How to convert square feet to acres
One square foot equals 0.000023 acres, so multiply the number of square feet by 0.000023:
ac = ft² × 0.000023
ft² = ac ÷ 0.000023 (1 ac = 43,560 ft²)
Example: 10,000 ft² → 10,000 × 0.000023 = 0.229568 ac.
Going the other way, divide by 0.000023, or multiply by 43,560; the acres to square feet converter does it for you.
Everyday values
| Square feet | Acres | For example |
|---|---|---|
| 10,000 ft² | 0.229568 ac | a large house lot |
| 43,560 ft² | 1 ac | one acre |
| 87,120 ft² | 2 ac | two acres |
When you need this conversion
One acre is exactly 43,560 square feet. Lot sizes in US listings switch between square feet (smaller lots) and acres (larger ones).
Square foot to acre conversion table
| ft² | ac | ft² | ac |
|---|---|---|---|
| 5,000 ft² | 0.114784 ac | 55,000 ft² | 1.2626 ac |
| 10,000 ft² | 0.229568 ac | 60,000 ft² | 1.3774 ac |
| 15,000 ft² | 0.344353 ac | 65,000 ft² | 1.4922 ac |
| 20,000 ft² | 0.459137 ac | 70,000 ft² | 1.607 ac |
| 25,000 ft² | 0.573921 ac | 75,000 ft² | 1.7218 ac |
| 30,000 ft² | 0.688705 ac | 80,000 ft² | 1.8366 ac |
| 35,000 ft² | 0.803489 ac | 85,000 ft² | 1.9513 ac |
| 40,000 ft² | 0.918274 ac | 90,000 ft² | 2.0661 ac |
| 45,000 ft² | 1.0331 ac | 95,000 ft² | 2.1809 ac |
| 50,000 ft² | 1.1478 ac | 100,000 ft² | 2.2957 ac |
About the units
- Square foot (ft²): the area of a square 1 foot on each side, exactly 0.09290304 m².
- Acre (ac): 43,560 square feet, about 4,046.86 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 acres are in one square foot?
One square foot is 0.000023 acres. One acre is 43,560 square feet.
How do I convert square feet to acres?
Multiply the value in square feet by 0.000023. To go back, divide by 0.000023.
What is 10,000 ft² in acres?
10,000 ft² = 0.229568 ac.
What is 43,560 ft² in acres?
43,560 ft² = 1 ac.
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.