Acre to Square Mile Converter
One Acre equals 0.0015625 Square Mile (1 acre = 0.0015625 mi2). Multiply a Acre value by 0.0015625 to get the equivalent in Square Mile. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
mi2 = acre × 0.0015625
Multiply the Acre value by 0.0015625 to get the equivalent value in Square Mile.
Example Conversions
1 Acre (acre)
0.0015625 Square Mile (mi2)
5 Acre (acre)
0.0078125 Square Mile (mi2)
10 Acre (acre)
0.015625 Square Mile (mi2)
25 Acre (acre)
0.0390625 Square Mile (mi2)
100 Acre (acre)
0.15625 Square Mile (mi2)
Conversion Table
| Acre (acre) | Square Mile (mi2) |
|---|---|
| 0.1 | 0.00015625 |
| 0.5 | 0.00078125 |
| 1 | 0.0015625 |
| 2 | 0.003125 |
| 5 | 0.0078125 |
| 10 | 0.015625 |
| 25 | 0.0390625 |
| 50 | 0.078125 |
| 100 | 0.15625 |
| 250 | 0.390625 |
| 500 | 0.78125 |
| 1000 | 1.5625 |
How to Convert Manually
Use these steps to convert Acre values to Square Mile without the calculator.
- Write down the value in Acre (acre) that you want to convert.
- Multiply that value by 0.0015625.
- For example, 10 Acre × 0.0015625 = 0.015625 Square Mile.
- Label the result as Square Mile (mi2).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Acre and one Square Mile.
About Acre and Square Mile
The acre is 43,560 square feet, exactly 4,046.8564224 square meters — historically the area a yoke of oxen could plow in a day. US and UK land sales still quote it. The square mile is 640 acres, about 2.59 square kilometers. US geography uses it for counties, cities, and large land areas. One Acre equals 0.0015625 Square Mile (1 acre = 0.0015625 mi2). Acre to Square Mile conversion comes up most often in US and UK land sales and in farm and ranch sizes in the US, typically when figures need restating for US city and county areas.
Precision and Rounding: Area factors are the squares of exact length factors, so they are exact too (1 ft² = 0.09290304 m² precisely). Whole numbers usually suffice for rooms and land parcels; surveying and legal land descriptions carry four or more decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Acre equals 0.0234375 Square Mile.
15 acre × 0.0015625 = 0.0234375 mi2
FAQ
How do I convert Acre to Square Mile?
Multiply the Acre value by 0.0015625 to get the equivalent value in Square Mile.
What is the formula for Acre to Square Mile?
The formula is mi2 = acre × 0.0015625.
How many Square Mile are in 1 Acre?
1 Acre equals 0.0015625 Square Mile.
Can I convert Square Mile back to Acre?
Yes. 1 Square Mile equals 640 Acre, and the related converter can reverse the calculation.
What are common names for Acre and Square Mile?
Acre is shown as acre and may also be searched as acres. Square Mile is shown as mi2 and may also be searched as square miles, sq mi, mi².
Was this page helpful?
Let us know if this converter met your needs.