Acre to Square Foot Converter
Converts acre to square foot (ac to sq ft) and back. The conversion factor is shown below every result.
How to Convert Acre to Square Foot
What Is an Acre?
The acre (ac) is a US customary and imperial unit of land area, defined as exactly 43,560 square feet.
What Is a Square Foot?
The square foot (sq ft) is a US customary and imperial unit of area equal to the area of a square with 1-foot sides.
Common Acre to Square Foot Reference Points
Real-world reference values for quick sanity checks.
| Item | Acre (ac) | Square Foot (approx.) |
|---|---|---|
| A US football field with end zones (approx.) | 1.32 ac | 57,499 sq ft |
| A typical suburban house lot (approx.) | 0.25 ac | 10,890 sq ft |
| Reference values are illustrative approximations for common items, not measured specifications. | ||
Acre to Square Foot Conversion Table
| Acre (ac) | Square Foot (sq ft) |
|---|---|
| 0.1 ac | 4356 sq ft |
| 0.25 ac | 10890 sq ft |
| 0.5 ac | 21780 sq ft |
| 0.75 ac | 32670 sq ft |
| 1 ac | 43560 sq ft |
| 2 ac | 87120 sq ft |
| 5 ac | 217800 sq ft |
| 10 ac | 435600 sq ft |
| 50 ac | 2178000 sq ft |
| Source: NIST SP 811, Appendix B (1 acre = 43,560 sq ft exactly) | |
Frequently Asked Questions
How do I convert acres to square feet?
Multiply the acre value by 43,560. For example, 0.5 ac × 43,560 = 21,780 sq ft.
Why is 43,560 the conversion number?
The acre is defined as exactly 43,560 square feet. It's a fixed definition rather than a rounded estimate, dating back to old English land-measurement practice and carried into US customary units.
Is an acre the same size everywhere?
The acre used in the US and most English-speaking countries today (the international acre, based on 43,560 international-foot square feet) is standard. A separate US survey acre exists for historical land records and differs by about 2 parts per million, which is irrelevant for everyday use.
Related Area Converters
A good measuring tool marked in both ac and sq ft removes the guesswork at the point of use.