Convert square feet to acres


To convert square feet to acres, first you need to know how many square feet there are in an acre.

By definition 1 acre is equal to 43560 square feet.



This relationship between square feet and acres can help you convert any area that is in square feet to acres.

Example #1

Convert 87120 square feet to acres.

We can solve this problem by setting up a proportion.

If 43560  square feet is equal 1 acre

87120 square feet is equal to x acres

Here is table that summarizes this problem.

43560 1 acre
87120 x


The proportion is 43560 / 87120 = 1 acre / x

After cross multiplication, we get 43560 × x = 87120 × 1 acre

43560x = 87120 acres

x = 87120 acres / 43560

x = 2 acres

87120 square feet is equal to 2 acres.

Example #2

Convert 21780 square feet to acres.

Again, this problem can be solved by setting up a proportion.

If 43560  square feet is equal 1 acre

21780 square feet is equal to x acres

Here is table that summarizes this problem.

43560 1 acre
21780 x


The proportion is 43560 / 21780 = 1 acre / x

After cross multiplication, we get 43560 × x = 21780 × 1 acre

43560x = 21780 acres

x = 21780 acres / 43560

x = 0.5 acres

21780 square feet is equal to 0.5 acres.





Recent Articles

  1. Overtime Calculator - How much for Time and a Half or Double rate ?

    Jan 18, 19 10:53 AM

    This overtime calculator will help you figure out how much money earned for working overtime

    Read More

New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.

            Follow me on Pinterest





Recent Lessons

  1. Overtime Calculator - How much for Time and a Half or Double rate ?

    Jan 18, 19 10:53 AM

    This overtime calculator will help you figure out how much money earned for working overtime

    Read More

  Our Top Pages

Formula for percentage

Compatible numbers

Basic math test

Basic math formulas

Types of angles

Math problem solver

Algebra word problems

Surface area of a cube

Finding the average 

Scale drawings

Tough Algebra Word Problems.

If you can solve these problems with no help, you must be a genius!


Everything you need to prepare for an important exam!

K-12 tests, GED math test, basic math tests, geometry tests, algebra tests. 


Real Life Math Skills

Learn about investing money, budgeting your money, paying taxes, mortgage loans, and even the math involved in playing baseball.

 Recommended

Scientific Notation Quiz

Types of Angles Quiz

Graphing Slope Quiz

Adding and Subtracting Matrices Quiz  

Factoring Trinomials Quiz 

Solving Absolute Value Equations Quiz  

Order of Operations Quiz