This rectangular calculator can help you calculate the area, perimeter, diagonal, length or width of a rectangle if you know the required dimensions.

## How does this rectangle calculator work?

Depending on the dimension to be determined, this rectangle calculator uses the formulas explained here:

■ In case you select to **solve for area (A)** you have to provide the length (l) and the width (w) then:

■ If you want to **calculate the perimeter (P)** you have to input the length (l) and the width (w):

■ In case you try to **compute the diagonal of the rectangle (d)** then you have to input the same two figures (its length and width) then:

■ If you want to **determine the length (l)**then you have to know the width (w) and the diagonal (d) of the rectangle:

■ In case you want to **estimate the width of the rectangle (w)** then you have to specify its length (l) and diagonal (d):