Square Metres (m²)
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Equivalent area
Accurate area conversion between acres (ac) and square metres (m²)
Convert acres to square metres instantly with precise calculations. Includes reverse square metres to acres conversion, hectares, square kilometres, square feet, and square yards outputs, full formula reference, and area conversion tables for 2026.
Professional area conversion for real estate, agriculture, land surveying, urban planning, environmental science, and property development in 2026
Convert acres to square metres using the exact international definition: 1 international acre = 4,046.8564224 m² (exactly 43,560 square feet, derived from the 1959 international foot of 0.3048 m: 1 ac = 43,560 ft² × 0.3048² = 43,560 × 0.09290304 = 4,046.8564224 m² exactly). Our tool delivers precise results across six area units simultaneously — m², hectares, km², square feet, square yards, and square miles — giving you a complete multi-unit breakdown from a single input value, essential for real estate transactions, agricultural planning, and land surveying in 2026.
Switch seamlessly between acres to square metres and square metres to acres conversion modes. Whether you are converting a rural property listing from acres to hectares for a metric country buyer, translating a US farmland area from acres to square metres for an engineering report, converting a land title from square metres to acres for an American investor, expressing a national park area in both acres and square kilometres for an environmental report, or comparing property sizes listed in different unit systems, both directions are covered instantly from a single input without manual calculation in 2026.
Essential for residential and rural real estate (property listings, valuations, conveyancing), agriculture and farming (crop planning, irrigation, yield calculations), land surveying and cadastral mapping, urban and regional planning, environmental impact assessment, golf course and sports ground design, national park and conservation area management, forestry and carbon credit calculations, infrastructure and construction site planning, and any professional or personal context where the imperial acre must be converted to the metric square metre, hectare, or square kilometre for Australian, European, or international use in 2026.
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The acre (ac) is a unit of area in the imperial and US customary systems, defined since 1959 as exactly 43,560 square feet — which, using the international foot of exactly 0.3048 metres, equals exactly 4,046.8564224 square metres. The square metre (m²) is the SI unit of area, defined as the area of a square with sides of exactly one metre. One acre is therefore equal to 4,046.8564224 m², and one square metre equals 1 ÷ 4,046.8564224 = 0.000247105381 acres. A commonly used approximate relationship is 1 hectare ≈ 2.471 acres (since 1 ha = 10,000 m², and 10,000 ÷ 4,046.8564224 = 2.47105381 acres exactly).
The word "acre" derives from the Old English æcer, originally meaning "open field." Historically, one acre was the area a yoke of oxen could plough in one day — approximately 1 furlong (220 yards) long by 1 chain (22 yards) wide = 4,840 square yards = 43,560 square feet. This historical definition survived into modern use via the imperial system. Today, the acre remains widely used in real estate and agriculture in the United States, United Kingdom, Canada, and India, while Australia, the EU, and most of the world have adopted the hectare (ha = 10,000 m²) as the standard unit for land area. Converting acres to square metres or hectares is a daily necessity for Australian property professionals, agricultural consultants, and anyone working across imperial and metric land measurement systems in 2026. See NIST for official unit definitions at nist.gov.
1 acre = 43,560 ft² = 4,840 yd² = 4,046.8564224 m² = 0.404686 ha. 2.47105 acres = 1 hectare. 640 acres = 1 square mile = 258.999 hectares = 2.58999 km².
The table below covers the most commonly needed acre values for square metre conversion in real estate, agriculture, land surveying, and property development in 2026.
| Acres (ac) | Square Metres (m²) | Hectares (ha) | Square Feet (ft²) | Common Reference |
|---|---|---|---|---|
| 0.01 ac | 40.469 m² | 0.004047 ha | 435.6 ft² | Small suburban block corner |
| 0.1 ac | 404.686 m² | 0.04047 ha | 4,356 ft² | Typical small suburban lot |
| 0.25 ac | 1,011.714 m² | 0.10117 ha | 10,890 ft² | Quarter acre — classic suburban block |
| 0.5 ac | 2,023.428 m² | 0.20234 ha | 21,780 ft² | Half acre residential block |
| 1 ac | 4,046.856 m² | 0.40469 ha | 43,560 ft² | 1 acre — standard reference |
| 1.5 ac | 6,070.285 m² | 0.60703 ha | 65,340 ft² | Large residential property |
| 2 ac | 8,093.713 m² | 0.80937 ha | 87,120 ft² | Small hobby farm plot |
| 2.471 ac | 10,000 m² | 1.000 ha | 107,639 ft² | 1 hectare exactly |
| 5 ac | 20,234.282 m² | 2.02343 ha | 217,800 ft² | Small farm / large acreage block |
| 10 ac | 40,468.564 m² | 4.04686 ha | 435,600 ft² | Small market garden / hobby farm |
| 20 ac | 80,937.128 m² | 8.09371 ha | 871,200 ft² | Medium rural property |
| 50 ac | 202,342.820 m² | 20.2343 ha | 2,178,000 ft² | Small farm |
| 100 ac | 404,685.642 m² | 40.4686 ha | 4,356,000 ft² | Medium farm / golf course |
| 247.105 ac | 1,000,000 m² | 100 ha | 10,763,910 ft² | 1 km² = 100 hectares |
| 640 ac | 2,589,988 m² | 258.999 ha | 27,878,400 ft² | 1 square mile (section) |
Use this reverse table when working with metric area data in square metres or hectares that needs to be expressed in acres for US or UK property listings, agricultural contracts, or international land transactions in 2026.
