Area Unit Converter
Convert between square metres, kilometres, miles, acres, hectares, and more. Results update instantly.
Common conversions
- 1 hectare = 10,000 m² = 2.471 acres
- 1 km² = 100 hectares = 247.1 acres = 0.386 mi²
- 1 acre = 4,047 m² = 0.4047 hectares
- 1 mi² = 640 acres = 258.999 hectares
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What is the Area Unit Converter?
The Area Unit Converter converts between common area measurement units used in GIS, land surveying, agriculture, real estate, and environmental reporting. Supported units include square metres, square kilometres, hectares, acres, square miles, and square feet.
Area values from GIS software are often reported in square metres (the SI unit), but many workflows require reporting in hectares for agricultural land, acres for property in the US and UK, or square kilometres for large regions. This tool converts between all common combinations instantly.
Common use cases
Land registry and planning
Convert GIS-calculated area in square metres to hectares or acres for land registry documents, planning applications, or property listings.
Agricultural reporting
Convert farm field areas from square metres (as calculated by GIS) to hectares for subsidy applications, yield calculations, or crop rotation planning.
Environmental impact assessment
Express habitat or wetland areas in both SI units (ha) and local units (acres) for environmental impact reports requiring dual reporting.
GIS attribute conversion
Convert area values stored in a GIS attribute table from one unit to another for compatibility with a reporting template or external system.
Frequently asked questions
How many square metres are in a hectare?
One hectare equals 10,000 square metres (100 m × 100 m). Hectares are the standard unit for land area in most countries and in EU agricultural reporting. One square kilometre equals 100 hectares.
How does an acre compare to a hectare?
One acre equals approximately 0.4047 hectares, or 4,047 square metres. One hectare equals approximately 2.471 acres. Acres are used in the United States, United Kingdom, and some Commonwealth countries for land area measurement.
When should I use km² vs hectares?
Use square kilometres (km²) for large areas such as countries, regions, or large lakes — areas measured in hundreds or thousands of square kilometres. Use hectares for land parcels, farms, parks, and smaller properties — areas from less than one hectare to a few hundred hectares.
What area unit does GIS software report by default?
Most GIS software calculates area in the native unit of the data's coordinate system. For WGS 84 (geographic) data, this is square degrees (meaningless for area). For projected data, the native unit is typically square metres. Use this converter to express the result in a meaningful unit like hectares or acres.