Land area calculator
Acre to Sq Ft Calculator
Enter acres or square feet to convert land area in either direction using the exact U.S. relationship.
How to convert acres to square feet
An acre is an area unit equal to 43,560 square feet. Multiply acres by 43,560; divide square feet by the same number for the reverse conversion.
square feet = acres × 43,560
acres = square feet ÷ 43,560
1 acre = 43,560 square feet exactly
Example: 0.5 acre × 43,560 = 21,780 sq ft.
Where acre-to-square-foot conversion is useful
Property listings may summarize land in acres while site plans, buildings, and local comparisons use square feet.
Lot-size comparison
Compare a listing measured in acres with another property or requirement stated in square feet.
Planning and landscaping
Translate a total parcel area before estimating coverage, planting, or materials.
Real-estate research
Normalize land-area figures while remembering that area alone does not reveal lot shape or usable space.
Common acres to square feet chart
Square-foot values come directly from 43,560 square feet per acre.
| Acres (ac) | Square feet (sq ft) |
|---|---|
| 0.01 | 435.60 |
| 0.1 | 4356.00 |
| 0.25 | 10890.00 |
| 0.5 | 21780.00 |
| 0.75 | 32670.00 |
| 1 | 43560.00 |
| 2 | 87120.00 |
| 3 | 130680.00 |
| 5 | 217800.00 |
| 10 | 435600.00 |
| 20 | 871200.00 |
| 40 | 1742400.00 |
| 100 | 4356000.00 |
Area, dimensions, and rounding
Acres and square feet measure area. A converted area cannot tell you the parcel's width, length, shape, slope, setbacks, or usable portion.
The conversion factor is exact, but a property listing may already be rounded or estimated. Displaying more decimal places does not make the source measurement more precise.
Use a survey, deed, assessor record, or qualified local professional for legal boundaries and transaction decisions.
Sources and method
The unit constants come from the primary standards below. ToolNeko applies those constants in a browser-only calculation, then rounds only the displayed result.
- NIST Handbook 133 — Appendix E Lists the U.S. customary area relationship of one acre to 43,560 square feet.
- NIST Guide to the SI, Appendix B — Conversion Factors Provides the NIST reference framework for converting customary quantities to SI and related units.
Frequently asked questions
How many square feet are in one acre?
One acre contains exactly 43,560 square feet.
How many square feet are in half an acre?
Half an acre is 21,780 square feet.
How do I convert square feet to acres?
Divide square feet by 43,560. For example, 87,120 sq ft ÷ 43,560 = 2 acres.
Does acreage tell me a property's dimensions?
No. It tells you total area only. Different lot shapes can have the same acreage.