SI
1 km² = 1,000,000 m² = 100 ha.

Frequently asked questions

How many square kilometers are in one acre?

1 ac equals 0.0040468564 km².

How do I convert acres to square kilometers?

Multiply the value by 0.0040468564. For example, 10 ac equals 0.040468564 km².

How do I convert back from square kilometers to acres?

1 km² equals 247.10538 ac. The converter above works in both directions, so you can type into either field.

When should I use hectares instead of acres?

Hectares are the metric standard for site and land areas in most planning systems, while acres remain common in US and UK land records. Use whichever the local authority requires and quote the other in brackets.

How do I convert a length ratio into an area ratio?

Square the length factor. Because 1 ft = 0.3048 m, one square foot is 0.3048², which is 0.09290304 m².

Is this area converter free to use?

Yes. Every unit conversion runs in your browser, needs no account and is free for professional use.

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