Starlight Tools

Acres to Square Feet Calculator

Convert acres to square feet for land, lots, yards, farms, and planning estimates. Everything runs locally in your browser.

Enter acreage

Use decimal acres, such as 0.25 for a quarter acre or 2.5 for two and a half acres.

Must be zero or greater.

0.25 acre10,890 ft²
0.5 acre21,780 ft²
1 acre43,560 ft²
5 acres217,800 ft²

Results

Square feet
43,560 ft²
1 acre equals 43,560 square feet.
Square yards4,840 yd²
Square meters4,046.86 m²
Hectares0.4047 ha
Square miles0.0016 mi²

Acres to square feet formula

The standard conversion is 1 acre = 43,560 square feet. This tool uses:

  • Square feet: acres x 43,560
  • Square yards: square feet / 9
  • Square meters: square feet x 0.09290304
  • Hectares: acres x 0.40468564224

Assumption: the acre value is a flat land-area measure. This is a unit conversion tool, not a survey, zoning, title, or legal boundary calculator.

Use the converted square-foot value as a starting point when comparing parcels, estimating broad coverage, or translating property descriptions into the units used by a supplier. If the original acre figure is rounded, the square-foot result is rounded in the same practical sense even though the conversion factor is exact. For purchase, permitting, fencing, drainage, or boundary decisions, rely on a survey, plat, deed, or local professional rather than a unit conversion alone.

How to use the result

  1. Enter the land area in acres. Decimal values are supported.
  2. Choose a display precision that matches your source measurement.
  3. Use the square-foot result for coverage, rough planning, or comparison with property listings.
  4. For material estimates, combine this result with measured shape details and waste factors in a project-specific calculator.

Acres to square feet FAQs

Is 1 acre exactly 43,560 square feet?

Yes. The acre used here is the international acre, which is exactly 43,560 square feet.

How many square feet are in a half acre?

A half acre is 21,780 square feet because 0.5 x 43,560 = 21,780.

How many square feet are in a quarter acre?

A quarter acre is 10,890 square feet because 0.25 x 43,560 = 10,890.

Why might a property's usable area be smaller than the acre conversion?

Setbacks, easements, slopes, wetlands, roads, buildings, and local rules can reduce usable area. This calculator only converts units.

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