How to convert acres to square feet
One acre equals 43,560 square feet, so multiply the number of acres by 43,560:
ft² = ac × 43,560
ac = ft² ÷ 43,560 (1 ft² = 0.000023 ac)
Example: 0.1 ac → 0.1 × 43,560 = 4,356 ft².
Going the other way, divide by 43,560, or multiply by 0.000023; the square feet to acres converter does it for you.
Everyday values
| Acres | Square feet | For example |
|---|---|---|
| 0.1 ac | 4,356 ft² | a small lot |
| 0.25 ac | 10,890 ft² | a quarter acre |
| 0.5 ac | 21,780 ft² | half an acre |
| 1 ac | 43,560 ft² | one acre |
When you need this conversion
Multiply acres by 43,560 to get square feet. A quarter-acre lot is 10,890 ft², a common size for suburban homes in the US.
Acre to square foot conversion table
| ac | ft² | ac | ft² |
|---|---|---|---|
| 0.1 ac | 4,356 ft² | 1.1 ac | 47,916 ft² |
| 0.2 ac | 8,712 ft² | 1.2 ac | 52,272 ft² |
| 0.3 ac | 13,068 ft² | 1.3 ac | 56,628 ft² |
| 0.4 ac | 17,424 ft² | 1.4 ac | 60,984 ft² |
| 0.5 ac | 21,780 ft² | 1.5 ac | 65,340 ft² |
| 0.6 ac | 26,136 ft² | 1.6 ac | 69,696 ft² |
| 0.7 ac | 30,492 ft² | 1.7 ac | 74,052 ft² |
| 0.8 ac | 34,848 ft² | 1.8 ac | 78,408 ft² |
| 0.9 ac | 39,204 ft² | 1.9 ac | 82,764 ft² |
| 1 ac | 43,560 ft² | 2 ac | 87,120 ft² |
About the units
- Acre (ac): 43,560 square feet, about 4,046.86 m².
- Square foot (ft²): the area of a square 1 foot on each side, exactly 0.09290304 m².
Both are units of area. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many square feet are in one acre?
One acre is 43,560 square feet. One square foot is 0.000023 acres.
How do I convert acres to square feet?
Multiply the value in acres by 43,560. To go back, divide by 43,560.
What is 0.1 ac in square feet?
0.1 ac = 4,356 ft².
What is 0.25 ac in square feet?
0.25 ac = 10,890 ft².
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.