Last updated: August 2026
Convert Acres to Square Feet
Converting between acres and square feet is essential for US real estate, land development, and farming. Use our free calculator to instantly get the exact land measurement conversion.
The Conversion Formula
The math is simple: Square Feet = Acres × 43,560. An acre is a unit of land area used in the imperial and US customary systems. It is traditionally defined as the area of one chain by one furlong (66 by 660 feet).
Worked Examples
- 1 acre = 1 × 43,560 = 43,560 sq ft
- 2 acres = 2 × 43,560 = 87,120 sq ft
- 0.5 acres (half acre) = 0.5 × 43,560 = 21,780 sq ft
- 0.25 acres (quarter acre) = 0.25 × 43,560 = 10,890 sq ft
To go the other direction, divide the square footage by 43,560. For example, a 15,000 sq ft lot is 15,000 ÷ 43,560 ≈ 0.344 acres.
Frequently Asked Questions
There are exactly 43,560 square feet in one acre.
To convert acres to square feet, multiply the area in acres by 43,560. For example, 2 acres equals 87,120 square feet.
One acre is about the size of a standard American football field without the end zones, or approximately 16 tennis courts.
An acre was historically defined as one chain by one furlong - 66 feet by 660 feet. Multiplying those gives 43,560 square feet, and that exact figure has stayed the legal definition ever since.
Divide the square footage by 43,560. For example, 21,780 square feet ÷ 43,560 = 0.5 acres.
A quarter acre (0.25 acres) equals 43,560 ÷ 4 = 10,890 square feet - a common residential lot size in many US suburbs.
Yes. Use the dropdown menus to convert between acres, square feet, square meters, square kilometers, and hectares in any direction.
The international acre (used in the US and most of the world today) is standardized at exactly 43,560 square feet. A separate, very slightly different 'US survey acre' exists for historical land surveying purposes, but the difference is negligible for everyday use.