Acre to Square Kilometer Converter
Convert acres to square kilometers (acre to km²) instantly with this free online area converter. Enter any value in the Acre field and get the equivalent in Square Kilometer immediately. This converter handles any quantity — from tiny fractions to large numbers — with full precision. No signup, no ads in the widget, and the conversion runs entirely in your browser for instant results.
The conversion factor is exact: 1 acre = 0.00404686 km². To convert acres to square kilometers, multiply your Acre value by 0.00404686. For example, 10 acre = 0.0404686 km². You can also reverse the calculation: 1 km² = 247.105163 acre.
Quick conversion table
| Acre (acre) | Square Kilometer (km²) |
|---|---|
| 1 acre | 0.00404686 km² |
| 5 acre | 0.0202343 km² |
| 10 acre | 0.0404686 km² |
| 25 acre | 0.1011715 km² |
| 50 acre | 0.202343 km² |
| 100 acre | 0.404686 km² |
Use the swap button to reverse the direction, or choose a different unit from the dropdown menus to convert within the area category.
Formula
Acre to Square Kilometer conversion: 1 acre = 0.00404686 km² square kilometers = acres × 0.00404686 1 km² = 247.105163 acre acres = square kilometers × 247.105163
Example
Example: Convert 10 acre to km²: 10 acre × 0.00404686 = 0.0404686 km² So, 10 acre is about 0.0404686 km². To convert back, multiply by 247.105163: 0.0404686 km² × 247.105163 = 10 acre.
How to Use
- Enter the value you want to convert in the Acre field
- The result in Square Kilometer appears instantly below
- Use the dropdown menus to change units if needed
- Click 'Swap Units' to reverse the conversion direction
- Copy the result or adjust the input for a new conversion
Frequently Asked Questions
How do I convert acres to square kilometers?
Enter the value in Acre (acre) in the 'From' field. The equivalent in Square Kilometer (km²) appears instantly in the 'To' field. The converter uses precise conversion factors and updates in real time as you type.
What is the formula to convert acre to km²?
1 acre = 0.00404686 km², so square kilometers = acres × 0.00404686. To convert back, 1 km² = 247.105163 acre. The full formula and a worked example are shown on this page.
How many square kilometers are in one Acre?
1 acre = 0.00404686 km².
Is this Acre to Square Kilometer converter free?
Yes, completely free with no signup, no limits, and no ads in the converter widget. You can convert as many values as you need. The tool runs entirely in your browser, so your data never leaves your device.
Can I convert square kilometers back to acres?
Yes. Click the 'Swap Units' button to reverse the direction. You can also use the dropdown menus to select any other area unit for either field.
How accurate is the acre to km² conversion?
The converter uses high-precision conversion factors (up to 8 decimal places). Results are displayed with up to 6 decimal places, with trailing zeros removed for readability. For scientific or engineering work, always verify with official standards.