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Square Calculator

Side length:

About This Tool

The online Square Calculator is used to calculate the area, perimeter and diagonal of a square.


In geometry, a square is a regular quadrilateral which means that it has four equal sides and four equal angles.


The following is the calculation formulas of the area, perimeter and diagonal of square whose sides have length t:

The perimeter of a square

P = 4t

The area of a square

A = t2

The diagonal of a square

D = √2 t

t = the side length of a square
P = the perimeter of a square
A = the area of a square
D = the diagonal of a square

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