Convert land area between acres and square miles, with hectares, square feet, square meters, square kilometers and square yards. Square-side mode also estimates linear distance under an explicit square-parcel assumption.
| Acres to Square Miles | Square Miles to Acres |
|---|---|
| 1 acre = 0.0015625 sq mi | 0.01 sq mi = 6.4 acres |
| 2 acres = 0.003125 sq mi | 0.02 sq mi = 12.8 acres |
| 5 acres = 0.0078125 sq mi | 0.05 sq mi = 32 acres |
| 10 acres = 0.015625 sq mi | 0.1 sq mi = 64 acres |
| 20 acres = 0.03125 sq mi | 0.125 sq mi = 80 acres |
| 40 acres = 0.0625 sq mi | 0.25 sq mi = 160 acres |
| 50 acres = 0.078125 sq mi | 0.5 sq mi = 320 acres |
| 80 acres = 0.125 sq mi | 0.75 sq mi = 480 acres |
| 100 acres = 0.15625 sq mi | 1 sq mi = 640 acres |
| 120 acres = 0.1875 sq mi | 1.5 sq mi = 960 acres |
| 160 acres = 0.25 sq mi | 2 sq mi = 1,280 acres |
| 200 acres = 0.3125 sq mi | 2.5 sq mi = 1,600 acres |
| 320 acres = 0.5 sq mi | 5 sq mi = 3,200 acres |
| 400 acres = 0.625 sq mi | 10 sq mi = 6,400 acres |
| 500 acres = 0.78125 sq mi | 20 sq mi = 12,800 acres |
| 640 acres = 1 sq mi | 50 sq mi = 32,000 acres |
| 1,000 acres = 1.5625 sq mi | 100 sq mi = 64,000 acres |
| 1,500 acres = 2.34375 sq mi | 150 sq mi = 96,000 acres |
| 2,000 acres = 3.125 sq mi | 200 sq mi = 128,000 acres |
| 5,000 acres = 7.8125 sq mi | 500 sq mi = 320,000 acres |
| Formulas: sq mi = acres ÷ 640 and acres = sq mi × 640. | |
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Acres to Square Miles Formula
The formula used to convert acres to square miles is:
Variables:
- SM is the area in square miles
- A is the area in acres
To calculate area in square miles, divide acres by 640. Reverse conversion multiplies square miles by 640. For a perfect square only, side distance in miles = √(acres /640) and perimeter = 4 × side. An area conversion does not determine the dimensions of an arbitrary parcel. Use the unit selector for other area inputs. Display precision is adjustable; positive results that would round to zero are labeled below the selected precision increment.
What is an Acre?
An acre is a unit of area commonly used in the United States and the United Kingdom. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet), which is exactly equal to 1/640 of a square mile, about 40% of a hectare, or 4,840 square yards.
How to Calculate Acres to Square Miles?
The following steps outline how to calculate the area in square miles from acres.
- First, determine the area in acres (A).
- Next, use the formula SM = A / 640.
- Finally, calculate the area in square miles (SM).
- After inserting the variable and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variable as an example problem to test your knowledge.
Area in acres (A) = 1,280 acres. SM = 1,280 /640 = 2 square miles. If the parcel is a square, each side is √2 ≈ 1.414214 miles.
