Square Area Calculator
Find the area of a square from its side length — type a value and get the result instantly.
Formula
S = a²
where a is the side length of the square
About the Square Area Calculator
The area of a square measures how much flat space the shape covers. Because all four sides of a square are equal, you only need the length of one side to find the area.
To calculate the area of a square, you multiply the side length by itself. This quick calculation is handy for homework, home improvement, material layout, and design work.
Every calculation runs instantly and locally in your browser — nothing is uploaded, so your numbers stay completely private.
Benefits
Instant result
The area updates as you type the side length — no buttons to press.
Any units
Work in centimeters, meters, or inches — the result is always in square units.
Fully private
The calculation happens locally in your browser; your numbers never leave your device.
Frequently Asked Questions
How do you calculate the area of a square?
Multiply the side length by itself: S = a². For example, a square with a side of 5 cm has an area of 25 cm².
What is the formula for the area of a square?
The square area formula is S = a², where a is the side length. It is a special case of the rectangle area, where length equals width.
What units does the area come out in?
Area is measured in square units. If you entered the side in centimeters, the result is in square centimeters (cm²).
How do I find the side of a square from its area?
Take the square root of the area: a = √S. For example, if the area is 36 cm², the side is 6 cm.
What is the difference between area and perimeter of a square?
Area (S = a²) measures the space inside the shape, while perimeter (P = 4·a) is the total length around all four sides.