Rectangle Area Calculator

Enter the height and width to instantly find a rectangle area, perimeter, and diagonal.

Input

Enter the height and width of a rectangle to calculate its area, perimeter, and diagonal length.

Height a

Width b

Area

Perimeter

Diagonal

11.661904

Lengths use the same unit as your input, and the area uses that unit squared.

The area is found with height a times width b. If the length unit is cm, the area is in square centimeters.
The perimeter is found with 2 times (height plus width).
The diagonal length comes from the Pythagorean theorem as the square root of (height squared plus width squared).
When the height and width are equal the shape becomes a square, and the same formula still gives the area.

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