# Area of a 45 Inch Circle

What is the area of a circle with a DIAMETER of 45 inches (radius of 22.5 inches)? How big is a 45 inch circle?
Diameter
cm
Diameter
ft
in
Diameter
meters
Diameter
yards
Units
Area of a 45″ diameter circle
 1,590.4 square inches 11.045 square feet 1.2272 square yards 10,261 square centimeters 1.0261 square meters
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 in2 ft2 cm2
45.0 in 1,590 11.04 10,260
45.1 in 1,598 11.09 10,310
45.2 in 1,605 11.14 10,350
45.3 in 1,612 11.19 10,400
45.4 in 1,619 11.24 10,440
45.5 in 1,626 11.29 10,490
45.6 in 1,633 11.34 10,540
45.7 in 1,640 11.39 10,580
45.8 in 1,647 11.44 10,630
45.9 in 1,655 11.49 10,680