Online calculator to convert square miles to acres (mi2 to ac) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Area units.
Conversion Calculator
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Convert mi2 to acres
TIP: If the result of your conversion is 0, try increasing the "Decimals".
Conversion Definitions
The following is a list of definitions relating to conversions between square miles and acres.
What is a square mile (mi2)?
A square mile is a unit of area in both US Customary Units as well as the Imperial System. The symbol for square mile is mi2 or sq mi. There are 0.0015625 square miles in an acre. A square mile is calculated as the area of a square that has 1 mile on each side.
What is an acre (ac)?
An acre is a unit of area in both US Customary Units as well as the Imperial System. The symbol for acre is ac. There are 640 acres in a square mile.
Conversion Formula
Let's take a closer look at the conversion formula so that you can do these conversions yourself with a calculator or with an old-fashioned pencil and paper.
The formula to convert from mi2 to acres is:
acres = mi2 x 640
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from square miles to acres (mi2 to ac).
Square Mile to Acres Conversion Example
Task: Convert 4 square miles to acres (show work) Formula: mi2 x 640 = acres Calculations: 4 mi2 x 640 = 2,560 acres Result: 4 mi2 is equal to 2,560 acres
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from mi2 to acres.
Square Miles to Acres Conversion Chart
| square miles (mi2) | acres (ac) |
|---|---|
| 1 mi2 | 640 acres |
| 2 mi2 | 1,280 acres |
| 3 mi2 | 1,920 acres |
| 4 mi2 | 2,560 acres |
| 5 mi2 | 3,200 acres |
| 6 mi2 | 3,840 acres |
| 7 mi2 | 4,480 acres |
| 8 mi2 | 5,120 acres |
| 9 mi2 | 5,760 acres |
| 10 mi2 | 6,400 acres |
| 20 mi2 | 12,800 acres |
| 30 mi2 | 19,200 acres |
| 40 mi2 | 25,600 acres |
| 50 mi2 | 32,000 acres |
| 75 mi2 | 48,000 acres |
| 100 mi2 | 64,000 acres |
| 250 mi2 | 160,000 acres |
| 500 mi2 | 320,000 acres |
| 750 mi2 | 480,000 acres |
| 1,000 mi2 | 640,000 acres |
| 2,500 mi2 | 1,600,000 acres |
| 5,000 mi2 | 3,200,000 acres |
| 7,500 mi2 | 4,800,000 acres |
| 10,000 mi2 | 6,400,000 acres |
| 25,000 mi2 | 16,000,000 acres |
| 50,000 mi2 | 32,000,000 acres |
| 75,000 mi2 | 48,000,000 acres |
| 100,000 mi2 | 64,000,000 acres |
| 250,000 mi2 | 160,000,000 acres |
Related Units
This table provides a summary of the Area units within their respective measurement systems.
| Unit | Symbol | Measurement System |
|---|---|---|
| square inches | in2 or sq in | US Customary Units/Imperial System |
| square feet | ft2 or sq ft | US Customary Units/Imperial System |
| square yards | yd2 or sq yd | US Customary Units/Imperial System |
| acres | ac | US Customary Units/Imperial System |
| square miles | mi2 or sq mi | US Customary Units/Imperial System |
| square millimeters | mm2 | Metric System |
| square centimeters | cm2 | Metric System |
| square decimeters | dm2 | Metric System |
| square meters | m2 | Metric System |
| square decameters | dam2 | Metric System |
| square hectometers | hm2 | Metric System |
| hectares | ha | Metric System |
| square kilometers | km2 | Metric System |
Note: For area conversions, US Customary Units and the Imperial System are equivalent.
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