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Rectangle Calculator


About Rectangle Calculator

The Rectangle Calculator is used to calculate the area, perimeter and diagonal of a rectangle.


In geometry, a rectangle is any quadrilateral with all four interior angles 90° (right angles).


The following is the calculation formulas of the area, perimeter and diagonal of rectangle whose sides have width a and length b:

The perimeter of a rectangle

P = 2(a + b)

The area of a rectangle

A = ab

The diagonal of a rectangle

D = √a2 + b2

a, b = the width and length of a rectangle
P = the perimeter of a rectangle
A = the area of a rectangle
D = the diagonal of a rectangle


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