This converter switches between square feet and acres in both directions — the standard tool for sizing building plots, paddocks, and land parcels measured in US/imperial units. Type into either box and the other fills in instantly.
How it works
The whole conversion rests on one exact definition: 1 acre = 43,560 square feet.
- Square feet to acres: acres = ft² ÷ 43,560
- Acres to square feet: ft² = acres × 43,560
The figure 43,560 comes from an acre’s historic definition of one chain (66 ft) by one furlong (660 ft), since 66 × 660 = 43,560.
Example
A 10,000 ft² lot:
10,000 ÷ 43,560 ≈ 0.2296 acres — just under a quarter-acre.
Going the other way, 2 acres is 2 × 43,560 = 87,120 ft².
| Square Feet | Acres |
|---|---|
| 10,890 ft² | 0.25 ac (quarter-acre) |
| 21,780 ft² | 0.5 ac (half-acre) |
| 43,560 ft² | 1.0 ac |
| 100,000 ft² | 2.2957 ac |
The conversion runs entirely in your browser, with no uploads and no tracking.