Circle Measurements Calculator

Your details

Choose which measurement you already know. All others are calculated from it.
Unit for radius, diameter, circumference, arc and chord outputs.
Enter the measurement you know. The unit displayed above applies to linear inputs; area inputs are in that unit squared.
The angle at the centre of the circle in degrees. Used to compute arc length, sector area, and chord length.
deg
How many decimal places to show in outputs.
Radius
5

Distance from the centre to any point on the circle

Diameter10
Circumference31.4159
Area78.5398
Arc length7.854
Sector area19.635
Chord length7.0711
Segment area7.135
Unitcm

Circle with radius 5.0000 cm.

  • The diameter is exactly twice the radius: 10.0000 cm.
  • The circumference is 31.4159 cm (about 3.14159 times the diameter, which is always pi).
  • The area 78.5398 cm² equals pi times the radius squared.
  • At 90 degrees, the arc length is 7.8540 cm (25.0% of the full circumference).
  • The chord connecting the two arc endpoints is 7.0711 cm long.

Next stepChange the central angle above to explore how arc length, sector area, and chord length vary around the circle.

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