What is Acres to Square Feet Converter?
acres to square feet, 43560 sq ft This tool runs entirely in your browser. No data is sent to any server, and no signup is needed.
Acres to Square Feet Converter
acres to ft2 converter
Multiply by 43560 to convert acres to ft2.
How is this calculated?
1 acres = 43560 ft2. Conversion factor sourced from NIST SP 811 (Guide for the Use of the International System of Units).
Convert between acres and square feet. 1 acre = 43,560 square feet by US definition.
Quick reference: acres to square feet
| acres | square feet |
|---|---|
| 1 acres | 43,560 square feet |
| 10 acres | 435,600 square feet |
| 100 acres | 4.356e+06 square feet |
| 1,000 acres | 4.356e+07 square feet |
| 10,000 acres | 4.356e+08 square feet |
About acres and square feet
An acre is a unit of area used for land in the US, UK, Canada, and most of the Commonwealth. By statutory definition, 1 acre equals exactly 43,560 square feet. The unit dates back to medieval England and was set as the area one ox-team could plough in a day, a chain (66 ft) wide and a furlong (660 ft) long.
How it works
The conversion is a single multiplication. There is nothing approximate about it within either the international or US survey system.
Square feet = Acres x 43,560 (exact) Acres = Square feet / 43,560 International acre = 4,046.8564224 m^2 (1959 yard-pound agreement) US survey acre = 4,046.872609874 m^2 (uses US survey foot, retired in 2023 for new work)
- 43,560 sq ft: the canonical conversion. 1 chain x 1 furlong = 66 ft x 660 ft = 43,560 sq ft.
- 1 square mile: 640 acres = 27,878,400 sq ft.
- 1 hectare: 2.4710538 acres = 107,639.1 sq ft.
- 1 township (Public Land Survey System): 36 sections = 36 sq mi = 23,040 acres.
Worked example
You are buying a rural parcel listed as 7.25 acres. How big is that in square feet, and how does it compare to a typical suburban lot?
- Acres: 7.25.
- Multiply by 43,560: 7.25 x 43,560.
- Step it out: 7 x 43,560 = 304,920. Then 0.25 x 43,560 = 10,890.
- Sum: 304,920 + 10,890 = 315,810 sq ft.
- Median suburban lot in 2024: 8,275 sq ft (US Census).
- Comparison: 315,810 / 8,275 = 38.2 suburban lots fit in this parcel.
- In acres of context: a US football field is 1.32 acres including end zones; 7.25 acres fits 5.5 football fields.
Acre to square feet reference table
| Acres | Square feet | Square meters | Hectares |
|---|---|---|---|
| 0.10 | 4,356 | 404.69 | 0.040 |
| 0.25 | 10,890 | 1,011.71 | 0.101 |
| 0.50 | 21,780 | 2,023.43 | 0.202 |
| 1.00 | 43,560 | 4,046.86 | 0.405 |
| 2.50 | 108,900 | 10,117.14 | 1.012 |
| 5.00 | 217,800 | 20,234.28 | 2.023 |
| 10.00 | 435,600 | 40,468.56 | 4.047 |
| 40.00 (a quarter-quarter section) | 1,742,400 | 161,874.26 | 16.187 |
| 640 (1 sq mi, 1 section) | 27,878,400 | 2,589,988 | 258.999 |
Common mistakes
- Confusing acres with hectares. 1 hectare = 2.471 acres = 107,639 sq ft. A 10 hectare parcel is 24.7 acres, not 10.
- Treating the US survey acre as different in practice. The 16 cm^2 difference between international and US survey acres only matters in Public Land Survey System work. For real estate, use 43,560 sq ft.
- Multiplying acres by 4,840 (square yards). 1 acre is 4,840 sq yards or 43,560 sq ft. Mixing units between yards and feet is the most common manual error.
- Forgetting the difference between net and gross acreage. Subdivision listings often quote gross acres including roads and easements; usable (net) acreage can be 70 to 90 percent of gross.
- Using imperial values in metric jurisdictions. Canada, Australia, and the UK have largely switched to hectares for survey. Acres still appear on rural listings but land transfer forms now use metric.
- Confusing area with frontage. A 1 acre parcel can be 100 ft x 436 ft (deep and narrow) or 200 ft x 218 ft (square). Always ask for dimensions plus area.
Related tools and glossary
Frequently asked questions
How many square feet are in an acre?
Exactly 43,560 square feet. The acre was originally defined as a chain (66 ft) by a furlong (660 ft), giving 66 x 660 = 43,560 sq ft. The number has been fixed by statute in the US since the 19th century.
How big is a typical US house lot?
Median US suburban lot in 2024 was about 0.19 acre, or 8,275 sq ft, per US Census new-home data. Urban lots run 5,000 to 7,500 sq ft. Rural and ranch lots commonly start at 1 acre and go up. Florida's median lot has shrunk to 7,500 sq ft, while Montana exceeds 17,000.
How many acres is one square mile?
640 acres. A standard US township under the Public Land Survey System is 6 miles by 6 miles = 36 square miles = 23,040 acres = 1,003,622,400 sq ft. Each township subdivides into 36 sections of 640 acres each.
Are US and international acres the same?
Almost identical. The international acre is 4,046.8564224 m^2 (definition from the 1959 international yard and pound agreement). The US survey acre is 4,046.872609874 m^2 because it uses the older US survey foot. The difference is about 16 cm^2, or 0.0004 percent, irrelevant outside Public Land Survey System work.
Sources
- NIST SP 811 (2008) Guide for the Use of the International System of Units (SI), Appendix B.
- National Geodetic Survey (2023) US Survey Foot Deprecation Notice.
- US Census Bureau (2024) Survey of Construction: Lot Size of New Single-Family Homes.
- USDA NASS (2025) Land Values Summary, cropland and pastureland average per acre.