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?

Diameter

meters

Diameter

yards

Units

Area of a 1′ diameter circle

results may be rounded

The area of a circle is pi times the square of its radius. The radius is half the diameter.

Area = π * (Diameter / 2)²

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
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
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