Calculate the Area of a Circle
This will calculate the area of a circle based on its diameter. Confused as to what diameter means? Scroll down for a diagram.
Diameter
cm
Diameter
ft
in
Diameter
meters
Diameter
yards
Units
Area of a 10′6″ diameter circle
| 86.590 | square feet |
| 12,469 | square inches |
| 9.6211 | square yards |
| 0.0019878 | acres |
| 8.0445 | square meters |
| 80,445 | square centimeters |
results may be rounded
Area of a Circle Formula
The area of a circle is pi times the square of its radius. The radius is half the diameter.
Area = π * (Diameter / 2)2
Diameter of a Circle
The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.