Semicircle Calculator

Calculations of the semicircle. A semicircle is a segment of a circle whose chord is the diameter of this circle, and the arc of the circle lying between the ends of the diameter, the circle is divided in half through its center. Enter one value, then click the Calculate button.


Semicircle Calculator

Radius (r)
Diameter (d)
Arc length (a)
Perimeter (P)
Square (S)


d = 2 r
a = π r
p = π r + 2 r
S = π r2 / 2


Arc length
S is the area, P is the perimeter