EVERYDAY
Area
Surface, land and cross-sectional area.
Try a decimal, 1e-9, 1/3, or 5 1/2.
Result0.00404686 km²1 acre = 0.00404686 km²
EVERYDAY · ENGINEERING · SCIENCE
acre to km² Converter
Convert acre (acre) to square kilometre (km²). Enter a value for an instant result, or use the examples and reverse conversion below.
520units ready to convert
HOW IT IS CALCULATED
Convert through square metre
Enter a acre value to calculate square kilometre with full internal precision before display rounding.
Display PrecisionAuto · 6 significant digits
Auto trims unnecessary zeroes and uses scientific notation for extreme magnitudes. Use Digits to set the display precision; calculations retain full precision.
QUICK REFERENCE
All units in this quantity
| Unit | Symbol | Converted value |
|---|---|---|
| square micrometrefrom acre | µm² | 4.04686e15 |
| square millimetrefrom acre | mm² | 4046860000 |
| square centimetrefrom acre | cm² | 40468600 |
| square decimetrefrom acre | dm² | 404686 |
| square metrefrom acre | m² | 4046.86 |
| arefrom acre | a | 40.4686 |
| hectarefrom acre | ha | 0.404686 |
| square kilometrefrom acre | km² | 0.00404686 |
| square inchfrom acre | in² | 6272640 |
| square footfrom acre | ft² | 43560 |
| square yardfrom acre | yd² | 4840 |
| acrefrom acre | acre | 1 |
| square milefrom acre | mi² | 0.0015625 |
| barnfrom acre | b | 4.04686e31 |
SI symbols follow international notation. U.S. and Imperial measures are labelled separately where their values differ.
acre to km² Conversion Reference
Acre (acre) and square kilometre (km²) are units of area. Use this page to convert in either direction.
Conversion Examples
| Acre (acre) | Square Kilometre (km²) |
|---|---|
| 1 acre | 0.00404686 km² |
| 5 acre | 0.0202343 km² |
| 10 acre | 0.0404686 km² |
| 100 acre | 0.404686 km² |
Examples are rounded to 6 significant digits. The interactive converter retains full calculation precision; change Display Precision to see more digits.
Reverse Conversion
km² to acre (square kilometre to acre)
Related Area Conversions
acre to µm² (acre to square micrometre)acre to mm² (acre to square millimetre)acre to cm² (acre to square centimetre)acre to dm² (acre to square decimetre)acre to m² (acre to square metre)acre to a (acre to are)acre to ha (acre to hectare)acre to in² (acre to square inch)acre to ft² (acre to square foot)acre to yd² (acre to square yard)acre to mi² (acre to square mile)acre to b (acre to barn)