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square kilometer (km2) → acre (acre)

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Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

0
km2=acre
0.01=2.471052
0.1=24.710516
1=247.105163
2=494.210326
3=741.315489
5=1,235.5258
10=2,471.0516
20=4,942.1033
50=12,355.2582
100=24,710.5163
1000=247,105.163

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Brief explanation: square kilometer to acre

Square meter is the base unit for area. Hectare = 10,000 m². Acre ≈ 4047 m². Square foot = 0.093 m². Square km = 1 million m². Area measures two-dimensional space. Hectares are used for land (farms, parks). Acres are common in the US and UK for real estate. Square feet are standard for room sizes. When converting, remember area uses squared units—so 1 m² = 10.76 ft².

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Common conversion examples: square kilometer to acre

Reference values for quick comparison. Use the converter above for any amount.

  • 1 square kilometer=247.1052 acre
  • 10 square kilometer=2,471.0516 acre
  • 100 square kilometer=24,710.5163 acre

About the Units

square kilometer (km2)

Definition: A square kilometer (km²) is a unit of area equal to 1,000,000 square meters. It is used for large areas such as cities, countries, and lakes.
History: The square kilometer emerged for geographical and administrative areas. It simplified expression of large land areas without excessive zeros.
Current use: Square kilometers are used for country size, city area, and park size. Geographical and demographic data use km². One km² is about 0.386 square miles.

acre (acre)

Definition: An acre is a unit of area used in the imperial and US systems. One acre equals 4,046.86 square meters or about 0.405 hectares. It was traditionally the area a yoke of oxen could plow in a day.
History: The acre has medieval English origins. It was standardized for land measurement and taxation. The international acre was defined in 1959 for consistency.
Current use: Acres are used for land area in the US, UK, and some Commonwealth countries. Real estate, farming, and forestry use acres. Most countries use hectares.

Sources

Conversion factors and unit definitions follow international standards. For authoritative references, see: