`Area = pi * ( "d" /2)^2`

Enter a value for all fields

The Area of a Circle from the Diameter formula computes the area of a circle based on the circle's diameter.

INSTRUCTIONS:  Choose units and enter the following:

• (D) This is the diameter of the circle.

Circle Area (A):  The calculator returns the area in square meters.  However this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The formula for the area of a circle based on the diameter is:

           A = π•(D/2)²

where:

• A is the area of the circle
• D is the diameter of the circle