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 width x and y are given by:

How to use the calculator

Enter the length and width as positive real numbers and press "enter". The outputs are the area, perimeter and diagonal of the rectangle whose dimensions are input.

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