| Acres (ac) | Square Metres (m²) |
|---|
To convert acres to square metres, multiply by 4046.856. One acre is defined as 43,560 square feet, and since 1 foot = 0.3048 m, this gives:
The conversion factor is exact: 43,560 × 0.3048² = 4046.8564224 m² per acre.
Useful benchmarks for acres to square metres:
To convert acres to square metres, multiply the number of acres by 4046.856. One acre is defined as 43,560 square feet, and since one foot equals 0.3048 metres, one acre equals 43,560 × (0.3048)² = 4,046.856 m². This is the internationally agreed exact conversion factor.
For example, 5 acres = 5 × 4,046.856 = 20,234 m². A 100-acre farm equals 404,686 m², which is about 40.47 hectares. To reverse the conversion (m² back to acres), divide by 4,046.856 or multiply by 0.000247105.
Acres are the standard unit for land measurement in the United States, United Kingdom, and many other countries with imperial heritage. Square metres (and hectares) are the metric standard used across Europe, Australia, and internationally. You'll need this conversion when buying or valuing land, comparing property sizes internationally, working with GIS or mapping software, or reading planning and agricultural documentation.
One acre equals exactly 4,046.856 square metres. This comes from the definition: 1 acre = 43,560 sq ft, and 1 foot = 0.3048 m, so 1 acre = 43,560 × 0.3048² = 4,046.8564224 m².
One acre is approximately 63 metres × 64 metres — roughly the size of a standard international football pitch (which is typically 100 m × 68 m, or about 1.7 acres). It equals 4,047 m², 0.4047 hectares, or 43,560 sq ft.
Multiply the number of acres by 4046.856. For example, 2.5 acres = 2.5 × 4046.856 = 10,117 m². To convert back, divide by 4046.856 (or multiply by 0.000247).
1 hectare = 2.471 acres, or equivalently 1 acre = 0.4047 hectares. A hectare is 10,000 m² (100 m × 100 m), while an acre is 4,047 m².
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