Square Foot to Acre (US Survey) Converter
Unit Converter
Instant · Precise · Universal
23 units available
6 categories total
How to Convert Square Foot to Acre (US Survey)
To convert ft² to m²: multiply by 0.0929. To acres: divide by 43,560.
1 ft² = 144 in² = 0.0929 m² ≈ 929 cm². 9 ft² = 1 yd². 43,560 ft² = 1 acre.
For example, 1 Square Foot (ft²) = 0.00002295674931 Acre (US Survey) (ac (US)).
Square Foot to Acre (US Survey) — Common Values
| Square Foot (ft²) | Acre (US Survey) (ac (US)) |
|---|---|
| 0.1 | 0.000002295674931 |
| 0.5 | 0.00001147837466 |
| 1 | 0.00002295674931 |
| 2 | 0.00004591349862 |
| 5 | 0.0001147837466 |
| 10 | 0.0002295674931 |
| 25 | 0.0005739187328 |
| 50 | 0.001147837466 |
| 100 | 0.002295674931 |
| 500 | 0.01147837466 |
| 1000 | 0.02295674931 |
About Square Foot (ft²)
Definition
The square foot is an imperial unit of area equal to the area of a square with sides of exactly one foot (0.0929 m²).
Mathematical Relationship
1 ft² = 144 in² = 0.0929 m² ≈ 929 cm². 9 ft² = 1 yd². 43,560 ft² = 1 acre.
Conversion Formula
To convert ft² to m²: multiply by 0.0929. To acres: divide by 43,560.
Practical Applications
Home and apartment sizes, office space, flooring calculations, carpet area, and construction specifications.
Interesting Facts
The average new US home is about 2,300 ft² (214 m²). The White House has about 55,000 ft² of floor space.
Common Mistakes
Incorrectly converting: 1 m ≈ 3.28 ft, but 1 m² ≈ 10.76 ft² (not 3.28). You must square the factor.
Educational Tips
A 12" × 12" floor tile = exactly 1 ft². Counting tiles gives you the room's area in square feet directly.
About Acre (US Survey) (ac (US))
Definition
The US survey acre is a historical unit of area based on the US survey foot, equal to approximately 4,046.873 m².
Mathematical Relationship
1 US survey acre ≈ 4,046.873 m². Differs from international acre (4,046.856 m²) by about 0.016 m².
Conversion Formula
To convert US survey acres to m²: multiply by 4,046.873. To international acres: multiply by ~1.000004.
Practical Applications
Historical US land surveys, old property deeds, and State Plane Coordinate System calculations.
Interesting Facts
The difference between US survey and international acre is about 0.016 m² — roughly the area of a sheet of paper. Over large areas, it adds up.
Common Mistakes
Using US survey acre in new calculations — it's been deprecated since 2023. Use the international acre instead.
Educational Tips
As of 2023, the US survey foot and acre are retired. All US measurements now use the international definitions.