Acre to Square kilometer Converter
Convert acres to square kilometers with this free area converter. The exact relationship used on this page is 1 acre = 0.0040468564224 square kilometers. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Square kilometer = Acre × 0.0040468564224
How to convert acres to square kilometers
- Enter the value in acres in the converter.
- Read the equivalent amount in square kilometers.
- Use the swap link if you need square kilometer to acre instead.
- Check the table for common values without typing.
Worked examples
- 1 ac = 0.004046856422 km²
- 5 ac = 0.02023428211 km²
- 10 ac = 0.04046856422 km²
- 25 ac = 0.1011714106 km²
Conversion table
Common acres values converted to square kilometers.
| ac | km² |
|---|---|
| 1 | 0.004046856422 |
| 2 | 0.008093712845 |
| 3 | 0.01214056927 |
| 4 | 0.01618742569 |
| 5 | 0.02023428211 |
| 6 | 0.02428113853 |
| 7 | 0.02832799496 |
| 8 | 0.03237485138 |
| 9 | 0.0364217078 |
| 10 | 0.04046856422 |
| 20 | 0.08093712845 |
| 50 | 0.2023428211 |
| 100 | 0.4046856422 |
| 250 | 1.011714106 |
| 500 | 2.023428211 |
| 1,000 | 4.046856422 |
About this conversion
Acre (ac) and Square kilometer (km²) are both area units. Area converters help with flooring, land, real estate listings, and fabric. Bookmark this URL when you convert acres to square kilometers often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the square kilometer to acre converter.
FAQ
How many square kilometers are in 1 acre?+
1 acre equals 0.0040468564224 square kilometers.
What is the formula to convert acres to square kilometers?+
Square kilometer = Acre × 0.0040468564224
How do I convert acres to square kilometers by hand?+
Multiply the acre value by 0.0040468564224. Example: 10 acres × 0.0040468564224 = 0.040468564224 square kilometers.
Is this ac to km² converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.