Quick Reference
1 acre = 43,560 sq ft
1 acre = 0.4047 hectares
1 hectare = 10,000 m² = 2.4711 acres
1 m² = 10.7639 sq ft
1 sq mi = 640 acres
Try It
Cross-Unit Reference Table
| Acres | Square Feet | Square Meters | Hectares |
|---|---|---|---|
| 0.1 acre | 4,356 sq ft | 404.7 m² | 0.0405 ha |
| 0.25 acre | 10,890 sq ft | 1011.7 m² | 0.1012 ha |
| 0.5 acre | 21,780 sq ft | 2023.4 m² | 0.2024 ha |
| 1 acre | 43,560 sq ft | 4047 m² | 0.4047 ha |
| 2 acres | 87,120 sq ft | 8094 m² | 0.8094 ha |
| 5 acres | 217,800 sq ft | 20234 m² | 2.0234 ha |
| 10 acres | 435,600 sq ft | 40,469 m² | 4.0469 ha |
| 100 acres | 4,356,000 sq ft | 404,686 m² | 40.469 ha |
Why These Units Exist
Acre
Defined in 13th-century English law as the area an ox-driven plow could turn in a single day — about one furlong (660 ft) long by one chain (66 ft) wide. The result, 43,560 sq ft, was codified and survives as the US standard land unit.
Hectare
Introduced with the French metric system in 1795. One hectare equals exactly 10,000 square meters, or a 100 × 100 m square. The hectare is the metric counterpart to the acre and the standard land measurement outside the US, UK, and Canada.
Square Foot
The square foot, in turn, derives from the international foot (exactly 0.3048 meters since 1959). That definition makes all square foot ↔ square meter conversions exact, not approximate.
Real-World Reference Points
- NFL football field (including end zones): 1.32 acres / 0.53 hectares
- Average US suburban lot: 0.2 acres / 8,712 sq ft
- Standard agricultural quarter-section: 160 acres / 64.7 hectares
- Walmart Supercenter typical lot: 17 acres / 740,000 sq ft
- Vatican City total area: 109 acres / 44.1 hectares
- Central Park, NYC: 843 acres / 341 hectares