Circumference of a 40 Inch Diameter Circle

What is the circumference of a circle with a diameter of 40 in? How far around is a circle that is 40 inches across?

Diameter

meters

Units

Circumference of a 40″ diameter circle

results may be rounded

The circumference of a circle is pi times its diameter.

Circumference = π * Diameter

The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

Circle Circumference by Diameter

results may be rounded

Diameter	in	ft	cm
40.0 in	125.7	10.47	319.2
40.1 in	126.0	10.50	320.0
40.2 in	126.3	10.52	320.8
40.3 in	126.6	10.55	321.6
40.4 in	126.9	10.58	322.4
40.5 in	127.2	10.60	323.2
40.6 in	127.5	10.63	324.0
40.7 in	127.9	10.66	324.8
40.8 in	128.2	10.68	325.6
40.9 in	128.5	10.71	326.4