Square calculator

Square side length:



Free online square calculator – Calculate the area, perimeter, and diagonal of a square.

What is a square?

A square is a geometric shape that is a regular quadrilateral, meaning it has four equal sides and four equal angles. In a square:

  1. All four sides are of equal length.
  2. All four angles are right angles (90 degrees).
  3. The opposite sides are parallel.


  • Area of square = (side)² = a²
  • Diagonal of square = √2 x side = a√2
  • Perimeter of square = 4 x side = 4a meter

Solved Example

Example.:-Square side length = 20 cm, find the area, perimeter and diagonal of the Square.

Area of square = (side)² = (20)² = 400 cm²

Diagonal of square = √2 x side = √2 x 20 = 28.284 cm

Perimeter of square = 4 x side = 4 x 20 = 80 cm

How to use this square calculator 

Enter only the square side value in the proper input field and then click the calculate button

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