Area, Perimeter and Diagonal of a Rectangle - Calculator

An easy to use online calculator to calculate the area, perimeter and diagonal of a area A and perimeter P of a rectangle given its dimensions (length and width).

The formulas for the perimeter P, area A and length D of the diagonal of a rectangle of length L and width W are given by:

P = 2 L + 2 W

A = L W

D = √( L 2 + W 2 )

How to use the calculator

Enter the length L and width W as positive real numbers and press "calculate". The outputs are the area A, perimeter P and diagonal D of the rectangle.

L =
W =

A =
P =
D =

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Updated: February 2015

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