Area of a 1 Foot Circle

What is the area of a circle with a DIAMETER of 1 feet (radius of 0.5 feet)? How big is a 1 foot circle?
ft
in
Area of a 1′ diameter circle
0.78540square feet
113.10square inches
0.087266square yards
0.072966square meters
729.66square 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.

Diameter
Circle Area by Diameter
(results are rounded)
Diameter ft2 in2 m2
1′0″ 0.7854 113.1 0.07297
1′1″ 0.9218 132.7 0.08563
1′2″ 1.069 153.9 0.09931
1′3″ 1.227 176.7 0.1140
1′4″ 1.396 201.1 0.1297
1′5″ 1.576 227.0 0.1464
Diameter ft2 in2 m2
1′6″ 1.767 254.5 0.1642
1′7″ 1.969 283.5 0.1829
1′8″ 2.182 314.2 0.2027
1′9″ 2.405 346.4 0.2235
1′10″ 2.640 380.1 0.2452
1′11″ 2.885 415.5 0.2680