Circle Length Calculator

Your details

Unit for all length inputs and outputs.
Choose what to calculate. The relevant inputs will be used.
The radius of the circle (half the diameter).
Whether the central angle is entered in degrees or radians.
The central angle subtended by the arc. Use 360 deg (or 2pi rad) for a full circle.
Arc length
15.708

Length of the arc defined by the central angle

Circumference62.8319
Radius10
Diameter20
Chord length14.1421
Sector area78.5398
Central angle90
Unitcm

Arc length: 15.7080 cm (full circumference: 62.8319 cm)

  • A central angle of 90.00 degrees defines a minor arc.
  • The arc is 25.0% of the full circumference (62.8319 cm).
  • The arc is 1.111x longer than its chord (the straight line across the arc's endpoints).
  • Remember that arc length scales linearly with radius: doubling the radius doubles the arc for the same angle.

Next stepTo find the sector area, see the "Sector area" output above, which gives the pie-slice region enclosed by the two radii and the arc.

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