Acre to Square Mile Converter
Convert Acres to Square Miles
Quick Conversions
How to Convert Acres to Square Miles
To convert from acres (ac) to square miles (mi²), you divide the area in acres by 640. For more information about acres as a unit of measurement, visit our acres page.
Formula
Square Miles = Acres / 640
or
mi² = ac / 640
Step-by-step process
- Take the area in acres.
- Divide it by 640.
- The result is the equivalent area in square miles.
Examples
- 1 ac = 1 / 640 = 0.0015625 mi²
- 10 ac = 10 / 640 = 0.015625 mi²
- 100 ac = 100 / 640 = 0.15625 mi²
- 640 ac = 640 / 640 = 1 mi²
When to Convert Acres to Square Miles
This conversion is useful for measuring very large land areas, such as countries or large agricultural regions.
Geography and Cartography
Square miles are used to measure the area of large landmasses, such as countries, states, or large geographical regions.
Environmental Science
Environmental studies often involve analyzing large areas of land, such as ecosystems or conservation areas, where square miles are a suitable unit.
Common Acres to Square Miles Conversions
Here is a table of common conversions for quick reference:
| Acres (ac) | Square Miles (mi²) | Acres (ac) | Square Miles (mi²) |
|---|---|---|---|
| 1 | 0.0015625 | 100 | 0.15625 |
| 2 | 0.003125 | 200 | 0.3125 |
| 5 | 0.0078125 | 500 | 0.78125 |
| 10 | 0.015625 | 640 | 1 |
| 20 | 0.03125 | 1,000 | 1.5625 |
| 50 | 0.078125 | 5,000 | 7.8125 |
Frequently Asked Questions
How many square miles are in an acre?
There are approximately 0.0015625 square miles in an acre.
How do I convert square miles to acres?
To convert from square miles to acres, you multiply the area in square miles by 640. For example, 1 mi² is equal to 1 * 640 = 640 ac.