# Area of a 9 Foot Circle

What is the area of a circle with a DIAMETER of 9 feet (radius of 4.5 feet)? How big is a 9 foot circle?
Diameter
cm
Diameter
ft
in
Diameter
meters
Diameter
yards
Units
Area of a 9′ diameter circle
 63.617 square feet 9,160.9 square inches 7.0686 square yards 0.0014605 acres 5.9102 square meters 59,102 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.

Circle Area by Diameter
results may be rounded
Diameter ft2 in2 m2
9′0″ 63.62 9,161 5.910
9′1″ 64.80 9,331 6.020
9′2″ 66.00 9,503 6.131
9′3″ 67.20 9,677 6.243
9′4″ 68.42 9,852 6.356
9′5″ 69.64 10,030 6.470
9′6″ 70.88 10,210 6.585
9′7″ 72.13 10,390 6.701
9′8″ 73.39 10,570 6.818
9′9″ 74.66 10,750 6.936
9′10″ 75.94 10,940 7.055
9′11″ 77.24 11,120 7.175