Area Calculator
Enter the side length to compute the area of a square. For other shapes, use the shape-specific tools.
Calculator
Use the Area Calculator
Result
—
Formula
A = side²
Step-by-step
- 1
Enter the side
Any positive length.
- 2
Read the area
Square units of the side length.
Worked example
Example input: a: 5
Result: 25
Related tools
- Square Perimeter
Distance around a square.
- Rectangle Area
Length × width.
- Circle Area
π × r².
Frequently asked questions
What if I know the diagonal instead of the side?
For a square, area = d² / 2. A diagonal of 10 diagonal units gives 50 square units, because the diagonal equals side x √2. Divide the squared diagonal by two and you have it. Room floors and tile boxes follow identical square logic: one side measurement decides all of the space covered.
Does doubling the side double the area?
It quadruples it: sides 2x longer in both directions cover 2 x 2 = 4 times the tiles. A 5-unit square covers 25 square units, a 10-unit square covers 100 — exactly four times.
Which tools handle other four-sided shapes?
For unequal sides of a rectangle shape, use the rectangle calculator; slanted corners belong to the parallelogram tool. This page covers the equal-sides square case only.