Square Feet to Acres Converter

Use this converter to easily convert between Square Feet and Acres (sq ft to ac).

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How many Square Feet in an Acre?

There are 43,560 square feet in an acre, since an acre is originally defined as the area of a rectangle with sides of 66 and 660 feet (66 x 660 = 43560). The modern definition of the acre is established in 1959 by an international treaty, according to which the symbol for acre is "ac" and the symbol for square feet is "ft2", often written as "sq ft".

Difference between Square Feet and Acres

Both square feet and acres are units of area, though square feet are more commonly used to measure the area of a building or room, while acres are more commonly used for tracts of land. Both units are part of the Imperial system of units and have a long history.

Historically, the foot varied in length depending on which time period and location you are interested in. It is currently officially used only in the US, UK, and a couple of other countries and its definition is fixed to that of the meter.

The acre of old times equaled the area of land that could be ploughed in a day by a yoke of oxen. Relative to other traditional measures, the acre was defined as one chain by one furlong (66 ft by 660 ft), which equals 10 square chains or ​1⁄640 of a square mile. In 1959 it was defined to be 4,046.8564224 square meters. The acre was used as an official land unit in the United Kingdom and almost all countries of the former British Empire but that is now the case only in the United States.

How to convert Square Feet to Acres

To convert sq ft to acre, divide the measurement in square feet by 43560 to get the area in acres. Using a calculator is helpful when greater accuracy is desired, or when the numbers involved are bigger. Our free online square feet to acres converter should be of assistance. It will also work offline, as long as the page is cached in your browser.

Sq ft to ac conversion example

Sample task: convert 60 sq ft to ac. Solution:

Formula:
sq ft / 43560 = ac
Calculation:
1200 sq ft / 43,560 = 0.027548 ac
End result:
1200 sq ft is equal to 0.027548 ac

sq ft to ac conversion table

sq ft to ac conversion table
sq ft ac
1 sq ft 0.000023 ac
2 sq ft 0.000046 ac
3 sq ft 0.000069 ac
4 sq ft 0.000092 ac
5 sq ft 0.000115 ac
6 sq ft 0.000138 ac
7 sq ft 0.000161 ac
8 sq ft 0.000184 ac
9 sq ft 0.000207 ac
10 sq ft 0.000230 ac
20 sq ft 0.000459 ac
30 sq ft 0.000689 ac
40 sq ft 0.000918 ac
50 sq ft 0.001148 ac
60 sq ft 0.001377 ac
70 sq ft 0.001607 ac
80 sq ft 0.001837 ac
90 sq ft 0.002066 ac
100 sq ft 0.002296 ac
200 sq ft 0.004591 ac
300 sq ft 0.006887 ac
400 sq ft 0.009183 ac
500 sq ft 0.011478 ac
600 sq ft 0.013774 ac
700 sq ft 0.016070 ac
800 sq ft 0.018365 ac
900 sq ft 0.020661 ac
1,000 sq ft 0.022957 ac

References:

[1] NIST Special Publication 330 (2008) - "The International System of Units (SI)", edited by Barry N.Taylor and Ambler Thompson

[2] International Organization for Standardization (1993). ISO Standards Handbook: Quantities and units (3rd edition). Geneva: ISO. ISBN 92-67-10185-4.

Cite this converter & page

If you'd like to cite this online converter resource and information as provided on the page, you can use the following citation:
Georgiev G.Z., "Square Feet to Acres Converter", [online] Available at: https://www.gigacalculator.com/converters/convert-square-feet-to-acres-sqft-ac.php URL [Accessed Date: 21 Jul, 2019].