Acre (ac)
International acre: 43 560 square international feet. The older US survey acre differs by about 2 parts per million.
What is an acre?
- Symbol
- ac
- Quantity
- Area
- Unit system
- US customary
- Definition
- International acre: 43 560 square international feet. The older US survey acre differs by about 2 parts per million.
- Exact
- Yes, the value is exact by definition
- Source
- International yard and pound agreement (1959)
Common applications
Used in the United States and the United Kingdom for land, farms and real estate.
Acre in other area units
- 1 ac = 4046856422.4 mm²Square millimeter
- 1 ac = 40468564.224 cm²Square centimeter
- 1 ac = 4046.8564224 m²Square meter
- 1 ac = 0.40468564224 haAcre to Hectare converter
- 1 ac = 0.0040468564224 km²Square kilometer
- 1 ac = 6272640 in²Square inch
- 1 ac = 43560 ft²Acre to Square foot converter
- 1 ac = 4840 yd²Square yard
- 1 ac = 0.0015625 mi²Square mile
Acre quick reference
| Acre | Hectare | Square foot | Square meter |
|---|---|---|---|
| 1 ac | = 0.40468564224 ha | = 43560 ft² | = 4046.8564224 m² |
| 10 ac | = 4.0468564224 ha | = 435600 ft² | = 40468.564224 m² |
| 100 ac | = 40.468564224 ha | = 4356000 ft² | = 404685.64224 m² |
| 1000 ac | = 404.68564224 ha | = 43560000 ft² | = 4046856.4224 m² |
Where the acre fits
The next smaller area unit is the square meter (m²). 1 ac = 4046.8564224 m², and 1 m² ≈ 0.0002471053815 ac.
The next larger area unit is the hectare (ha). 1 ac = 0.40468564224 ha, and 1 ha ≈ 2.471053815 ac.
Frequently asked questions
- How many hectares are in one acre?
- One acre = 0.40468564224 ha (hectares).
- How many square feet are in one acre?
- One acre = 43560 ft² (square feet).
- How many square meters are in one acre?
- One acre = 4046.8564224 m² (square meters).