Land Area Conversion: 1 square mile = 640 acres | Essential for real estate, surveying, and geographic measurements
Accurate conversion between square miles and acres for land surveying, real estate, geography, and property planning. Get precise results with customizable decimal precision.
Conversion Factor
1 square mile (sq mi) = 640 acres | 1 acre = 0.0015625 square miles
Precision: 2 Decimal Places | Formula: acres = sq mi × 640
Understanding these essential land area units for real estate, surveying, and geographic planning.
Square Mile to Acre Conversion
1 square mile (sq mi) = 640 acres
1 acre = 0.0015625 square miles
Acres = Square Miles × 640
Square Miles = Acres × 0.0015625
Convert 0.5 square miles to acres:
acres = sq mi × 640
acres = 0.5 × 640
acres = 320 (with 0 decimal places)
Convert 1280 acres to square miles:
sq mi = acres × 0.0015625
sq mi = 1280 × 0.0015625
sq mi = 2 (with 0 decimal place)
Note: These conversions are standard for US customary and imperial land measurement systems
A unit of area equal to the area of a square with sides of one mile in length. It is widely used in the United States and other countries for measuring large land areas.
Equivalents:
Note: Also referred to as a "section" in US public land surveying (1 section = 1 sq mi)
A unit of area commonly used for measuring land, particularly in real estate and agriculture. One acre is equal to 43,560 square feet or 1/640 of a square mile.
Equivalents:
Note: US survey acres and international acres differ slightly (negligible for most uses)
| Square Miles | Acres | Square Feet | Hectares | Square Meters |
|---|---|---|---|---|
| 0.0015625 | 1 acre | 43,560 sq ft | 0.4047 ha | 4,046.86 sq m |
| 0.25 | 160 acres | 6,969,600 sq ft | 101.17 ha | 647,497 sq m |
| 0.5 | 320 acres | 13,939,200 sq ft | 202.34 ha | 1,294,994 sq m |
| 1 | 640 acres | 27,878,400 sq ft | 258.9988 ha | 2,589,988 sq m |
| 2 | 1,280 acres | 55,756,800 sq ft | 517.9976 ha | 5,179,976 sq m |
Common questions about square miles, acres, and land area conversions.
There are exactly 640 acres in one square mile. This is a standard conversion in both US customary and imperial measurement systems, and it is widely used in land surveying, real estate, and agriculture. The relationship can be expressed in multiple ways:
1 square mile (sq mi) = 640 acres
1 acre = 0.0015625 square miles
Square Miles to Acres: acres = sq mi × 640
Acres to Square Miles: sq mi = acres × 0.0015625
This conversion is critical for calculating large land areas, such as farms, forests, or real estate developments.
Square miles and acres are primarily used in countries that follow US customary or imperial measurement systems, and are not universal in the metric system:
This converter uses the standard US customary conversion (1 sq mi = 640 acres), which is the most commonly referenced conversion for global land-related tasks.
The survey acre and international acre are two slightly different variations of the acre unit, with minimal differences for most practical uses:
This converter uses the international acre conversion (1 sq mi = 640 international acres), which is suitable for 99% of user needs.
The 1 square mile = 640 acres conversion has historical roots in US public land surveying and traditional measurement systems:
This conversion has stood the test of time and remains the standard for land measurement in the United States, particularly for real estate and agricultural purposes.
This square mile to acre converter is ideal for real estate and farming tasks — here's how to use it effectively:
For legal or official purposes, always verify conversions with a licensed land surveyor to ensure compliance with local regulations.
Common land area measurements for real estate, surveying, and agricultural planning.
| Square Miles | Acres | Square Feet | Hectares | Common Uses |
|---|---|---|---|---|
| 0.0015625 | 1 acre | 43,560 sq ft | 0.4047 ha | Small residential lot |
| 0.0625 | 40 acres | 1,742,400 sq ft | 16.187 ha | Small farm or ranch |
| 0.25 | 160 acres | 6,969,600 sq ft | 101.17 ha | Quarter section (farm land) |
| 0.5 | 320 acres | 13,939,200 sq ft | 202.34 ha | Large farm or rural property |
| 1 | 640 acres | 27,878,400 sq ft | 258.9988 ha | 1 section (US surveying) |
| 2 | 1,280 acres | 55,756,800 sq ft | 517.9976 ha | Large ranch or forest tract |
| 4 | 2,560 acres | 111,513,600 sq ft | 1,035.995 ha | Commercial agricultural land |
| 10 | 6,400 acres | 278,784,000 sq ft | 2,589.988 ha | Regional park or wildlife reserve |
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