Acres to km² – convert acres to square kilometres
Convert acres to square kilometres (acres to km²) to express land areas and plots in modern metric mapping units. This page opens the main area converter with ac → km² pre-selected.
Open the interactive acres → km² converter:
Use main converter (acres → km²) or switch to km² → acresThe area converter also supports square metres, hectares, square feet, square yards and more for land and floor area calculations.
Quick reference: acres to km²
One acre is approximately 0.00404686 km², so: km² = acres × 0.0040468564224. Examples:
| Area (acres) | Area (km², approx.) |
|---|---|
| 10 acres | 0.0405 km² |
| 50 acres | 0.2023 km² |
| 100 acres | 0.4047 km² |
| 250 acres | 1.0117 km² |
| 500 acres | 2.0234 km² |
| 1,000 acres | 4.0469 km² |
Why convert acres to square kilometres?
Acres to km² is useful when you:
- Compare farms, forests or land parcels with regional or national statistics in km².
- Prepare GIS or mapping data that requires metric units.
- Translate real-estate or planning documents from imperial to metric.
- Report environmental impact over large areas in a standard metric unit.
Other area converters on this site
This converter uses the international acre (4,046.8564224 m²). All results are rounded for display; the underlying calculations keep higher precision.
Page last updated: 4 December 2025.