Land Area Conversion: 1 square mile = 640 acres | 1 acre = 1/640 square miles | Default precision: 6 decimal places (for small land areas)
Accurate conversion between acres and square miles for land measurement, agriculture, real estate, and geographic applications.
Conversion Factors
1 square mile (sq mi) = 640 acres
1 acre = 0.0015625 square miles
An acre is a unit of land area used in the imperial and US customary systems. Originally defined as the area of one chain by one furlong (66 feet × 660 feet), it is now standardized as 43,560 square feet or approximately 4,047 square meters.
A square mile is a large unit of area equal to the area of a square with sides of one mile (5,280 feet) in length. It is commonly used for measuring large geographic areas such as cities, states, national parks, and countries.
| Acres | Square Miles | Acres | Square Miles |
|---|---|---|---|
| 1 | 0.0015625 | 1,000 | 1.5625 |
| 10 | 0.015625 | 2,500 | 3.90625 |
| 40 | 0.0625 | 5,000 | 7.8125 |
| 80 | 0.125 | 10,000 | 15.625 |
| 160 | 0.25 | 64,000 | 100 |
| 320 | 0.5 | 320,000 | 500 |
| 640 | 1.0 | 640,000 | 1,000 |
There are exactly 640 acres in one square mile. This conversion factor is standardized in both the imperial and US customary measurement systems, making it easy to convert between these two units for land area.
The 640-acre square mile originated from the Public Land Survey System (PLSS) established by the US government in the late 18th century. The system divided land into townships (6 miles × 6 miles = 36 square miles) and further into sections of 1 square mile each. Each section was then divided into 640 acres to facilitate land sales (1 acre was considered a manageable plot for a family farm).
Use acres for smaller land areas such as residential lots, farms, small parks, and individual properties. Use square miles for larger geographic areas such as cities (e.g., New York City is ~302 square miles), counties, states (e.g., Texas is ~268,597 square miles), national parks, and countries.
This converter uses the standardized 640 acres per square mile conversion factor, which is accurate for general purposes. However, for legal land transactions, property surveys, or official documentation, always consult a licensed surveyor or use official land records. Minor discrepancies may exist due to property boundaries, topographic features, or local measurement standards.
Yes! Use the "sq mi to Acres" button to switch the conversion direction. When in reverse mode, entering a value in square miles will calculate the equivalent area in acres using the formula: acres = square miles × 640. The quick conversion buttons will also update to show common square mile to acre values.
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