Use case · Updated August 7, 2026
How many acres is my lot?
Direct answer
Acres = square feet ÷ 43,560. A common 50 × 100 ft lot is 5,000 sq ft ≈ 0.115 acres. One full acre is exactly 43,560 sq ft (~208.7 ft square).
Citeable lot examples
| Lot | Square feet | Acres |
|---|---|---|
| 50 × 100 ft rectangle | 5,000 | 0.115 |
| 80 × 120 ft rectangle | 9,600 | 0.220 |
| Quarter acre (fixed) | 10,890 | 0.250 |
| Half acre (≈ square) | 21,780 | 0.500 |
| ~148 ft square ≈ ½ acre; ~209 ft square ≈ 1 acre | 43,560 | ~1.000 |
Honest limits: surveys beat tape measures for irregular lots, easements, and setbacks. Zoning minimums vary by city — acres alone do not approve building.
Formula
- Rectangle: sq ft = length × width
- Acres: sq ft ÷ 43,560
- Metric: 1 acre ≈ 4,046.86 m² (optional check)
Use the free calculator
Enter length/width or total area: Lot size to acres calculator. Related: capital gains on a home sale.