How to calculate acreage
Multiply length by width in feet to get square feet, then divide by 43,560. A lot 208.7 ft × 208.7 ft is almost exactly one acre. For land measured in metres, divide square metres by 4,046.86 to get acres, or by 10,000 to get hectares. Irregular parcels can be split into rectangles and triangles and added together.
Common lot sizes
- ¼ acre = 10,890 sq ft (about 104 × 104 ft)
- ½ acre = 21,780 sq ft
- 1 acre = 43,560 sq ft ≈ 4,047 m² ≈ 0.405 ha
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Area calculators
Frequently asked questions
How big is an acre in feet?
An acre is 43,560 square feet — for example 208.7 × 208.7 ft, or 66 × 660 ft.
How many acres is a hectare?
One hectare is 2.471 acres.