Area of a Circle Calculator

Your details

Distance from the centre of the circle to its edge.
Distance from the centre of the circle to its edge.
Area
78.5398
Circumference31.4159
Radius5
Diameter10
Area (exact, in pi)25 pi m^2
Circumference (exact, in pi)10 pi m

A circle with radius 5 m has an area of 78.5398 m^2.

  • Area scales with the square of the radius, so doubling the radius quadruples the area.
  • Circumference grows linearly, always equalling pi times the diameter.
  • If you only measured the boundary and need the enclosed area, use the circumference-to-area reverse mode.

Next stepTry sector mode to find the area of a "pizza slice", or annulus mode for a ring-shaped region.

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