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.
Area Converter
square feet to acres, sq ft to acres, square feet to acre converter, sq ft to acre calculator, land area conversion, property measurement tool
Free online square feet to acres converter: Instantly convert square feet (sq ft) to acres for real estate, land measurement, and property calculations. Get accurate results with conversion formula and reference table.
acre to sq ft, acres to square feet, acre converter, land area conversion, real estate measurement, property size calculator
Free online acre to sq ft converter: Instantly convert acres to square feet for land measurements, real estate, and property calculations. Get accurate results with conversion formula and reference table.
acres to square feet, acres to sqft, acre to sqft, convert ac to sq ft, acre to square foot conversion, area converter, ac to sq ft calculator
Accurate acres to square feet converter (1 acre = 43560 square feet). Easily convert between ac and sq ft for real estate, land measurement, and property calculations.
sq ft to sq m, square feet to square meters, sq ft to m² converter, area conversion, imperial to metric area, sqft to sqm, sq ft to m2, square feet en m2, ft2 to m2, sqfeet to square meter, sq feet to
Accurately convert square feet to square meters (sq ft to sq m) with our free online calculator. Ideal for real estate, construction, and area measurement needs.
acres to hectares, acre to hectare converter, area conversion, land measurement calculator, acres to hectares conversion, ekar to hektar, acres to hektar, acres hektar
Easily convert acres to hectares with our precise area conversion calculator. Perfect for real estate, agriculture, and land measurement applications.
sq m to sq ft, square meters to square feet, area conversion, real estate measurements, how many sq ft in a sq m, m2 to ft2, sq meter to sq ft, m2 to sq ft, sq mt to sq ft, sqm to sqft, m in sq ft, me
Convert sq m to sq ft (square meters to square feet) with our accurate calculator. Learn the conversion factor (1 sq m = 10.7639 sq ft) for real estate and construction measurements.
acres to square miles, acres to sq mi, square miles to acres, land area converter, acres to miles, acres to sq miles, acres and miles, how many acres in a square mile
Convert acres to square miles and vice versa with high precision. Ideal for land measurement, agriculture, and real estate applications.
hectares to acres, acres to hectares, area converter, land measurement, hectare to acre conversion, ha and acre, hektar to ekar, hektar in acre, ha to ac
Accurate conversion between hectares and acres for land measurement, real estate, agriculture, and environmental applications. Supports adjustable precision and conversion history.
Don't see the tool you need? Let us know via email, and we'll consider adding it.
869241891@qq.com