Area of a 31 Inch Circle

What is the area of a circle with a DIAMETER of 31 inches (radius of 15.5 inches)? How big is a 31 inch circle?
ft
in
Area of a 31″ diameter circle
754.77square inches
5.2414square feet
0.58238square yards
4,869.5square centimeters
0.48695square 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.

Diameter
Circle Area by Diameter
(results are rounded)
Diameter in2 ft2 cm2
31.0 in 754.8 5.241 4,869
31.1 in 759.6 5.275 4,901
31.2 in 764.5 5.309 4,932
31.3 in 769.4 5.343 4,964
31.4 in 774.4 5.378 4,996
Diameter in2 ft2 cm2
31.5 in 779.3 5.412 5,028
31.6 in 784.3 5.446 5,060
31.7 in 789.2 5.481 5,092
31.8 in 794.2 5.515 5,124
31.9 in 799.2 5.550 5,156