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Square Feet to Acres Converter

Convert square feet to acres, or acres back to square feet, using the international acre of exactly 43,560 square feet.

What this tool does

Convert square feet to acres, or acres back to square feet, using the international acre of exactly 43,560 square feet. Type an amount in square feet, choose the units, and the tool converts it to acres (international). It converts between these two area units, in either direction.

Inputs

  • Value: A number.
  • From: Choose one: Square foot, Acre (international). Starts as Square foot.
  • To: Choose one of the same 2 units as "From". Starts as Acre (international).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount. It appears once every required field has a valid value.

Worked examples

Conversions from square feet to acres (international):

  • 1 ft² ≈ 0.0000229568 ac
  • 5 ft² ≈ 0.000114784 ac
  • 10 ft² ≈ 0.000229568 ac
  • 50 ft² ≈ 0.00114784 ac
  • 100 ft² ≈ 0.00229568 ac

Multiply the number of square feet by about 0.0000229568 to get acres (international). The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Square foot: exact by definition. Acre (international): exact by definition.

Limitations

  • Converts units of area only. It does not work out an area from lengths or measure a plot.
  • Square-unit conversions treat the area as a number: nothing about shape or location is considered.

FAQs

Q: How do I convert square feet to acres?
A: Divide by 43,560, because one acre is exactly 43,560 square feet.
Q: Which acre does this use?
A: The international acre, defined as 43,560 square international feet (4046.8564224 square meters). The US survey acre is larger by about four parts per million and is not offered here.

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