Circle Calculator

Calculate the area, circumference, and diameter of a circle.

geometry

math

circle

area

circumference

círculo

cercle

cerchio

круг

دائرة

圆

वृत्त

círculo

円計算機

Circle Calculator

Calculate diameter, circumference, and area of a circle from its radius.

Radius

Formula & Explanation

Quickly calculate the area, circumference, and diameter of any circle. Ideal for students, engineers, and mathematicians.