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).
P = 2 L + 2 W
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:
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.
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