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acre (acre) → hectare (ha)

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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
acre=ha
0.01=0.004047
0.1=0.040469
1=0.404686
2=0.809372
3=1.214058
5=2.02343
10=4.04686
20=8.09372
50=20.2343
100=40.4686
1000=404.686

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Brief explanation: acre to hectare

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: acre to hectare

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

  • 1 acre=0.4047 hectare
  • 10 acre=4.0469 hectare
  • 100 acre=40.4686 hectare

About the Units

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.

hectare (ha)

Definition: A hectare (ha) is a unit of area equal to 10,000 square meters or 0.01 square kilometers. It is commonly used for agricultural land and forestry.
History: The hectare was adopted in 1795 as part of the metric system. The name combines the Greek hecto- (hundred) with are (100 m²). It became the standard for agricultural land in metric countries.
Current use: Hectares are used for farmland, vineyards, and forest area. Real estate for agricultural land uses hectares. One hectare is approximately 2.47 acres.

Sources

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