Online calculator to convert acres to square kilometers (ac to km2) with formulas, examples, and tables. Our conversions provide a quick and easy way to convert between Area units.
Conversion Calculator
Enter your value in the conversion calculator below.
Convert acres to km2
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 acres and square kilometers.
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 247.10538161 acres in a square kilometer.
What is a square kilometer (km2)?
A square kilometer is a unit of area in the Metric System. The symbol for square kilometer is km2. There are 0.00404685642 square kilometers in an acre. A square kilometer is calculated as the area of a square that has 1 kilometer on each side. The International spelling for this unit is square kilometre.
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 acres to km2 is:
km2 = acres x 0.00404685642
Conversion Example
Next, let's look at an example showing the work and calculations that are involved in converting from acres to square kilometers (ac to km2).
Acres to Square Kilometer Conversion Example
Task: Convert 5,000 acres to square kilometers (show work) Formula: acres x 0.00404685642 = km2 Calculations: 5,000 acres x 0.00404685642 = 20.2342821 km2 Result: 5,000 acres is equal to 20.2342821 km2
Conversion Table
For quick reference purposes, below is a conversion table that you can use to convert from acres to km2.
Acres to Square Kilometers Conversion Chart
| acres (ac) | square kilometers (km2) |
|---|---|
| 1 acres | 0.00404686 km2 |
| 2 acres | 0.00809371 km2 |
| 3 acres | 0.01214057 km2 |
| 4 acres | 0.01618743 km2 |
| 5 acres | 0.02023428 km2 |
| 6 acres | 0.02428114 km2 |
| 7 acres | 0.02832799 km2 |
| 8 acres | 0.03237485 km2 |
| 9 acres | 0.03642171 km2 |
| 10 acres | 0.04046856 km2 |
| 20 acres | 0.08093713 km2 |
| 30 acres | 0.12140569 km2 |
| 40 acres | 0.16187426 km2 |
| 50 acres | 0.20234282 km2 |
| 75 acres | 0.30351423 km2 |
| 100 acres | 0.40468564 km2 |
| 250 acres | 1.01171411 km2 |
| 500 acres | 2.02342821 km2 |
| 750 acres | 3.03514232 km2 |
| 1,000 acres | 4.04685642 km2 |
| 2,500 acres | 10.11714105 km2 |
| 5,000 acres | 20.2342821 km2 |
| 7,500 acres | 30.35142315 km2 |
| 10,000 acres | 40.4685642 km2 |
| 25,000 acres | 101.1714105 km2 |
| 50,000 acres | 202.342821 km2 |
| 75,000 acres | 303.5142315 km2 |
| 100,000 acres | 404.685642 km2 |
| 250,000 acres | 1,011.714105 km2 |
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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