Circle Area & Circumference Calculator from Diameter

Would you like to know the area or the circumference of a circle and the only piece of information you have is the diameter of the circle? Use our Circle Area & Circumference Calculator from Diameter calculator that gives you the circumference and the area of a circle – the only thing you have to enter is the diameter of the circle.

Circle Area & Circumference Calculator from Diameter

The use of the calculator is easy: enter the diameter of the circle, then click on the Calculate button. The result appears immediately. If you want to run the calculation for another circle, enter the new diameter and click on the Calculate button again.
Click here to run the calculation and see the result.
(In the unit the diameter had been entered. If, for example, the diameter had been entered in centimetre, the calculated circumference is in centimetre, as well.)
(The square of the unit the diameter had been entered in. If, for example, the diameter had been entered in centimetre, the calculated area is in square centimetre.)

Formulas used for the calculation of a circle’s circumference and area from diameter:

  • The formula used for the calculation of circumference: C = d ∙ π
  • The formula used for the calculation of area: A = (d/2)2 ∙ π
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