Acres to Square Miles Converter
Convert acres (ac) to square miles (mi²)
Result
0.0015625 mi²
Square Miles
1 ac = 0.0015625 mi²
1 ac in other units
- 1Enter a valueType the number to convert
- 2Pick the unitsChoose what to convert from and to
- 3Read the resultSee it in every other unit too
How to convert acres to square miles
There are 640 acres in one square mile, so divide the number of acres by 640.
mi² = ac ÷ 640
1 ac = 0.0015625 mi² · 1 mi² = 640 ac
Worked example
To convert 5 acres to square miles: 5 ac ÷ 640 = 0.0078125 mi².
About acres (ac)
An acre is 43,560 square feet (about 4,047 m²). Agricultural land in India is commonly measured in acres.
About square miles (mi²)
A square mile is 640 acres, about 2.59 km².
More conversions
Acres to other units
Other units to Square Miles
Frequently asked questions
How many square miles are in one acre?
One acre equals 0.0015625 square miles.
How many acres are in one square mile?
One square mile equals 640 acres.
How do I convert acres to square miles?
Use the formula mi² = ac ÷ 640. For example, 5 ac ÷ 640 = 0.0078125 mi².