Enter the number of acres into the calculator to convert the area into square miles. This calculator provides a quick conversion based on the standard measurement that 1 square mile is equal to 640 acres.
Acres to Square Miles Formula
The formula used to convert acres to square miles is:
SM = A / 640
Variables:
- SM is the area in square miles
- A is the area in acres
To calculate the area in square miles, divide the area in acres by 640.
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) = 1280 acres