✓ Effortless Math · Free Tool

Circle Equation Calculator

Convert the general form x² + y² + Dx + Ey + F = 0 into center-radius form — get the center, radius, circumference, area, and a graph.

x² + y² + Dx + Ey + F = 0 → center & radius
x² + y² + Dx + Ey + F = 0

Enter D, E, F from the general form x² + y² + Dx + Ey + F = 0. The tool completes the square to find the center and radius.

Results

Center & radius
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Center
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Radius
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Diameter
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Circumference
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Area
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Standard form
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Diagram

CircleCenter

Step-by-step