When you need this conversion
Comparing residential lots, reading property tax records, planning lawns, pastures and solar installations, or zoning rules that set minimum lot sizes in acres.
Quick reference
- 5,000 ft² = 0.114784 ac
- 10,000 ft² = 0.229568 ac
- 10,890 ft² = 0.25 ac
- 21,780 ft² = 0.5 ac
- 43,560 ft² = 1 ac
- 100,000 ft² = 2.29568 ac
Lot sizes
A typical suburban US lot is 7,000–10,000 ft², or 0.16–0.23 acres. A lot listed as “0.25 ac” is 10,890 ft², which is about 104 × 104 ft if square.
Common mistakes
Assuming 40,000 ft² per acre. It’s 43,560. The round number underestimates by 8%.
Forgetting the house is included. Lot size is the whole parcel, not the yard.
For metric land units, use acres to hectares. For floor space, use square feet to square meters.