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Circle Area Calculator

Use a radius to calculate the circle area, circumference, and diameter.

01 / INPUTS

units

02 / RESULT

AREA

12.56637061 square units

Area
12.56637061 square units
Circumference
12.56637061 units
Diameter
4 units

Calculation trace

  1. π × 2 × 2 = 12.566371
    12.56637061 square units
    Area
  2. 2 × π × 2 = 12.566371
    12.56637061 units
    Circumference
  3. 2 × 2 = 4
    4 units
    Diameter
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