Rectangle Calculator

Enter side length a and b

Enter side length and diagonal length


Rectangle - a geometrical figure, any four sided figure with only right angles. It consists of 2 pairs of parallel sides. The name comes from Latin rectangulus, that was created by combining rectus (meaning right) and angulus (meaning angle).

Equation form:

d = √(a² +b²)
Perimeter = 2 * a + 2 * b
Area enclosed (A) = a*b
Area(AC) of circumscribed circle about rectangle with side a,b:
AC =π * (a²+b²)

About Rectangle Calculator tool.

Remember this tool should be used only to calculate area, perimeter or volume of a figure. The results we provide are accurate, but rounded to the 12th decimal place. It accepts scientific notation and converts immediately.