| Square Metres (m²) | Acres (ac) | Hectares (ha) | Square Feet (ft²) | Common Reference |
|---|---|---|---|---|
| 100 m² | 0.02471 ac | 0.010 ha | 1,076.39 ft² | Small unit / apartment footprint |
| 500 m² | 0.12355 ac | 0.050 ha | 5,381.96 ft² | Standard suburban residential lot |
| 700 m² | 0.17297 ac | 0.070 ha | 7,534.74 ft² | Large suburban block (AU) |
| 1,000 m² | 0.24711 ac | 0.100 ha | 10,763.91 ft² | 1 decare (1,000 m²) |
| 2,000 m² | 0.49421 ac | 0.200 ha | 21,527.82 ft² | Half hectare approx |
| 4,046.856 m² | 1 ac | 0.40469 ha | 43,560 ft² | 1 acre exactly |
| 10,000 m² | 2.47105 ac | 1 ha | 107,639.1 ft² | 1 hectare exactly |
| 20,000 m² | 4.94211 ac | 2 ha | 215,278.2 ft² | 2 hectares |
| 50,000 m² | 12.3553 ac | 5 ha | 538,196 ft² | 5 hectares — small farm |
| 100,000 m² | 24.7105 ac | 10 ha | 1,076,391 ft² | 10 hectares |
| 250,000 m² | 61.776 ac | 25 ha | 2,690,978 ft² | Small station / large farm |
| 1,000,000 m² | 247.105 ac | 100 ha | 10,763,910 ft² | 1 km² = 100 ha |
| 10,000,000 m² | 2,471.05 ac | 1,000 ha | 107,639,104 ft² | 1,000 hectares — large station |
The acre-to-square metre conversion bridges imperial and metric land measurement systems across real estate, agriculture, environmental science, and infrastructure planning worldwide.
Australian residential property is routinely described in square metres, while many rural and acreage properties are listed in acres — a legacy of British imperial measurement that persisted in Australian property markets well after metrication in the 1970s. A "quarter-acre block," the archetypal Australian suburban lot, equals 1,011.71 m² (approximately 1,012 m²). Properties listed in the US or UK in acres must be converted to square metres or hectares for Australian buyers, valuers, and conveyancers. A 5-acre rural residential property = 20,234 m² = 2.023 hectares. Real estate agents, property lawyers, and mortgage brokers in Australia routinely perform this conversion daily in 2026.
Australian agriculture uses both hectares (official metric unit for farm area) and acres (retained informally, especially among older farmers and in some commodity markets). Crop yields are reported in tonnes per hectare (t/ha) by Australian agencies but in bushels per acre by US and Canadian counterparts — converting farm areas from acres to hectares is essential for comparing international agricultural productivity data. A 1,000-acre wheat farm = 404.686 hectares = 404,685.64 m². Irrigation allocations, fertiliser rates, and pesticide application rates all require accurate area conversions between acres and hectares for Australian farming operations in 2026.
A standard 18-hole golf course covers approximately 100–150 acres (40.47–60.70 hectares = 404,686–607,029 m²). A standard AFL (Australian Rules Football) playing surface is approximately 135–185 metres long × 110–155 metres wide — roughly 1.48–2.87 hectares (3.66–7.09 acres). An NRL rugby league field (100m × 68m) = 6,800 m² = 0.68 ha = 1.68 acres. Olympic athletics tracks enclose an infield of approximately 1 hectare (2.47 acres). Sports facility planners, councils, and architects in Australia use both acres (for international comparisons) and square metres or hectares (for Australian planning documents) when designing and approving sports grounds in 2026.
