Use these circle calculators below and choose calculations you need. You can find there formulas, sketch and practical use of calculations.

Circle defintion

A circle is a set of points in a plane whose distance from a fixed point (the centre of a circle) is less than or equal to a fixed positive number (called a radius).

Circle calculations

Use calculators to make circle calculations of radius, diameter, circumference (perimeter), area (circular area), chord, arc, circle segment and circle sector.