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Sources and Accuracy
Area conversions are derived from squared length relationships, using square metre as the reference unit and fixed factors such as 1 square foot = 0.09290304 square metre.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
hectare [ha]
Definition
The hectare is a metric land area unit equal to 10,000 square meters.
History
Hectares were adopted with metric land measurement because they are convenient for fields and parcels.
Current use
Hectares are used for agriculture, land records, forestry, environmental reporting, and large property areas.
acre [ac]
Definition
The acre is a land area unit equal to 43,560 square feet or about 4046.856 square meters.
History
The acre has agricultural origins and became a standard land measure in customary systems.
Current use
Acres are used for land parcels, farms, real estate, parks, and property planning.