One acre is exactly 4,046.8564224 square meters, or about 4,047 m². Multiply acres by that number to get square meters. People convert in this direction when an acreage needs to fit a metric system: an engineer putting a US site into metric drawings, a researcher combining field data from several countries, or a family reading an old title in a country that has since gone metric.
Formula
Acres to Square Meters conversion table
| Acres | Square Meters |
|---|---|
| 1 ac | 4,046.86 m² |
| 2 ac | 8,093.71 m² |
| 3 ac | 12,140.57 m² |
| 4 ac | 16,187.43 m² |
| 5 ac | 20,234.28 m² |
| 6 ac | 24,281.14 m² |
| 7 ac | 28,327.99 m² |
| 8 ac | 32,374.85 m² |
| 9 ac | 36,421.71 m² |
| 10 ac | 40,468.56 m² |
| 12 ac | 48,562.28 m² |
| 15 ac | 60,702.85 m² |
| 20 ac | 80,937.13 m² |
| 25 ac | 101,171.41 m² |
| 30 ac | 121,405.69 m² |
| 40 ac | 161,874.26 m² |
| 50 ac | 202,342.82 m² |
| 60 ac | 242,811.39 m² |
| 70 ac | 283,279.95 m² |
| 75 ac | 303,514.23 m² |
| 80 ac | 323,748.51 m² |
| 90 ac | 364,217.08 m² |
| 100 ac | 404,685.64 m² |
Where you’ll use it
Australia, New Zealand and Ireland all used acres on older land titles before switching to metric units, so inherited deeds and family records there can still quote acres, sometimes with roods and perches as well. Development plans and planning applications in those countries are now in square meters. In the US, metric site plans for international clients or federal projects meet the same problem from the other side. A half acre is about 2,023 m² and a quarter acre about 1,012 m².
Tip: Historic documents sometimes use an Irish or Scottish acre, both larger than the statute acre used here. If an old deed predates metric conversion and the figure seems off, check which acre it meant before converting.