Australian forest carbon credits (Australian Carbon Credit Units — ACCUs) are calculated on a per-hectare basis under the Carbon Credits (Carbon Farming Initiative) Act 2011, while international carbon markets and some US forestry data use acres. Converting forestry project areas from acres to hectares is essential for Australian carbon farming project developers working with international data, US forestry literature, or global carbon market platforms. A 1,000-acre reforestation project = 404.686 hectares. Australia's total forest area of approximately 134 million hectares equals roughly 331 million acres. Carbon abatement calculations, biomass estimates, and species diversity assessments all require accurate acre-to-hectare conversion in 2026.
Australian urban planning legislation, zoning codes, and development approvals use square metres and hectares as the standard area units, while many international development standards, US planning documents, and investment prospectuses use acres. A typical Australian greenfield residential subdivision of 100 hectares = 247.1 acres would be described in acres in a US investment memorandum but in hectares in an Australian DA (development application). Industrial estate lots are typically 2,000–10,000 m² (0.494–2.471 ac); large-format retail centres occupy 5–20 hectares (12.4–49.4 acres). Urban planners, property developers, and local government authorities need both units available simultaneously in 2026.
Australian national parks and conservation areas are measured in hectares and square kilometres in official government publications, while international conservation organisations and some research papers use acres. Kakadu National Park (NT) covers approximately 1,980,400 hectares (4,892,000 acres). The Great Barrier Reef Marine Park covers approximately 34.4 million hectares (85 million acres). Conservation biology research papers often report habitat loss, species range, and protected area statistics in both hectares and acres to serve international audiences. Environmental scientists, park rangers, and conservation policy officers routinely convert between acres and hectares when synthesising global and Australian conservation data in 2026.
Acres to m²: Multiply acres by 4,047 for a close approximation (true value 4,046.8564224 — error <0.004%). Quick examples: 1 ac ≈ 4,047 m², 5 ac ≈ 20,235 m², 10 ac ≈ 40,470 m². Acres to hectares: Multiply acres by 0.4047 — or use the approximate rule: 5 acres ≈ 2 hectares (true ratio is 1 ha = 2.471 ac, so 5 ac = 2.024 ha — error <1.2%). Hectares to acres: Multiply hectares by 2.471 — or use the rule: 2 hectares ≈ 5 acres (error <1.2%). Key memory anchors: 1 acre ≈ 4,047 m², 1 ha = 10,000 m² = 2.471 ac, 1 km² = 100 ha = 247.1 ac, 640 acres = 1 square mile.
Converting acres to square metres requires a single multiplication by 4,046.8564224. Here is the complete step-by-step process including all related area units.
The international acre (4,046.8564224 m²) used in this converter is the standard in all modern property transactions, surveying, and scientific work in Australia, the US, UK, Canada, and internationally since the 1959 international yard and pound agreement. However, be aware of the US survey acre (4,046.872610 m²) — very slightly larger, defined using the older US survey foot (1 survey foot = 1200/3937 m = 0.30480060960... m) rather than the international foot (0.3048 m exactly). The difference is approximately 0.004% — about 0.016 m² per acre — negligible for most purposes but relevant in historical US land records, cadastral surveys based on the US Public Land Survey System (PLSS), and legal descriptions in some US states. The US survey foot was officially deprecated in favour of the international foot by NIST in 2023, so US survey acres will become obsolete in new surveys, but may appear in older property records in 2026.
The international acre is defined as exactly 43,560 square feet (4,046.8564224 m²), established by the International Yard and Pound Agreement of 1959 signed by Australia, Canada, New Zealand, South Africa, the United Kingdom, and the United States. This replaced various slightly different national acre definitions with a single universal standard. The acre is one of the few imperial units still in widespread use in Australian rural property markets, agriculture, and some planning contexts in 2026, despite Australia's general adoption of metric units following the Metric Conversion Act 1970 and the transition period of the 1970s–1980s.
NIST Area Units →Australia officially adopted the metric system under the Metric Conversion Act 1970, with land measurement transitioning from acres to hectares during the 1970s–1980s. Australian property titles, planning documents, and agricultural statistics now use square metres, hectares, and square kilometres exclusively in official contexts. However, acres persist informally in rural real estate listings, farming conversations, and some media coverage of property markets. The Australian Bureau of Statistics (ABS), Geoscience Australia, and state land registries all use metric area units exclusively for official cadastral and statistical purposes in 2026.
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