OneFreePlace
FREE ONLINE TOOL

Free Circle
Calculator

Calculate circle radius, diameter, circumference and area; solve sectors, arcs, chords, segments, annuli, circle equations and circles through three points. Free and private.

Open this tool in its own window ↗

FreeUse this tool without paying.No sign upStart with the tool right away.Clear stepsRead the tool’s own guidance.

About Free Circle Calculator

Solve basic circle dimensions, sectors and arcs, chords and segments, annuli, coordinate equations, or the unique circle through three non-collinear points.

Workspace options

  • Decimals
  • Unit

Available actions

  • Basic circle
  • Sector / arc
  • Chord / segment
  • Annulus
  • Circle equation
  • 3 points → circle